Compensation sleeve insertion / extraction assisting tool and method for extracting compensation sleeve

Abstract

This compensation sleeve insertion / extraction assisting tool is used in inserting or extracting a compensation sleeve into or out of a valve in a hydraulic elevator. The compensation sleeve insertion / extraction assisting tool comprises: a connection member which has one end side connected to the top surface of a compensation sleeve and has the other end side extending in an extraction direction of the compensation sleeve; a plate member which is connected to the other end side of the connection member and which has a working surface portion that extends in a direction crossing the extraction direction; a fulcrum member which is provided so as to protrude from a case mating surface in the extraction direction; and an operating member which has a tip portion, as a working point, coming into contact with the working surface portion of the plate member, has an intermediate portion, as a fulcrum, coming into contact with the fulcrum member, and has a base end portion, as a force point, to be operated by a worker.

Description

Compensation sleeve insertion / removal aid and compensation sleeve removal method

[0001] The present disclosure relates to techniques for extracting or inserting compensating sleeves for hydraulic elevator valves.

[0002] Patent Document 1 discloses a sleeve removal device. This sleeve removal device includes a rod-shaped member. The rod-shaped member is provided with a tap portion that rotates while engaging with the inner wall of the sleeve to form a female thread on the inner wall of the sleeve. Therefore, by inserting the rod-shaped member into the inside of the sleeve while rotating, the tap portion on the rod-shaped member and the sleeve are threadedly coupled. By withdrawing the rod-shaped member coupled to the sleeve from an object, the sleeve that is press-fitted into the object is also withdrawn from the object.

[0003] Japanese Patent Publication No. 2018-20387

[0004] Valves for hydraulic elevators are sometimes overhauled. Valve overhauls involve the task of removing a compensating sleeve from the valve. In this task, as with the technique disclosed in Patent Document 1, a part such as a screw is threaded onto the compensating sleeve, and then the screw is removed together with the compensating sleeve. However, removing a tightly pressed-in compensating sleeve can be difficult and potentially heavy work for the worker. This also applies to the task of inserting a compensating sleeve into a valve.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a compensating sleeve insertion / extraction aid and a compensating sleeve extraction method that can reduce the burden on workers when pulling out or inserting a compensating sleeve of a hydraulic elevator valve.

[0006] The present disclosure relates to a compensating sleeve insertion / removal aid for pulling out a compensating sleeve from a sleeve hole provided on a case mating surface of a valve of a hydraulic elevator, comprising: a connecting member having one end connected to the top surface of the compensating sleeve and the other end extending in the direction in which the compensating sleeve is pulled out; a plate member connected to the other end of the connecting member and having an operating surface portion extending in a direction intersecting the pulling direction; a fulcrum member provided so as to protrude from the case mating surface in the pulling direction; and an operating member having a tip portion that contacts the operating surface portion of the plate member as a point of application, an intermediate portion that contacts the fulcrum member as a fulcrum, and a base end that is operated by an operator as a force point.

[0007] The present disclosure also provides a method for extracting a compensating sleeve from a sleeve hole formed in a case mating surface of a valve of a hydraulic elevator using a compensating sleeve insertion / extraction aid including: a fulcrum bolt; a connecting bolt having a threaded portion formed on one end thereof and a head portion formed on the other end thereof with a diameter larger than that of the threaded portion; a plate member having an operating surface portion with a through hole formed therein that is larger in diameter than the threaded portion and smaller in diameter than the head portion; and an operating member operated by an operator, the method comprising: a first step of threading the fulcrum bolt into the threaded hole formed in the case mating surface; a second step of threading the connecting bolt into the threaded hole formed in the top surface such that a gap is formed between the operating surface portion and the top surface of the compensating sleeve while the connecting bolt is inserted into the through hole; a third step of adjusting the amounts of threading of the fulcrum bolt and the connecting bolt; and a fourth step of bringing the fulcrum bolt into contact with the operating surface portion of the plate member at its tip end as a point of application, bringing the fulcrum bolt into contact with the middle portion as a fulcrum, and urging the fulcrum bolt toward the case mating surface at its base end as a force point.

[0008] According to the compensating sleeve insertion / removal aid of the present disclosure, the connecting member, the plate member, the fulcrum member, and the operating member form a lever that pulls up the compensating sleeve in the removal direction. This allows even a tightly pressed-in compensating sleeve to be removed with little force, thereby reducing the burden on the operator.

[0009] Fig. 1 is a diagram showing the external configuration of a valve to which an insertion / extraction auxiliary tool according to an embodiment is applied. Fig. 2 is a diagram for explaining the component configuration of a compensating sleeve insertion / extraction auxiliary tool. Fig. 3 is a diagram showing an installation example of a compensating sleeve insertion / extraction auxiliary tool according to an embodiment. Fig. 4 is an enlarged view showing an installation example of a compensating sleeve insertion / extraction auxiliary tool according to an embodiment. Fig. 5 is a diagram showing an operation example of a compensating sleeve insertion / extraction auxiliary tool according to an embodiment.

