Proportional valve maintenance tool

Abstract

The utility model relates to the technical field of proportional valve maintenance, in particular to a proportional valve maintenance tool. Comprising needle-nose pliers, and two clamping parts of the needle-nose pliers are detachably and fixedly sleeved with expansion heads. The expansion head comprises an arc-shaped plate, a fixing plate is fixed to one end of the arc-shaped plate, the clamping portion of the needle-nose pliers is inserted between the fixing plate and the arc-shaped plate, a fixing rod is fixed to the fixing plate, clamping teeth matched with tooth grooves in the inner side of the clamping portion of the needle-nose pliers in a clamped mode are machined on the fixing rod, and the fixing rod is fixedly connected with the clamping portion of the needle-nose pliers through a hoop. According to the tool, the clamping parts of the nipper pliers are detachably and fixedly sleeved with the expansion heads, the arc-shaped plates on the expansion heads stretch into the position between the valve element and the valve body, when the nipper pliers enable the two clamping parts to be closed, the two arc-shaped plates are close to each other and enter to clamp the valve element, then the nipper pliers are pulled in the direction away from the valve body, and the valve element can be pulled out of the valve body; the maintenance or repair efficiency of the proportional valve can be improved.

Description

Technical Field

[0001] This utility model relates to the field of proportional valve repair technology, specifically to a proportional valve repair tool. Background Technology

[0002] A proportional valve is a type of hydraulic valve that converts an input electrical signal into force or displacement proportionally, thereby continuously controlling parameters such as pressure and flow rate.

[0003] Currently, the applicant company uses a large number of Rexroth proportional valves on its paper machines. During the use of the oil, under high temperature and pressure, the internal hydrocarbons oxidize to form a varnish film, which is the main reason for the frequent valve jamming. In order to reduce the impact of valve jamming on production, it is necessary to disassemble the proportional valves regularly to clean the valve cores. Because the valve core and valve seat have a very high precision fit, and the disassembly resistance increases after the valve core forms a varnish film, the disassembly process is time-consuming and laborious and can easily scratch the valve core, which greatly restricts the precision of equipment installation and maintenance.

[0004] In the prior art, patent document CN207139689U discloses a valve core bushing extractor, which includes: a force-applying clamp, the force-applying clamp including a first clamp handle and a second clamp handle, the first end of the first clamp handle and the first end of the second clamp handle are both force-applying ends, the first clamp handle and the second clamp handle are hinged, the second end of the first clamp handle is provided with a first cutting edge, the second end of the second clamp handle is provided with a second cutting edge, the first cutting edge and the second cutting edge are respectively used to cut into the joint between the bottom of the valve core and the bottom of the bushing.

[0005] The patent document with publication number CN209095370U discloses a lifting check valve core removal tool, which includes a left clamp body, a right clamp body, a rivet, a clamping block and a spring plate;

[0006] The left and right clamps are each provided with a clamping block on the outer side of their tips. The clamping block is in the shape of a boss, and the size of the boss matches the size of the guide hole of the check valve core.

[0007] The left and right clamps are hinged together and fixed at the hinge with rivets, forming a dynamic fit.

[0008] When the ends of the left and right clamps are clamped, the clamping blocks at the tips of the clamps are pushed outward by the lever action and come into contact with the guide hole of the check valve core.

[0009] After the valve cover of a Rexroth proportional valve is removed, there is no place to apply force inside the valve core. There is only a small space between the outer edge of the valve core and the valve body. Therefore, neither of the above two techniques is suitable for removing the valve core of a Rexroth proportional valve. Utility Model Content

[0010] The main purpose of this utility model is to provide a maintenance tool that facilitates the removal of the valve core of a proportional valve and improves the maintenance efficiency of proportional valves.

