Quick assembling and locking device for hinge pin shaft

Abstract

The utility model discloses a hinge pin shaft fast-assembly locking device in the technical field of mining machinery, the hinge pin shaft fast-assembly locking device is arranged in a box girder structural member of the mining machinery, the hinge pin shaft fast-assembly locking device comprises a pin seat, a check block, a tension spring and a pin shaft, a round hole for the pin shaft to be inserted is formed in the center of the pin seat, and the check block is arranged in the round hole. A plurality of crescent grooves for containing the check blocks and long-strip grooves for containing the tension springs are annularly formed in the pin base along the periphery of the round hole, long-strip groove inner stoppers are arranged on the inner sides of the long-strip grooves, and every two adjacent check blocks installed in the crescent grooves are tensioned under the action of pre-tightening force of the tension springs and limited through the long-strip groove inner stoppers. The side, close to the round hole, of the check block is an inner conical face, the other side of the check block is a plane, an annular groove matched with the check block is cut in the periphery of the top of the pin shaft, and a conical top is arranged at the top end of the pin shaft. According to the utility model, the original external mounting mode of the stop pin assembly is changed into the built-in structural member box girder mounting mode, so that the damage probability of the stop pin device caused by the use of mining machinery in a severe environment is reduced.

Description

Technical Field

[0001] This utility model relates to a quick-release locking device for hinged pins, belonging to the field of mining machinery technology. Background Technology

[0002] Parts used in mining machinery are typically of a rough-grained grade. Whether in surface or underground mining operations, the components are very heavy and require high-strength box girder structures, such as those used in excavators, crushers, coal mine hydraulic supports, and coal mine scraper conveyors. The box girder structural components of mining machinery are often connected by hinges, using hydraulic jacks to achieve certain non-precise rotational and deflective relative movements. The pins are laterally limited by a retaining pin assembly to prevent them from slipping out during rotation and deflection.

[0003] Traditional stop pin assemblies consist of a cast steel ring, a T-shaped baffle, and a cotter pin (or D-shaped pin). The stop pin is fixed by slotting the ring and installing the cotter pin (or D-shaped pin) on the T-shaped baffle, thus limiting the pin's position. This structure, limited by installation and space constraints, is often placed on the outer side of box girder structural components. Mining machinery operates in harsh environments for extended periods, frequently experiencing stop pin assembly failure and pin detachment. While surface-operating mining machinery can be effectively repaired, repairing stop pin assemblies in underground operations is extremely difficult, especially in coal mines where the unique environment makes repair virtually impossible. Summary of the Invention

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a quick-release locking device for hinged pin shafts. This changes the original method of riveting and welding the external box girder structural components of the retaining pin assembly to the method of installing the internal structural components of the box girder, thereby reducing the probability of damage to the retaining pin device caused by the use of mining machinery in harsh environments.

[0005] To achieve the above objectives, this utility model employs the following technical solution:

[0006] In a first aspect, this utility model provides a quick-release locking device for hinged pins, which is built into the box girder structure of mining machinery. The device includes: a pin seat, a stop block, a tension spring, and a pin. The center of the pin seat is provided with a circular hole for the pin to be inserted. The pin seat is provided with a plurality of crescent grooves for accommodating the stop block and a long groove for accommodating the tension spring along the outer periphery of the circular hole. The long groove is provided with a long groove inner stop. Two adjacent stop blocks installed in the crescent grooves are tightened under the preload of the tension spring and limited by the long groove inner stop. The side of the stop block near the circular hole is an inner conical surface and the other side is a flat surface. The top periphery of the pin is cut with an annular groove that matches the stop block. The top of the pin is provided with a conical top.

[0007] Furthermore, the pin seat is installed on the inner wall of the box girder structure on both sides of the hinge hole position, and is coaxially arranged with the hinge hole.

[0008] Furthermore, the number of the stop block and the tension spring are both two, and they are symmetrically arranged with the circular hole as the center.

