Compensation sleeve insertion and extraction auxiliary tool and compensation sleeve extraction method

Abstract

The compensation sleeve insertion and extraction auxiliary tool is used when a compensation sleeve of a valve of a hydraulic elevator is inserted or extracted. A compensation sleeve insertion / extraction aid is provided with: a connection member having one end side connected to the top surface of a compensation sleeve and the other end side extending in the extraction direction of the compensation sleeve; a plate member connected to the other end side of the connecting member and having an active surface portion extending in a direction intersecting the pulling-out direction; a fulcrum member provided to protrude from the housing mating surface in the pull-out direction; and an operation member having a distal end portion in contact with the acting surface portion of the plate member as an acting point, an intermediate portion in contact with the fulcrum member as a fulcrum, and a base end portion as a force point to be operated by a worker.

Description

Technical Field

[0001] The present disclosure relates to a technique for pulling out or inserting a compensation sleeve of a valve of a hydraulic elevator. Background Art

[0002] Patent Document 1 discloses a sleeve pulling-out device. The sleeve pulling-out device includes a rod-shaped member. A tap portion that forms an internal thread on the inner wall of the sleeve by meshing with and rotating on the inner wall of the sleeve is provided on the rod-shaped member. Therefore, by rotating the rod-shaped member while inserting it into the inside of the sleeve, the tap portion provided on the rod-shaped member is threadedly engaged with the sleeve. By pulling out the rod-shaped member coupled to the sleeve from the object, the sleeve pressed into the object is also pulled out from the object.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2018-20387 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] Sometimes, maintenance is performed on the valve of a hydraulic elevator. In the maintenance of the valve, there is an operation of pulling out the compensation sleeve from the valve. In this operation, as in the technique of Patent Document 1, after screwing a component such as a screw into the compensation sleeve, the screw and the compensation sleeve are pulled out together. However, sometimes it is difficult to perform the operation of pulling out the compensation sleeve that is firmly pressed in, and it may be a heavy operation for the operator. This is also the case for the operation of inserting the compensation sleeve into the valve.

[0008] The present disclosure has been completed to solve the above problems, and an object thereof is to provide an auxiliary tool for inserting and pulling out a compensation sleeve and a method for pulling out a compensation sleeve, which can reduce the burden on the operator in the operation of pulling out or inserting the compensation sleeve of the valve of a hydraulic elevator.

[0009] Means for Solving the Problems

[0010] The present disclosure is an auxiliary tool for inserting and pulling out a compensation sleeve, which is used to pull out the compensation sleeve from a sleeve hole provided on the housing mating surface of the valve of a hydraulic elevator. The auxiliary tool for inserting and pulling out a compensation sleeve includes: a connecting member, one end side of which is connected to the top surface of the compensation sleeve, and the other end side extends in the pulling-out direction of the compensation sleeve; a plate member, which is connected to the other end side of the connecting member and has an acting surface portion extending in a direction intersecting the pulling-out direction; a fulcrum member, which is provided to protrude from the housing mating surface in the pulling-out direction; and an operating member, the end portion of which contacts the acting surface portion of the plate member as an acting point, the middle portion of which contacts the fulcrum member as a fulcrum, and the base end portion of which is operated by the operator as a force point.

[0011] In addition, the present disclosure is a method for pulling out a compensation sleeve, which is used to pull out a compensation sleeve from a sleeve hole provided on a housing mating surface of a valve of a hydraulic elevator by using an auxiliary tool for inserting and pulling out the compensation sleeve. The auxiliary tool for inserting and pulling out the compensation sleeve includes: a fulcrum bolt; a connecting bolt having a threaded portion formed at one end side and a head having a diameter larger than that of the threaded portion formed at the other end side; a plate member having an acting surface formed with a through hole having a diameter larger than that of the threaded portion and smaller than that of the head; and an operating member operated by an operator. The method for pulling out the compensation sleeve includes: a first step of screwing the fulcrum bolt into a threaded hole provided on the housing mating surface; a second step of screwing the connecting bolt into a threaded hole provided on the top surface of the compensation sleeve in a state of being inserted through the through hole, so as to form a gap between the acting surface and the top surface; a third step of adjusting the screwing amounts of the fulcrum bolt and the connecting bolt; and a fourth step of using the end portion as an acting point to contact the acting surface of the plate member, using the middle portion as a fulcrum to contact the fulcrum bolt, and applying a force to the base end portion toward the housing mating surface side.