[0011] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0012] A proportional valve repair tool includes needle-nose pliers. An extension head is detachably fitted and fixed to both clamping parts of the needle-nose pliers. The extension head includes an arc-shaped plate, and a fixing plate is fixed to one end of the arc-shaped plate. The clamping part of the needle-nose pliers is inserted between the fixing plate and the arc-shaped plate. A fixing rod is fixed to the fixing plate. The fixing rod is machined with teeth that engage with the tooth grooves on the inner side of the clamping part of the needle-nose pliers. The fixing rod and the clamping part of the needle-nose pliers are fixedly connected by a clamp.

[0013] Specifically, the lower inner side of the arc-shaped plate is provided with a lower arc-shaped groove for accommodating the valve core.

[0014] Specifically, an upper arc-shaped groove is provided in the middle of the inner side of the upper end of the arc-shaped plate, and the outer side of the needle-nose pliers clamping part is inserted into the upper arc-shaped groove.

[0015] Specifically, an inner groove is provided on the end face of the clamping part of the needle-nose pliers on the side away from the fixing rod, and an outer groove is provided on the side of the clamping part of the needle-nose pliers away from the fixing rod. The clamp is located in the outer groove and the inner groove.

[0016] Specifically, the extension head is made of high-strength steel.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] 1. This tool features a removable extension head attached to the clamping part of needle-nose pliers. The arc-shaped plate on the extension head extends between the valve core and the valve body. When the two clamping parts of the needle-nose pliers are closed, the two arc-shaped plates move closer together to clamp the valve core. Then, by pulling the needle-nose pliers away from the valve body, the valve core can be pulled out of the valve body, which can improve the maintenance or repair efficiency of proportional valves.

[0019] 2. The extension head can be separated from the clamping part of the needle-nose pliers, making it easy to replace extension heads of different specifications. It can be conveniently used for the repair or maintenance of proportional valves of different specifications.

[0020] 3. The fixing rod is machined with a locking tooth that engages with the tooth groove on the inside of the needle-nose pliers clamping part. When the needle-nose pliers are pulled away from the valve body, the extension head can be prevented from separating from the clamping part of the needle-nose pliers.

[0021] 4. By setting inner and outer slots, the stability of the clamp can be guaranteed, preventing the clamp from falling off the clamping part of the needle-nose pliers. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the tool.

[0023] Figure 2 for Figure 1 Sectional view along line AA.

[0024] Figure 3 This is a schematic diagram of the outer slot on the gripping part of the needle-nose pliers.

[0025] Figure 4 This is a schematic diagram of the extension head.

[0026] The parts in the attached diagram are named as follows: 1. Needle-nose pliers, 2. Curved plate, 3. Fixing plate, 4. Fixing rod, 5. Lower curved groove, 6. Clamp, 7. Outer groove, 8. Inner groove, 9. Clamping teeth, 10. Upper curved groove. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example 1: Refer to Figures 1-4 As shown, a proportional valve repair tool includes needle-nose pliers 1, with an extension head detachably fitted and fixed to both clamping parts of the needle-nose pliers 1. The extension head is made of high-strength steel.

[0029] The extension head includes an arc-shaped plate 2, with a fixing plate 3 fixed at one end of the arc-shaped plate 2. The clamping part of the needle-nose pliers 1 is inserted between the fixing plate 3 and the arc-shaped plate 2. An upper arc-shaped groove 10 is provided in the middle of the inner side of the upper end of the arc-shaped plate 2, and the outer side of the clamping part of the needle-nose pliers 1 is inserted into the upper arc-shaped groove 10.

[0030] A fixing rod 4 is fixed on the fixing plate 3. The fixing rod 4 is machined with a cleat 9 that engages with the tooth groove on the inside of the clamping part of the needle-nose pliers 1. The fixing rod 4 and the clamping part of the needle-nose pliers 1 are fixedly connected by a clamp 6.

[0031] By setting the upper arc groove 10, the contact area between the arc plate 2 and the clamping part of the needle-nose pliers 1 can be increased. After the clamp 6 fixes the clamping part of the needle-nose pliers 1 and the fixing rod 4, the stability of the arc plate 2 can be improved.

