Hydraulic device for pulling pin

Abstract

The utility model discloses a hydraulic device for pulling a pin, which relates to the technical field of pin pulling devices and comprises a pin pulling device and a support cylinder arranged on the front side of the pin pulling device. The pin pulling device comprises a cylinder body; a pull rod and a control system for driving the pull rod to slide back and forth are mounted in the cylinder body in a front-back sliding manner; the front end of the pull rod extends out of the cylinder and is connected with a pin; the rear end of the supporting barrel is fixed to the cylinder body, and the pin shaft can penetrate through a center hole of the supporting barrel. After the structure is adopted, when the pin is pulled out, the supporting barrel abuts against a workpiece, the front end of the pull rod extends out of the cylinder body and is connected with the pin shaft, the control system controls the pull rod to slide backwards, and therefore the pin shaft is pulled out of the workpiece, the pin shaft enters the supporting barrel in the pulling-out process, and disassembly of the pin shaft is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pin pulling device technical field, especially a kind of hydraulic device for pulling pin. BACKGROUND

[0002] In coal mine underground mining operation, large hydraulic support is the key equipment for supporting mine roof and ensuring operation safety. Due to its height and weight, the components of hydraulic support need to be connected by large-size and heavy pin shaft. However, when the hydraulic support needs to be lifted for maintenance, the disassembly of these heavy pin shafts becomes a big problem. Manual removal is not only time-consuming and laborious, but also inefficient, and there are safety hazards. SUMMARY

[0003] The utility model aims at providing a kind of hydraulic device for pulling pin, which can efficiently and safely disassemble large pin shaft.

[0004] In order to achieve the above purpose, the utility model provides a kind of hydraulic device for pulling pin, which comprises a pin pulling device and a support cylinder arranged in front of the pin pulling device. The pin pulling device comprises a cylinder body, a pull rod and a control system for driving the pull rod to slide forward and backward are slidably installed in the cylinder body. The front end of the pull rod extends out of the cylinder body and is connected to the pin shaft. The rear end of the support cylinder is fixed on the cylinder body, and the central hole of the support cylinder can allow the pin shaft to enter.

[0005] After adopting the above structure, when pulling the pin, the support cylinder is abutted on the workpiece, the front end of the pull rod extends out of the cylinder body and is connected to the pin shaft, the pull rod is controlled to slide backward by the control system, so as to pull out the pin shaft from the workpiece. The pin shaft enters into the support cylinder during pulling out, so as to realize the disassembly of the pin shaft.

[0006] Preferably, the control system includes a hydraulic system and a locking device; the annular space between the pull rod and the inner wall of the cylinder is provided with an air chamber and a locking chamber from front to back; the hydraulic system is installed in the air chamber, and the locking device is installed in the locking chamber; the hydraulic system includes a sleeve fixed in the air chamber and a piston assembly that is slidably installed in the air chamber, with the pull rod passing through the central hole of the sleeve; the piston assembly includes a piston that is slidably installed in the sleeve and whose outer side is in sealing contact with the peripheral wall of the air chamber, and a piston cylinder fixed to the rear end of the piston and extending rearward out of the air chamber; the piston divides the air chamber into a relatively sealed first air chamber and a second air chamber; two air holes are provided on the side wall of the cylinder, one air hole communicating with the first air chamber and the other air hole communicating with the second air chamber; the locking device includes a clamping head slidably installed on the pull rod, a drive block fixed to the rear end of the piston cylinder, and a compression spring provided between the clamping head and the rear end of the locking chamber; the drive block is provided with a slot for the clamping head to engage; when the clamping head engages in the slot, the clamping head will clamp the pull rod. With this setup, the hydraulic system controls the pull rod to retract, while the locking device locks the pull rod to the hydraulic system, enabling it to retract synchronously with the hydraulic system. The locking device's structure enables a forward-moving pin operation, making pin removal more stable, safer, and smoother.

[0007] Preferably, a push-out spring is provided between the card slot and the clamping head. This structural design prevents the clamping head from being unable to disengage from the card slot after the card slot releases the clamping head.