[0012] Advantages of the Invention

[0013] According to the auxiliary tool for inserting and pulling out the compensation sleeve of the present disclosure, a lever for pulling the compensation sleeve in the pulling-out direction can be formed by a connecting member, a plate member, a fulcrum member, and an operating member. Thus, even a compensation sleeve that is firmly pressed in can be pulled out with a small force. As a result, the burden on the operator is reduced. Description of the Drawings

[0014] Figure 1 It is a view showing an external structure of a valve of the auxiliary tool for inserting and pulling out according to the application embodiment.

[0015] Figure 2 It is a view for explaining a component structure of the auxiliary tool for inserting and pulling out the compensation sleeve.

[0016] Figure 3 It is a view showing an installation example of the auxiliary tool for inserting and pulling out the compensation sleeve according to the embodiment.

[0017] Figure 4 It is an enlarged view showing an installation example of the auxiliary tool for inserting and pulling out the compensation sleeve according to the embodiment.

[0018] Figure 5 It is a view showing an operation example of the auxiliary tool for inserting and pulling out the compensation sleeve according to the embodiment. Detailed Embodiment

[0019] Hereinafter, the embodiment will be described with reference to the drawings. In addition, the same reference numerals are given to the elements common to the respective drawings, and redundant descriptions are omitted.

[0020] Embodiment

[0021] 1. Appearance Structure of the Valve Using the Compensating Sleeve Insertion / Extraction Assist Tool of the Embodiment

[0022] Figure 1 FIG. is a view showing the appearance structure of the valve of the insertion / extraction assist tool of the embodiment. The valve 10 shown in this figure is a device for controlling the hydraulic pressure of a hydraulic elevator. On one side surface of the valve 10, a housing 12 is mounted by six mounting bolts 14. The compensating sleeve 16 is an internal structural component of the valve 10. When the housing 12 is removed, the top surface of the compensating sleeve 16 inserted into the sleeve hole is exposed. In the following description, the direction of pulling out the compensating sleeve 16 from the sleeve hole is referred to as the "pull-out direction".

[0023] 2. Structure of the Compensating Sleeve Insertion / Extraction Assist Tool of the Embodiment

[0024] The valve 10 of the hydraulic elevator is regularly inspected by an operator. The replacement parts during inspection include the O-ring of the compensating sleeve 16. In order to perform the replacement operation of this O-ring, it is necessary to temporarily pull out the compensating sleeve 16 from the valve 10. A threaded hole is provided on the top surface of the compensating sleeve 16. The operator screws a bolt into the threaded hole and pulls the bolt in the pull-out direction, thereby pulling out the compensating sleeve 16 from the sleeve hole. However, sometimes it is difficult to perform the operation of pulling out the compensating sleeve 16 that is firmly pressed in, and it may be a heavy operation for the operator.

[0025] The compensating sleeve insertion / extraction assist tool of the present embodiment is a tool for assisting the operation of pulling out the compensating sleeve 16 during such an inspection operation. Figure 2 FIG. is a view for explaining the component structure of the compensating sleeve insertion / extraction assist tool. Figure 3 FIG. is a view showing an installation example of the compensating sleeve insertion / extraction assist tool of the embodiment. Figure 4 FIG. is an enlarged view showing an installation example of the compensating sleeve insertion / extraction assist tool of the embodiment. Figure 5 FIG. is a view showing an operation example of the compensating sleeve insertion / extraction assist tool of the embodiment. Hereinafter, with appropriate reference to Figures 2 to 5 , the structure of the compensating sleeve insertion / extraction assist tool will be described.