[0009] Furthermore, the bottom end of the pin is provided with a threaded hole.

[0010] Furthermore, the outer sides of the elongated groove and the crescent groove are respectively provided with an outer baffle for the elongated groove and an outer baffle for the crescent groove, and the outer baffles for the elongated groove and the outer baffles for the crescent groove are welded and fixed to the inner wall of the box girder structural member.

[0011] Furthermore, the hinged pin quick-release locking device is also installed in other mining machinery structures, including the four-link linkage of hydraulic supports for coal mines and the hinges of each beam, the movable wall of excavators and the bucket hinges.

[0012] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0013] I. This solution changes the original method of riveting and welding the external box girder structural components of the retaining pin assembly to the method of installing the internal structural components of the box girder. This reduces the probability of damage to the retaining pin device caused by the use of mining machinery in harsh environments, improves the reliability and service life of the mining machinery, and reduces the number of pin installation parts, reduces the labor intensity of installation, and improves installation efficiency.

[0014] Second, this solution replaces the long pin shaft in the existing technology with a short pin shaft structure, which can reduce the machining tolerance level of the hinge hole of the mining machinery structural parts, further reduce the machining cost, improve the machining efficiency, and at the same time save the amount of steel used for the pin shaft, further saving costs. Attached Figure Description

[0015] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the "T+gear" structure in the prior art;

[0017] Figure 2 This is a schematic diagram of the "square + block" structural form in the prior art;

[0018] Figure 3 This is a schematic diagram of the structure of a quick-release locking device for a hinged pin provided in Embodiment 1 of this utility model;

[0019] Figure 4This is a schematic diagram of the pin structure of a hinged pin quick-release locking device provided in Embodiment 1 of this utility model;

[0020] Figure 5 This is a schematic diagram illustrating the working principle of a quick-release locking device for a hinged pin provided in Embodiment 1 of this utility model.

[0021] In the diagram: 1. Pin seat; 2. Stop block; 3. Tension spring; 4. Pin shaft; 5. Annular groove; 6. Conical top; 7. Threaded hole; 8. Box girder structural component; 9. Ear seat; 101. Inner stop of long groove; 102. Outer stop of long groove; 103. Outer stop of crescent groove. Detailed Implementation

[0022] like Figure 1 As shown, the most widely used existing stop pin assembly is generally riveted to the outside of the hinged ear plate, adopting a long shaft structure. The long shaft must pass through the four holes of the two ear plates and the hinge of the box girder swing rod. A stop shaft plate is welded to one ear plate, and a circular grooved stop pin seat from the stop pin assembly is welded to the other ear plate. After insertion, a T-shaped baffle is installed into the groove, and a D-shaped pin (which can be replaced by a cotter pin) is installed in the hole at the other end of the T-shaped baffle to fix the T-shaped baffle. From the above technical solution, it can be seen that welding and installing the stop pin assembly on the outside of the hinged ear plate has the following disadvantages:

[0023] (1) The stop pin seat of the stop pin assembly is welded on the outside. Mining machinery is used in complex environments and is easily deformed or detached and fails due to external pressure or impact.

[0024] (2) The T-shaped baffle is fixed with D-shaped pins or cotter pins. It is easy to fall off and fail when squeezed or hit. The T-shaped baffle plate will also fall off, eventually leading to leakage.

[0025] (3) The baffle assembly is assembled with a large gap structure, resulting in relatively high noise during the use of mining machinery;

[0026] (4) The baffle assembly is exposed to harsh environment and is prone to corrosion. Over time, this makes it difficult to disassemble and maintain the mining machinery. During maintenance, destructive disassembly is often used.

[0027] (5) This structure has high requirements for the coaxiality accuracy of the hinge holes, and the processing requirements and installation labor intensity are high.

[0028] Existing technology two Figure 2 As shown, this structure has many similarities to the prior art. In the stop pin assembly, the stop pin plate is a square structure with two slots for installing the square stop pin inside. An annular groove for accommodating the square stop pin is also required on the hinge shaft. In use, the square stop pin plate is also welded to the outside of the ear plate. After the square stop pin passes through the square stop pin plate, it is fixed with a cotter pin.