[0008] Preferably, an observation hole is provided on the side wall of the support cylinder. This structure facilitates the monitoring of the pin-pulling process.

[0009] Preferably, two sets of observation holes are provided: one set located at the front inlet of the support cylinder and the other set located at the rear outlet of the support cylinder. This structure ensures comprehensive observation and facilitates the smooth removal of the pin.

[0010] Preferably, a straightening plate is provided circumferentially at the front inlet position of the support cylinder; the straightening plate forms a flared structure with a larger front diameter and a gradually decreasing rear diameter. This structure guides the pin smoothly into the support cylinder, preventing the pin from deviating or getting stuck during insertion.

[0011] Preferably, the clamping head includes an annular tube sleeved on the pull rod and multiple arc-shaped spring plates disposed at the front end of the annular tube. The multiple arc-shaped spring plates form a conical head structure, and the minimum diameter of the front end of the conical head can be inserted into a slot.

[0012] Preferably, the slot opening is provided with a beveled surface. This structure facilitates the easy ejection of the clamping head from the slot.

[0013] After adopting the above technical solution, the beneficial effects of this utility model are:

[0014] The utility model discloses a hydraulic device for pin pulling solves the technical problem of big labor intensity and insecurity of manual pin pulling in prior art, and the utility model can efficiently and safely dismantle large pin shafts. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structure diagram of the hydraulic device for pin pulling of the utility model;

[0016] Figure 2 It is Figure 1 the front view;

[0017] Figure 3 It is Figure 1 the internal structure diagram;

[0018] Figure 4 It is the structure diagram of the holding head.

[0019] In the drawing, 1, pin pulling device, 11, cylinder body, 12, pull rod, 13, hydraulic system, 131, sleeve, 132, piston, 133, piston cylinder, 14, locking device, 141, holding head, 141-1, annular pipe, 141-2, arc spring piece, 142, driving block, 2, supporting cylinder, 21, observation hole, 22, centralizing piece, 3, pin shaft. DETAILED DESCRIPTION

[0020] The utility model is further described below in combination with the drawings.

[0021] The directions involved in the specification are accurate when the hydraulic device for pin pulling of the utility model works normally, and are not limited to the directions when it is stored and transported, and only represent relative positional relationship and not absolute positional relationship.

[0022] As Figure 1 , Figure 2 and Figure 3 are shown together, a hydraulic device for pin pulling, comprising a pin pulling device 1 and a supporting cylinder 2 arranged on the front side of the pin pulling device 1; the pin pulling device 1 comprises a cylinder body 11, a pull rod 12 and a control system driving the pull rod 12 to slide forward and backward are slidably installed in the cylinder body 11; the front end of the pull rod 12 extends out of the cylinder body 11 and is connected with a pin shaft 3; the rear end of the supporting cylinder 2 is fixed on the cylinder body 11, and the central hole of the supporting cylinder 2 can allow the pin shaft 3 to enter.

[0023] When pulling the pin, the supporting cylinder 2 is abutted against the workpiece, the front end of the pull rod 12 extends out of the cylinder body 11 and is connected with the pin shaft 3, the pull rod 12 is controlled to slide backward by the control system, so that the pin shaft 3 is pulled out of the workpiece, and the pin shaft 3 enters the supporting cylinder 2 during the pulling process, thereby realizing the dismounting of the pin shaft 3.

[0024] The control system can adopt a hydraulic device, such as a hydraulic cylinder, and the output shaft of the hydraulic cylinder is fixed on the pull rod 12, and the extension and retraction of the hydraulic cylinder can realize the pulling out of the pin shaft 3.

[0025] In order to improve the stability of the device, the control system in this embodiment includes a hydraulic system 13 and a locking device 14. The hydraulic system 13 is used to control the backward movement of the pull rod 12, and the locking device 14 is used to lock the pull rod 12 with the hydraulic system 13 to realize the synchronous backward movement of the pull rod 12 with the hydraulic system 13.