[0026] The compensating sleeve insertion / extraction assist tool is configured to include a connecting member 18, a plate member 20, a fulcrum member 22, and an operating member 30.

[0027] The connecting member 18 is a member for mounting the plate member 20 at a clearance from the top surface 161 of the compensation sleeve 16 in the pulling-out direction. Typically, the connecting member 18 is a connecting bolt having a threaded portion 181 formed at one end side and a head 182 formed at the other end side. The threaded portion 181 is a portion that is screwed into a threaded hole 162 provided in the top surface 161 of the compensation sleeve 16. That is, the threaded portion 181 has a thread diameter and a pitch that can be screwed into the threaded hole 162. The head 182 is configured to have a diameter larger than that of the threaded portion 181. As such a connecting bolt of the connecting member 18, for example, an M6 bolt is exemplified. The compensation sleeve insertion / extraction assisting tool of the present embodiment includes two connecting bolts as the connecting member 18, but the number of connecting bolts may also be one.

[0028] The plate member 20 is an L-shaped angle bar in cross section having a working surface 202 and a gripping surface 204 perpendicular to the working surface 202. The plate thickness of the plate member 20 is, for example, 3 mm. Two through holes 206 are formed in the working surface 202. The diameters of the two through holes 206 are larger than the diameter of the threaded portion 181 of the connecting member 18 and smaller than the diameter of the head 182. When the connecting member 18 is an M6 connecting bolt, the diameter of the through hole 206 is, for example, 7 mm. The distance between the two through holes 206 is the same as the distance between the two threaded holes 162 provided in the top surface 161 of the compensation sleeve 16. The gripping surface 204 is a portion for enabling an operator to grip the plate member 20 by hand during operation. The shape and size of the gripping surface 204 are not limited. In addition, the gripping surface 204 is not an essential structure.

[0029] The two connecting bolts as the connecting member 18 are respectively screwed into the two threaded holes 162 in a state of being inserted through the two through holes 206 of the plate member 20. Thereby, one end side of the connecting member 18, that is, the threaded portion 181, is connected to the top surface 161 of the compensation sleeve 16, and the other end side, that is, the head 182, is connected to the plate member 20.

[0030] The plate member 20 is connected to the connecting member 18 with the working surface 202 facing the pulling-out direction. A clearance is formed between the working surface 202 and the top surface 161 of the compensation sleeve 16. The connecting member 18 has a function of adjusting the width of the clearance by adjusting the screwing amount screwed into the threaded hole 162. Here, the clearance is adjusted to a width that can insert the end portion 304 of an operation member 30 described later.

[0031] The fulcrum member 22 is a member that is configured to protrude in the pulling-out direction by being screwed into the threaded hole 104 provided on the housing mating surface 102. The threaded hole 104 can utilize the threaded hole for mounting the housing 12. In this case, the fulcrum member 22 can use the mounting bolt 14 as a fulcrum bolt. The screwing amount of the fulcrum member 22 is adjusted so that the protruding amount protruding from the housing mating surface 102 becomes equal to or greater than the height of the acting surface 202 of the plate member 20 from the housing mating surface 102. That is, the fulcrum member 22 has a function of adjusting the protruding amount protruding from the housing mating surface 102.

[0032] The operating member 30 is a member directly operated by an operator during the pulling-out operation of the compensating sleeve 16. The operating member 30 has a base end portion 302, a distal end portion 304, and an intermediate portion 306. The distal end portion 304 is a portion inserted into the gap between the acting surface 202 and the top surface 161 of the compensating sleeve 16. The intermediate portion 306 is a portion that contacts the end portion of the fulcrum member 22 protruding from the housing mating surface 102. The base end portion 302 is a portion directly operated by the operator. Such an operating member 30 can utilize a wrench, for example. The length dimension of the operating member 30 is not limited. For example, the operating member 30 has a length such that the base end portion 302 extends to a position outside the outer edge portion of the housing mating surface 102.

