Product Description

Quick couplers (also called quick hitches) are used with construction machines to allow the rapid change of buckets and attachments on the machine. They remove the need to use hammers to manually drive out and insert the mounting pins for attachments. They can be used on excavator, mini excavator, backhoe loader and so on.

We can supply 3 type: hydraulic type, Double lock type and Mechanical type.

                                                                                      Multi-quick hitch

Multi-Quick Coupler Specification
Model	Unit	RQH01D(a)	RQH01D(b)	RQH02D	RQH04D	RQH06D	RQH08D	RQH10D(a)	RQH10D(b)
Carrier Weight	T	1~2	2~4	4~6	6~8	10~15	15~27	25~32	30~36
Pin Diameter	mm	30	35/40	45	50/55	60/65	70/80	90	90/100
Arm Width(W1)	mm	105~125	110~135	140~180	185~220	220~270	300-340	350~390	390~420
Center To Center(A1)	mm	120~140	140~215	185~290	260~320	340~430	380~490	460~530	480~550
Equipping Distance(A2)	mm	120~140	140~215	185~290	260~320	340~430	380~490	460~530	480~550
Up and Down pin  center distance(H1)	mm	125	125	165-175	200	245	275	315
Working Pressure	Bar	40~248	40~248	40~248	40~205	40~205	40~205	40~205	40~205
Oil Flow	L/min	10~20	10~20	10~20	10~20	10~20	10~20	10~20	10~20
Unit Weight	Kg	20	23.5	51-80	110	185	340	500
Unit Length	mm	370	400	505-610	655	820	980	1060
Unit Width	mm	220	240	275-330	312	440	510	560
Unit High	mm	210	210	265-320	335	410	490	560
Lifting Eye Rating	T	1	1	2-3	4	5	8

We can also product hydraulic type and double lock type.

Advantages:

1. Welding Technique: 17 years experience, full welding and not easy to crack.

2. Grease Nipple: Make pin not easy to wear

3. Double Lock System: Front jaw lock and Rear safety lock make the operation much safer. Which embrace the pins tightly even if the cylinder suddenly inoperation.

4. Imported oil cylinder and not easy to damage

5. Without safety pin and excavator operator can operate  it in the cab alone.

6. Wide range of application: Compared with fixed C to C distance(A) of routine quick hitch,  multi quick hitch is more flexible. It is suitable for all attachments with the C to C distance(A) within its range. 

1. Open the cylinder, and ensure slide is fully extended with front jaw safety lock open.

2. Line up attachments and engage front attachments pin.

3. Close the cylinder. This will retract the slide mechanism and this will visibly lock the front jaw safety latch around front attachment pin.

4. Open the cylinder again. The sliding mechanism will extend and engage the rear slide hook CHINAMFG the rear attachment pin.

5. Proceed with connection test.

 

RAY ATTACHMENTS includes HangZhou CHINAMFG International Trading Company and HangZhou CHINAMFG Precision Machinery Co.,Ltd. It is a Integrated Company dedicated to production, research and development and sales of construction machinery attachments.with 17 years experience. The main products include earth auger, quick hitch, hydraulic breaker, vibro ripper and other heavy duty equipment. Our company covers an area of more than 20000 square CHINAMFG and has more than 150 employees, including professional R & D teams and Sales Department. Welcome to visit!

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Can hydraulic couplings be used in applications involving corrosive or aggressive fluids?

Yes, hydraulic couplings can be used in applications involving corrosive or aggressive fluids, but the choice of materials and design considerations is critical to ensure compatibility and long-term performance. Corrosive fluids, such as acids, alkalis, and certain chemicals, can pose significant challenges to hydraulic systems. Here are some key factors to consider when using hydraulic couplings in such applications:

• Material Selection: Choose hydraulic couplings made from materials that are resistant to the specific corrosive fluid being handled. Stainless steel, certain alloys, and corrosion-resistant coatings are common choices for couplings in corrosive environments.
• Sealing Solutions: Ensure that the couplings have effective sealing solutions to prevent fluid leakage. High-quality seals and gaskets that are compatible with the corrosive fluid are essential to maintain system integrity.
• Chemical Compatibility: Thoroughly assess the chemical compatibility between the hydraulic fluid and the coupling materials. Consider the fluid’s temperature, concentration, and potential reactions with the coupling components.
• Special Coatings: In some cases, using hydraulic couplings with specialized coatings or treatments can enhance their resistance to corrosion and aggressive fluids.
• Regular Inspection and Maintenance: Implement a stringent inspection and maintenance schedule to monitor the condition of the hydraulic couplings and detect any signs of corrosion or degradation. Promptly replace any damaged or worn couplings to prevent fluid leaks and system failure.
• Fluid Contamination: Corrosive fluids can lead to the formation of contaminants in the hydraulic system. Implement effective filtration and contamination control measures to prevent particle buildup and system damage.
• Operating Conditions: Consider the temperature, pressure, and flow conditions of the system, as these factors can impact the corrosion resistance of the couplings and the overall system performance.