[0026] The annular space between the pull rod 12 and the inner side wall of the cylinder body 11 is sequentially provided with an air chamber and a lock chamber from front to back. The hydraulic system 13 is installed in the air chamber, and the locking device 14 is installed in the lock chamber. The hydraulic system 13 includes a sleeve 131 fixed in the air chamber and a piston assembly sealingly and slidingly installed in the air chamber. The pull rod 12 passes through the center hole of the sleeve 131. The piston assembly includes a piston 132 sealingly and slidingly installed on the sleeve 131 and having its outer side in sealing contact with the peripheral wall of the air chamber, and a piston cylinder 133 fixed at the rear end of the piston 132 and extending backward out of the air chamber. The piston cylinder 133 is in sealing contact with the side wall of the air chamber, so that when the piston cylinder 133 moves forward and backward, it does not affect the airtightness of the air chamber. The piston 132 divides the air chamber into relatively sealed first and second air chambers. By injecting or discharging gas or liquid into or out of the first or second air chamber, the piston 132 can be driven to move forward and backward, thereby driving the piston cylinder 133 to move forward and backward.

[0027] The locking device 14 includes a clamping head 141 slidingly installed on the pull rod 12, a driving block 142 fixed at the rear end of the piston cylinder 133, and a compression spring arranged between the clamping head 141 and the rear end of the lock chamber. The driving block 142 is provided with a clamping groove for clamping the clamping head 141. When the piston 132 moves backward, the clamping groove moves backward with the driving block 142, and when the clamping groove moves to a position corresponding to the clamping head 141, the clamping head 141 is clamped into the clamping groove under the action of the compression spring, the pull rod 12 is clamped, and the locking function is realized. When unlocking is needed, the piston 132 is driven forward by the hydraulic system 13, the clamping groove releases the clamping head 141, and the unlocking function is realized.

[0028] In order to avoid the situation that after the clamping groove releases the clamping head 141, the clamping head 141 cannot be pulled out of the clamping groove, a ejection spring is arranged between the clamping groove and the clamping head 141. Under the action of the ejection spring, the clamping head 141 is ejected from the clamping groove, and the unlocking function is realized.

[0029] As Figure 4As shown, the holding head 141 includes an annular tube 141-1 sleeved on the pull rod 12 and a plurality of arc-shaped spring pieces 141-2 arranged at the front end of the annular tube 141-1. The plurality of arc-shaped spring pieces 141-2 form a conical head structure, and the front end of the conical head with the smallest diameter can be inserted into the clamping groove. When the conical head is inserted into the clamping groove, the arc-shaped spring pieces 141-2 are pressed by the clamping groove and shrink inward, holding the pull rod 12. When the clamping groove is separated from the holding head 141, the arc-shaped spring pieces 141-2 restore to the original state under the action of their own elasticity, achieving unlocking.

[0030] In order to facilitate the smooth ejection of the holding head 141 from the clamping groove, the slot position of the clamping groove is provided with an inverted slope. The inverted slope can guide the holding head 141 to smoothly slide out of the clamping groove.

[0031] In order to observe the situation inside the support cylinder 2, an observation hole 21 is formed on the side wall of the support cylinder 2. Two groups of observation holes 21 can be provided, one group is located at the front end entrance position of the support cylinder 2, used for observing whether the pin shaft 3 is completely inserted into the support cylinder 2; the other group is arranged at the rear end exit position of the support cylinder 2, used for observing the distance between the pin shaft 3 and the pin pulling device 1.

[0032] As shown in Figure 3 In order to ensure that the pin shaft 3 can smoothly enter the support cylinder 2, a righting piece 22 is arranged circumferentially at the front end entrance position of the support cylinder 2. The righting piece 22 forms a trumpet structure with a gradually decreasing diameter from the front end to the rear end, which can guide the pin shaft 3 to smoothly enter the support cylinder 2, avoiding the pin shaft 3 from being skewed or jammed during the insertion process.