[0033] 3. Steps of the pulling-out operation using the compensating sleeve insertion / extraction assist tool

[0034] Next, the steps of the method for pulling out the compensating sleeve 16 using the compensating sleeve insertion / extraction assist tool of the embodiment will be described in detail.

[0035] Preparation process: Process of removing the cover

[0036] As a preliminary preparation, the operator removes the mounting bolt 14 and removes the housing 12 from the valve 10. Thereby, the housing mating surface 102 of the valve 10 and the top surface 161 of the compensating sleeve 16 are exposed.

[0037] First process: Process of installing the fulcrum member 22

[0038] In the first process of the operation, the operator screws the fulcrum member 22 into the threaded hole 104 of the housing mating surface 102. The threaded hole 104 utilizes the threaded hole 104 among the plurality of threaded holes 104 provided around the sleeve hole of the compensating sleeve 16 and close to the center of the housing mating surface 102.

[0039] Second process: Process of installing the plate member 20

[0040] In the second process of the operation, the operator installs the plate member 20 on the compensation sleeve 16 using the connecting member 18. Here, with the connecting member 18 inserted through the through-hole 206 of the plate member 20, the operator threads the connecting member 18 with the threaded hole 162. At this time, the plate member 20 is connected to the connecting member 18 with the holding surface 204 located on the side opposite to the fulcrum member 22 side with respect to the connecting member 18. In addition, the plate member 20 is connected to the connecting member 18 with the holding surface 204 extending toward the side opposite to the housing mating surface 102 side. In addition, the order of the first process and the second process is not limited.

[0041] Third process: Adjustment process

[0042] In the third process of the operation, the operator adjusts the gap between the acting surface 202 of the plate member 20 and the top surface 161 of the compensation sleeve 16, and the protruding amount of the fulcrum member 22. Here, the operator adjusts the screwing amount of the connecting member 18 so that the width of the gap between the acting surface 202 of the plate member 20 and the top surface 161 of the compensation sleeve 16 is wider than the thickness of the end portion 304 of the operating member 30. In addition, the operator adjusts the screwing amount of the fulcrum member 22 so that the protruding amount of the fulcrum member 22 is equal to or greater than the height of the acting surface 202 of the plate member 20 from the housing mating surface 102.

[0043] Fourth process: Pull-out process

[0044] In the fourth process of the operation, the operator pulls out the compensation sleeve 16 from the sleeve hole of the valve 10 using the operating member 30. Here, the operator holds the base end portion 302 of the operating member 30 with one hand and inserts the end portion 304 of the operating member 30 into the gap between the acting surface 202 and the top surface 161 of the compensation sleeve 16, bringing the intermediate portion 306 into contact with the end portion of the fulcrum member 22. Then, while holding the holding surface 204 of the plate member 20 with the other hand, the operator applies a force to the base end portion 302 of the operating member 30 toward the housing mating surface 102 side of the valve 10. As a result, the base end portion 302 of the operating member 30 functions as the force point of the lever, the intermediate portion 306 functions as the fulcrum of the lever, and the end portion functions as the acting point of the lever. As a result, the acting surface 202 of the plate member 20 is pulled up in the pulling-out direction, and along with this, the compensation sleeve 16 is pulled up in the pulling-out direction from the sleeve hole.

[0045] The amount of movement of the acting point of the lever is smaller than that of the force point. Therefore, even if the base end portion 302 is moved to the maximum possible extent, the compensation sleeve 16 sometimes cannot be completely pulled out from the sleeve hole. In this case, the operator performs the adjustment process again and readjusts the screwing amount of the fulcrum member 22 so that the protruding amount of the fulcrum member 22 is above the height of the acting surface 202 of the plate member 20 from the housing mating surface 102. In this way, by alternately repeating the adjustment process and the pulling-out process as needed, the compensation sleeve 16 is pulled out from the sleeve hole. The operator replaces various replacement parts of the pulled-out compensation sleeve 16.