[0029] In addition to the disadvantages of prior art 1, prior art 2 also increases the number of parts and the amount of machining, and the strength of the cotter pin is much lower than that of the D-pin, making it more prone to failure. When riveting the square stop pin plate, the coaxiality requirement between it and the hinge hole is even higher; otherwise, the square stop pin is difficult to install, further increasing the machining cost of the riveted and welded structural parts.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0031] The following detailed description is exemplary and intended to provide further detailed explanation of the present invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this invention.

[0032] Example:

[0033] This solution provides a quick-release locking device for hinged pins and its application method, such as... Figure 3 As shown, the hinged pin quick-release locking device consists of a pin seat 1, a stop block 2, a tension spring 3, and a pin 4. The pin seat 1 is formed by die forging, with a circular hole in the center for inserting the pin 4. The pin seat 1 is machined into a crescent groove to accommodate the stop block 2 and a long groove for the tension spring 3. The two stop blocks 2 are installed in the crescent groove of the pin seat 1 and connected by two tension springs 3. The two tension springs 3 are installed in the long groove of the pin seat 1, and the two stop blocks 2 are firmly fixed in the pin seat 1 and limited by the preload. It should be noted that the inner and outer sides of the long groove are provided with an inner groove stop 101 and an outer groove stop 102. The inner groove stop 101 is used to abut the stop block 2 to prevent it from moving further inward. The long groove outer stop 102 provides external protection for the tension spring 3, and the crescent groove outer stop 103 provides external protection for the stop block 2. In addition, before the use of the hinge pin quick-release locking device, it needs to be pre-installed in the box girder structural component 8 of the mining machinery by means of welding, threaded connection, etc. The long groove outer stop 102 and the crescent groove outer stop 103 are also the installation connection points of the pin seat 1 in the box girder structural component 8. The coaxiality of the hinge pin quick-release locking device and the hinge hole of the box girder structural component 8 can be controlled within ±3mm to meet the installation requirements.

[0034] In this design, the box girder structural component 8 of the mining machinery incorporates a quick-release locking device with hinged pins. The structure of pin 4 has also been changed, from a long pin with four hinge holes to a short pin with two hinge holes. Figure 5As shown, the pin 4 has an annular groove 5 on the top periphery of the quick-release locking device for the hinged pin, and one end of the pin 4 with the annular groove 5 is provided with a conical top 6 to facilitate the insertion of the pin 4. It should be noted that one side of the stop block 2 is a flat surface and the other side is an inner conical surface, with the flat surface facing the direction of pin 4 insertion. During the insertion of the pin 4, when the conical top 6 of the pin 4 contacts the flat surface of the stop block 2, the two stop blocks 2 are resisted by the horizontal force of the conical surface of the conical top 6. Gradually move away until the conical top 6 is fully inserted into the hinge pin quick-release locking device. At this time, the stop blocks 2 are pulled closer to each other by the inward pulling force of the tension spring 3 and abut against the annular groove 5. During the process of pulling out the pin 4, when the conical top 6 of the pin 4 comes into contact with the inner conical surface of the stop block 2, the two stop blocks 2 are gradually moved away from each other by the horizontal resistance force of the cross section of the annular groove 5 against the inner conical surface, until the conical top 6 is completely pulled out of the hinge pin quick-release locking device. The stop blocks 2 return to their original position by the inward pulling force of the tension spring 3.