[0033] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4 The working principle of a hydraulic device for pulling out a pin:

[0034] When pulling out the pin, hydraulic oil is introduced into the first gas chamber, the piston 132 moves backward, driving the driving block 142 to move backward. When the piston 132 moves backward, the driving block 142 drives the clamping groove to move backward. When the clamping groove moves to the position corresponding to the holding head 141, the holding head 141 is clamped into the clamping groove under the action of the compression spring, holding the pull rod 12, achieving the locking function. The holding head 141 drives the pull rod 12 to move out of a stroke; after completing the movement out of a stroke, hydraulic oil is introduced into the second gas chamber, the piston 132 moves forward. At the moment when the piston 132 starts to retreat, the clamping groove releases the holding head 141, achieving the unlocking function; in this way, a plurality of pulling out strokes are repeated, forming a progressive pulling out working process, and finally the pin shaft 3 is completely pulled out from the workpiece.

[0035] Of course, the above description is not a limitation of the utility model, the utility model is also not limited to the above examples, the changes, modifications, additions or replacements made by the person skilled in the art within the essential scope of the utility model should also belong to the protection scope of the utility model.

Claims

1. A hydraulic device for pin extraction, characterized in that: The pin pulling device and the supporting cylinder arranged in front of the pin pulling device are included; The pin pulling device includes a cylinder body, a pull rod and a control system for driving the pull rod to slide forward and backward are slidably arranged in the cylinder body, and the front end of the pull rod extends out of the cylinder body and is connected with a pin shaft; The rear end of the supporting cylinder is fixed on the cylinder body, and the central hole of the supporting cylinder can allow the pin shaft to pass through.

2. A hydraulic device for pin extraction according to claim 1, characterized in that: The control system includes a hydraulic system and a locking device; The annular space between the pull rod and the inner side wall of the cylinder body is sequentially provided with an air chamber and a lock chamber from front to back; the hydraulic system is arranged in the air chamber, and the locking device is arranged in the lock chamber; The hydraulic system includes a sleeve fixed in the air chamber and a piston assembly sealingly and slidably arranged in the air chamber, and the pull rod passes through the central hole of the sleeve; the piston assembly includes a piston sealingly and slidably arranged on the sleeve and in sealing contact with the peripheral wall of the air chamber, and a piston cylinder fixed at the rear end of the piston and extending backward out of the air chamber; the piston divides the air chamber into a first air chamber and a second air chamber in a relatively sealed manner; two air holes are arranged on the side wall of the cylinder body, one of which communicates with the first air chamber, and the other of which communicates with the second air chamber; The locking device includes a clamping head slidably arranged on the pull rod, a driving block fixed at the rear end of the piston cylinder and a compression spring arranged between the clamping head and the rear end of the lock chamber; the driving block is provided with a clamping groove for clamping the clamping head; when the clamping head is clamped into the clamping groove, the clamping head will clasp the pull rod.

3. A hydraulic device for pin extraction according to claim 2, characterized in that: An ejection spring is arranged between the clamping groove and the clamping head.

4. A hydraulic device for pin extraction according to claim 1, characterized in that: An observation hole is arranged on the side wall of the supporting cylinder.

5. A hydraulic device for pin extraction according to claim 4, characterized in that: Two groups of observation holes are arranged, one group is located at the front end entrance position of the supporting cylinder, and the other group is located at the rear end exit position of the supporting cylinder.

6. A hydraulic device for pin extraction according to claim 4, characterized in that: A righting piece is arranged at the front end entrance position of the supporting cylinder in a circumferential direction; the righting piece surrounds a horn structure with a gradually decreasing diameter from the front end to the rear end.

7. A hydraulic device for pin extraction according to claim 2, characterized in that: The clamping head includes an annular tube arranged on the pull rod and a plurality of arc-shaped spring pieces arranged at the front end of the annular tube; the plurality of arc-shaped spring pieces surround a conical head structure, and the front end of the conical head with the smallest diameter can be inserted into the clamping groove.

8. A hydraulic device for pin extraction according to claim 7, characterized in that: An inverted slope is arranged at the notch position of the clamping groove.

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