[0046] Fifth process: Insertion process

[0047] In the fifth process of the operation, the operator inserts the compensation sleeve 16 into the sleeve hole of the valve 10 using the operating member 30. Here, the operator inserts the compensation sleeve 16 into the sleeve hole of the valve 10 while holding the holding surface 204 of the plate member 20 by hand.

[0048] 4. Functions and effects of the compensation sleeve insertion / extraction auxiliary tool

[0049] According to the sleeve insertion / extraction auxiliary tool as described above, the following functions and effects can be obtained.

[0050] The sleeve insertion / extraction auxiliary tool can form a lever that pulls the compensation sleeve 16 in the pulling-out direction through the connecting member 18, the plate member 20, the fulcrum member 22, and the operating member 30. Thus, even the compensation sleeve 16 that is firmly pressed in can be pulled out with a smaller force. As a result, the burden on the operator is reduced.

[0051] The connecting member 18 has a threaded portion 181 and a head portion 182, and the threaded portion 181 is screwed into the threaded hole 162 provided in the compensation sleeve 16. According to such a structure, by adjusting the screwing amount of the threaded portion 181, the size of the gap between the acting surface 202 of the plate member 20 and the top surface 161 of the compensation sleeve 16 can be adjusted according to the thickness of the end portion 304 of the operating member 30.

[0052] The sleeve insertion / extraction auxiliary tool connects the plate member 20 to the top surface of the compensation sleeve 16 using two connecting bolts as the connecting member 18. Thereby, the plate member 20 can be connected reliably and stably.

[0053] The sleeve insertion / extraction auxiliary tool is connected to the connecting member 18 with the holding surface 204 of the plate member 20 extending toward the side opposite to the housing mating surface 102. According to such a structure, it is easy for the operator during the operation to hold the holding surface 204.

[0054] The sleeve insertion / extraction assisting tool is connected to the connecting member 18 with the holding surface 204 of the plate member 20 facing the side opposite to the fulcrum member 22 side with respect to the connecting member 18. With such a structure, even when the holding surface 204 is held, it is easy to see the acting surface 202 that becomes the point of action.

[0055] The sleeve insertion / extraction assisting tool is configured such that the operating member 30 can be detached and attached. With such a structure, it is possible to prevent the operating member 30 from becoming an obstacle when connecting the plate member 20 and the fulcrum member 22.

[0056] The sleeve insertion / extraction assisting tool uses the fulcrum bolt that is screwed into the threaded hole provided on the housing mating surface as the fulcrum member 22. With such a structure, it is possible to adjust the protruding amount of the fulcrum member 22 by adjusting the screwing amount.

[0057] The sleeve insertion / extraction assisting tool uses a wrench as the operating member 30. With such a structure, the extraction operation of the compensating sleeve 16 can be performed without the need for a special tool.

[0058] In addition, the operating member 30 has a length such that the base end portion 302 is located outside the outer edge portion of the housing mating surface 102. With such a structure, when the operator performs an operation of applying force to the base end portion 302 toward the housing mating surface 102 side, it is possible to prevent the hand holding the base end portion 302 from contacting the housing mating surface 102.

[0059] Reference Numeral Explanation

[0060] 10: valve; 12: housing; 14: mounting bolt; 16: compensating sleeve; 18: connecting member; 20: plate member; 22: fulcrum member; 30: operating member; 102: housing mating surface; 104: threaded hole; 161: top surface; 162: threaded hole; 181: threaded portion; 182: head; 202: acting surface; 204: holding surface; 206: through hole; 302: base end portion; 304: tip end portion; 306: intermediate portion.

Claims

1. A compensation sleeve insertion / extraction assisting tool for extracting a compensation sleeve from a sleeve hole provided on a housing mating surface of a valve of a hydraulic elevator. Wherein, The compensation sleeve insertion / extraction assisting tool includes: A connecting member, one end side of which is connected to the top surface of the compensation sleeve, and the other end side extends in the extraction direction of the compensation sleeve; A plate member, which is connected to the other end side of the connecting member and has an acting surface portion extending in a direction intersecting the extraction direction; A fulcrum member, which is provided to protrude from the housing mating surface in the extraction direction; And An operating member, the end portion of which contacts the acting surface portion of the plate member as an acting point, the middle portion of which contacts the fulcrum member as a fulcrum, and the base end portion of which is operated by an operator as a force point.