[0032] The lower inner side of the arc plate 2 is provided with a lower arc groove 5 for accommodating the valve core.

[0033] In use, the two clamping parts of the needle-nose pliers 1 are moved apart, causing the two extension heads to move away from each other. Then, the two arc-shaped plates 2 are inserted into the gap between the valve core and the valve body, bringing the two clamping parts of the needle-nose pliers 1 closer together. The valve core is then positioned within the lower arc-shaped groove 5 of the two arc-shaped plates 2, which clamp the valve core. The needle-nose pliers 1 are then pulled away from the valve body, and the valve core can be pulled out of the valve body under the clamping action of the two arc-shaped plates 2.

[0034] The extension head can be separated from the clamping part of the needle-nose pliers 1, making it easy to replace extension heads of different specifications. It can be conveniently used for the repair or maintenance of proportional valves of different specifications.

[0035] The fixing rod 4 is machined with a locking tooth 9 that engages with the tooth groove on the inner side of the clamping part of the needle-nose pliers 1. When the needle-nose pliers 1 is pulled away from the valve body, it can prevent the expansion head from separating from the clamping part of the needle-nose pliers 1.

[0036] The curvature of the lower arc groove 5 can be machined according to the valve core diameter of the proportional valve to ensure that after the two arc plates 2 clamp the valve core, the groove wall of the lower arc groove 5 fits with the outer edge of the valve core, thereby increasing the contact area between the arc plate 2 and the valve core, and thus increasing the friction force after the arc plate 2 clamps the valve core, ensuring that the valve core can be effectively pulled out of the valve body.

[0037] The two ends of the clamp 6 are connected by bolts. Rotating the bolts can make the clamp 6 tighten the clamping part of the needle-nose pliers 1 and the fixing rod 4.

[0038] Example 2: Based on Example 1, referring to... Figure 3 and Figure 4 As shown, an inner groove 8 is provided on the end face of the clamping part of the needle-nose pliers 1 away from the fixed rod 4, and an outer groove 7 is provided on the side of the clamping part of the needle-nose pliers 1 away from the fixed rod 4. The clamp 6 is located in the outer groove 7 and the inner groove 8.

[0039] By setting the inner slot 8 and the outer slot 7, the stability of the clamp 6 can be guaranteed, and the clamp 6 can be prevented from falling off the clamping part of the needle-nose pliers 1.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A proportional valve repair tool, comprising needle-nose pliers (1), characterized in that, Both clamping parts of the needle-nose pliers (1) are detachably fitted with extension heads; the extension head includes an arc plate (2), one end of which is fixed with a fixing plate (3), the clamping part of the needle-nose pliers (1) is inserted between the fixing plate (3) and the arc plate (2), a fixing rod (4) is fixed on the fixing plate (3), and a locking tooth (9) is machined on the fixing rod (4) to engage with the tooth groove on the inner side of the clamping part of the needle-nose pliers (1), and the fixing rod (4) is fixedly connected to the clamping part of the needle-nose pliers (1) by a clamp (6).

2. The proportional valve repair tool according to claim 1, characterized in that, The lower inner side of the arc plate (2) is provided with a lower arc groove (5) for accommodating the valve core.

3. The proportional valve repair tool according to claim 1, characterized in that, The upper arc-shaped plate (2) has an upper arc-shaped groove (10) in the middle of the inner side of the upper end, and the outer side of the clamping part of the needle-nose pliers (1) is inserted into the upper arc-shaped groove (10).

4. The proportional valve repair tool according to claim 1, characterized in that, The fixing rod (4) has an inner groove (8) on the end face of the clamping part of the needle-nose pliers (1) away from it, and an outer groove (7) is provided on the side of the clamping part of the needle-nose pliers (1) away from the fixing rod (4). The clamp (6) is located in the outer groove (7) and the inner groove (8).

5. A proportional valve repair tool according to claim 1, characterized in that, The extension head is made of high-strength steel.

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