[0035] When the box girder structural component 8 of the mining machinery is hinged to the lug 9, the hinge hole with the built-in hinge pin quick-release locking device is aligned with the hinge hole of the lug 9. The pin 4 is passed through the hinge hole of the lug 9 and inserted into the hinge hole of the box girder structural component 8. One end of the pin 4, which is designed with a conical top 6, contacts the stop block 2 inside the hinge pin quick-release locking device. When the pin 4 is pushed further, the conical top 6 pushes the stop block 2 and overcomes the tension of the two tension springs 3, causing the stop block 2 to slide in the crescent groove of the pin 4. When the conical top 6 of the pin 4 has completed its stroke, the pin 4 is pushed further, so that the annular groove 5 of the pin 4 approaches the stop block 2 inside the hinge pin quick-release locking device. Under the tension of the tension springs 3, the two stop blocks 2 are reset and locked in the annular groove 5. Since the pin 4 with the conical top 6 is built into the housing and is not subjected to axial force, there is no possibility of the pin 4 automatically disengaging. When the pin 4 needs to be pulled out, the other end of the pin 4 is designed with a threaded hole 7. A suitable bolt is inserted into the threaded hole 7, and the pin 4 is pulled outward. One section of the annular groove 5 of the pin 4 contacts the inner conical surface of the stop block 2, and pushes the stop block to overcome the tension of the tension spring 3, so that the pin 4 can be pulled out.

[0036] This solution changes the original method of riveting and welding the external box girder structural components of the retaining pin assembly to an internal box girder installation method. This reduces the probability of damage to the retaining pin device caused by the use of mining machinery in harsh environments, improving the reliability and service life of the mining machinery. Furthermore, this solution reduces the number of pin installation parts, lowers installation labor intensity, and improves installation efficiency. In addition, this solution replaces the long pins in the existing technology with short pin structures, which can reduce the machining tolerance level of the hinge holes in the mining machinery structural components, reduce noise, further reduce processing costs, improve processing efficiency, and save steel consumption for the pins, further saving costs. It should be noted that this solution can be widely applied to similar structures in mining machinery, such as the four-link linkage and hinged beams of hydraulic supports in coal mines, the movable walls of excavators, and the hinged buckets.

[0037] As is known from common technical knowledge, this utility model can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A hinged pin quick-release locking device, characterized in that, The hinged pin quick-release locking device is built into the box girder structure (8) of the mining machinery. The device includes a pin seat (1), a stop block (2), a tension spring (3) and a pin (4). The center of the pin seat (1) is provided with a circular hole for the pin (4) to be inserted. The pin seat (1) is provided with a plurality of crescent grooves for accommodating the stop block (2) and a long groove for accommodating the tension spring (3) along the outer periphery of the circular hole. The long groove is provided with a long groove inner stop (101). Two adjacent stop blocks (2) installed in the crescent groove are tightened under the preload of the tension spring (3) and limited by the long groove inner stop (101). The side of the stop block (2) near the circular hole is an inner conical surface and the other side is a flat surface. The top periphery of the pin (4) is cut with an annular groove (5) that matches the stop block (2). The top of the pin (4) is provided with a conical top (6).

2. The hinged pin quick-release locking device according to claim 1, characterized in that, The pin seat (1) is installed on the inner wall of the box at the hinge hole position on both sides of the box girder structural component (8) of the mining machinery, and is coaxial with the hinge hole.

3. The hinged pin quick-release locking device according to claim 1, characterized in that, The number of the stop block (2) and the tension spring (3) are both two, and they are symmetrically arranged with the round hole as the center.

4. The hinged pin quick-release locking device according to claim 1, characterized in that, The bottom end of the pin (4) is provided with a threaded hole (7).

5. The hinged pin quick-release locking device according to claim 1, characterized in that, The outer sides of the elongated groove and the crescent groove are respectively provided with an outer baffle (102) for the elongated groove and an outer baffle (103) for the crescent groove, and the outer baffle (102) for the elongated groove and the outer baffle (103) for the crescent groove are welded and fixed to the inner wall of the box girder structural member (8).

6. The hinged pin quick-release locking device according to claim 1, characterized in that, The hinged pin quick-release locking device is also installed in other mining machinery structures, including the four-link hydraulic support for coal mines and the hinged connections of each beam, the movable wall of the excavator and the bucket hinge.

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