2. The compensation sleeve insertion / extraction assisting tool according to claim 1, Wherein, The connecting member includes a connecting bolt, which has a threaded portion formed on one end side and a head having a diameter larger than that of the threaded portion formed on the other end side. The connecting bolt is configured to be able to screw the threaded portion with a threaded hole provided on the top surface. The plate member has a through hole on the acting surface portion, the diameter of which is larger than that of the threaded portion and smaller than that of the head. The connecting bolt is screwed with the threaded hole in a state of being inserted through the through hole, so that a gap is formed between the acting surface portion and the top surface. The width of the gap is such that the end portion of the operating member can be inserted.

3. The compensation sleeve insertion / extraction assisting tool according to claim 2, Wherein, The connecting member includes two of the connecting bolts. The plate member has two through holes on the acting surface portion with the same pitch as the two threaded holes provided on the top surface.

4. The compensation sleeve insertion / extraction assisting tool according to any one of claims 1 to 3, Wherein, The plate member is an L-shaped cross-section member having a gripping surface perpendicular to the acting surface portion. The plate member is connected to the connecting member with the gripping surface extending toward the side opposite to the housing mating surface side.

5. The compensation sleeve insertion / extraction assisting tool according to claim 4, Wherein, The plate member is connected to the connecting member with the gripping surface located on the side opposite to the fulcrum member side with respect to the connecting member.

6. The compensation sleeve insertion / extraction assisting tool according to any one of claims 1 to 5, Wherein, The operating member is configured to be detachable.

7. The compensation sleeve insertion / extraction assisting tool according to any one of claims 1 to 6, Wherein, The fulcrum member includes a fulcrum bolt screwed with a threaded hole provided on the housing mating surface.

8. The compensation sleeve insertion / extraction assisting tool according to any one of claims 1 to 7, Wherein, The operating member is a wrench.

9. The compensation sleeve insertion / extraction assisting tool according to any one of claims 1 to 8, Wherein, The operating member has a length such that the base end portion is located outside the outer edge portion of the housing mating surface.

10. A method for pulling out a compensation sleeve, which is used to pull out the compensation sleeve from a sleeve hole provided on the housing mating surface of a valve of a hydraulic elevator by using an auxiliary tool for inserting and pulling out the compensation sleeve. The auxiliary tool for inserting and pulling out the compensation sleeve comprises: a fulcrum bolt; a connecting bolt having a threaded portion formed at one end side and a head having a diameter larger than that of the threaded portion formed at the other end side; a plate member having an acting surface formed with a through hole having a diameter larger than that of the threaded portion and smaller than that of the head; and an operating member operated by an operator. The method for pulling out the compensation sleeve includes: a first step of screwing the fulcrum bolt into a threaded hole provided on the housing mating surface; a second step of screwing the connecting bolt into a threaded hole provided on the top surface of the compensation sleeve in a state of being inserted through the through hole, so as to form a gap between the acting surface and the top surface; a third step of adjusting the screwing amounts of the fulcrum bolt and the connecting bolt; and a fourth step of using the end portion as an acting point to make the end portion contact the acting surface of the plate member, using the middle portion as a fulcrum to make the middle portion contact the fulcrum bolt, and applying a force to the base end portion toward the housing mating surface side with the base end portion as a force point.

11. The method for pulling out the compensation sleeve according to claim 10, wherein, the third step includes the following steps: adjusting the screwing amount of the connecting bolt so that the gap becomes a width that allows the end portion of the operating member to be inserted; and adjusting the screwing amount of the connecting bolt so that the protruding amount of the fulcrum bolt becomes equal to or greater than the height of the acting surface of the plate member from the housing mating surface.

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