While hydraulic couplings can be used in corrosive or aggressive fluid applications, it is essential to consult with coupling manufacturers or fluid system experts to ensure proper material selection and system design. They can provide guidance on selecting the most suitable hydraulic couplings and recommend additional measures to protect the system from the adverse effects of corrosive fluids.

By employing the right materials, adopting proper maintenance practices, and taking the necessary precautions, hydraulic couplings can effectively function in applications involving corrosive or aggressive fluids, providing reliable and safe fluid power transmission.

What are the standard sizes and thread types available for hydraulic couplings?

Hydraulic couplings come in a variety of sizes and thread types to accommodate different hydraulic system requirements. The standard sizes and thread types are specified based on industry standards and regional norms. Here are some common standard sizes and thread types for hydraulic couplings:

• Thread Types:
  • NPT (National Pipe Thread): NPT is a widely used thread type in North America. It has a tapered thread design and requires thread sealants like Teflon tape to ensure a leak-free connection.
  • BSP (British Standard Pipe): BSP is commonly used in Europe and many other parts of the world. It can have parallel (BSPP) or tapered (BSPT) threads and often requires thread sealants for a secure connection.
  • JIC (Joint Industry Council): JIC threads have a 37-degree flare angle and are prevalent in hydraulic systems. They provide a reliable metal-to-metal seal without the need for thread sealants.
  • SAE (Society of Automotive Engineers): SAE threads are commonly used in mobile hydraulic applications. They have a 45-degree flare angle and offer excellent sealing capabilities.
  • ORFS (O-Ring Face Seal): ORFS fittings feature a flat face with an O-ring seal. They are suitable for high-pressure applications and provide a reliable leak-free connection.
• Standard Sizes:
  • Hydraulic couplings are available in various standard sizes, typically measured in inches or millimeters. Common sizes for hydraulic couplings include 1/4″, 3/8″, 1/2″, 3/4″, 1″, and 1 1/4″ for smaller couplings and up to larger sizes like 2″, 2 1/2″, and 3″ for heavy-duty industrial applications.
  • Metric sizes, such as 6 mm, 10 mm, 12 mm, 16 mm, and 20 mm, are also commonly used in hydraulic systems, especially in countries that follow the metric system.
  • Some specialized hydraulic systems may require custom sizes to meet specific application needs.

It’s important to note that while these thread types and sizes are commonly used, there may be other proprietary or industry-specific thread types and sizes depending on the manufacturer or application requirements. When selecting hydraulic couplings, it’s essential to ensure that the chosen couplings match the thread type and size of the corresponding components in the hydraulic system to ensure a proper and secure connection.

Hydraulic coupling manufacturers often provide detailed specifications and technical information about their products, including the available thread types and sizes, to help users select the right couplings for their specific hydraulic system needs.

Can you explain the working principle of a hydraulic coupling and its advantages over other coupling types?

A hydraulic coupling operates based on the principle of hydraulic fluid transmission to transfer power from one shaft to another. It consists of two main parts: the input (driving) element and the output (driven) element, both of which have specially designed vanes or blades submerged in hydraulic fluid.

When the input element rotates, it creates a flow of hydraulic fluid around the vanes. The fluid flow generates pressure on the output element, causing it to start rotating. This pressure difference between the input and output elements facilitates the transfer of torque and power from the driving shaft to the driven shaft.

The working principle of a hydraulic coupling allows it to accommodate misalignments and torsional vibrations. It effectively isolates shock loads, provides overload protection, and dampens vibrations, making it ideal for various industrial applications.

Advantages of hydraulic couplings over other coupling types include:

1. Misalignment Tolerance: Hydraulic couplings can handle significant shaft misalignments, reducing wear and tear on the system and prolonging the life of the components. Other coupling types may have limitations in this regard.
2. Vibration Damping: Hydraulic couplings can effectively dampen vibrations, preventing damage to connected equipment and promoting smoother operation. This advantage is especially critical in precision machinery and applications where vibrations can affect accuracy and performance.
3. Overload Protection: Hydraulic couplings offer built-in overload protection. When the torque exceeds a certain threshold, the fluid coupling slips or disengages, preventing damage to the system and its components. Other coupling types may not have this automatic overload protection.
4. Smooth Start-up: Hydraulic couplings provide gradual power transmission during start-up, which helps minimize shock and stress on the system. This feature is beneficial for systems with heavy loads or delicate components.
5. Quiet Operation: Due to their vibration-damping properties, hydraulic couplings contribute to quieter operation, reducing noise levels in the machinery compared to some other coupling types.
6. Wide Range of Applications: Hydraulic couplings are suitable for a wide range of industrial applications, including heavy machinery, mining equipment, conveyors, pumps, and more. Their adaptability and robust performance make them a popular choice in various industries.

While hydraulic couplings offer many advantages, the selection of the appropriate coupling type ultimately depends on the specific requirements of the application, such as torque, speed, misalignment, and environmental conditions. Properly choosing and maintaining the coupling can significantly improve the efficiency, reliability, and overall performance of fluid power transmission systems in industrial settings.

editor by CX 2024-02-09