[0010] Hereinafter, an embodiment will be described with reference to the drawings. Note that elements common to the various drawings are given the same reference numerals and redundant explanations will be omitted.

[0011] Embodiment 1. External Configuration of a Valve to Which a Compensation Sleeve Insertion / Extraction Aid in an Embodiment is Applied FIG. 1 is a diagram showing the external configuration of a valve to which an insertion / extraction aid in an embodiment is applied. The valve 10 shown in this figure is a device for controlling the hydraulic pressure of a hydraulic elevator. A case 12 is attached to one side of the valve 10 with six mounting bolts 14. A compensating sleeve 16 is an internal component of the valve 10. Removing the case 12 exposes the top surface of the compensating sleeve 16 inserted into the sleeve hole. In the following description, the direction in which the compensating sleeve 16 is pulled out of the sleeve hole is referred to as the "pulling direction."

[0012] 2. Configuration of the Compensation Sleeve Insertion / Removal Aid of the Embodiment The valve 10 of a hydraulic elevator is periodically overhauled by an operator. The O-ring of the compensating sleeve 16 is included in the replacement parts during an overhaul. To replace this O-ring, the compensating sleeve 16 must be temporarily removed from the valve 10. A threaded hole is provided on the top surface of the compensating sleeve 16. An operator threads a bolt into the threaded hole and pulls the bolt in the removal direction to remove the compensating sleeve 16 from the sleeve hole. However, removing the compensating sleeve 16, which is tightly pressed in, can be difficult and may be a heavy task for the operator.

[0013] The compensating sleeve insertion / extraction aid of this embodiment is a tool that assists in the work of pulling out the compensating sleeve 16 during such overhaul work. FIG. 2 is a diagram for explaining the component configuration of the compensating sleeve insertion / extraction aid. FIG. 3 is a diagram showing an example of an attachment of the compensating sleeve insertion / extraction aid of this embodiment. FIG. 4 is an enlarged view showing an example of an attachment of the compensating sleeve insertion / extraction aid of this embodiment. FIG. 5 is a diagram showing an example of operation of the compensating sleeve insertion / extraction aid of this embodiment. The configuration of the compensating sleeve insertion / extraction aid will be described below with appropriate reference to FIGS. 2 to 5.

[0014] The compensating sleeve insertion / removal aid is configured to include a connecting member 18 , a plate member 20 , a fulcrum member 22 , and an operating member 30 .

[0015] The connecting member 18 is a component for attaching the plate member 20 to the top surface 161 of the compensating sleeve 16 with a gap in the removal direction. Typically, the connecting member 18 is a connecting bolt having a threaded portion 181 formed on one end and a head portion 182 formed on the other end. The threaded portion 181 is a portion that screws into a threaded hole 162 provided in the top surface 161 of the compensating sleeve 16. In other words, the threaded portion 181 has a thread diameter and pitch that allow it to be threadably engaged with the threaded hole 162. The head portion 182 is configured with a larger diameter than the threaded portion 181. An example of such a connecting bolt as the connecting member 18 is an M6 bolt. The compensating sleeve insertion / extraction aid of the present embodiment includes two connecting bolts as the connecting member 18, but the number of connecting bolts may be one.

[0016] The plate member 20 is an angle bar with an L-shaped cross section, having an operating surface portion 202 and a gripping surface portion 204 perpendicular to the operating surface portion 202. The plate member 20 has a thickness of, for example, 3 mm. Two through holes 206 are formed in the operating surface portion 202. The diameters of the two through holes 206 are larger than the threaded portion 181 of the connecting member 18 and smaller than the head portion 182. When the connecting member 18 is an M6 connecting bolt, the diameter of the through holes 206 is, for example, 7 mm. The pitch between the two through holes 206 is the same as the pitch between the two screw holes 162 formed in the top surface 161 of the compensating sleeve 16. The gripping surface portion 204 is a portion that allows an operator to grip the plate member 20 with their hands during work. There are no limitations on the shape or size of the gripping surface portion 204. Furthermore, the gripping surface portion 204 is not a required component.

[0017] The two connecting bolts serving as the connecting member 18 are inserted into the two through holes 206 of the plate member 20, respectively, and then screwed into the two screw holes 162. As a result, the connecting member 18 has a threaded portion 181 at one end connected to the top surface 161 of the compensating sleeve 16, and a head portion 182 at the other end connected to the plate member 20.

[0018] The plate member 20 is connected to the connecting member 18 with the operating surface portion 202 oriented in a direction intersecting the pull-out direction. A gap is formed between the operating surface portion 202 and the top surface 161 of the compensating sleeve 16. The connecting member 18 has a function of adjusting the amount of threading into the screw hole 162 to adjust the width of the gap. Here, the width of the gap is adjusted to allow the insertion of a tip portion 304 of the operating member 30, which will be described later.

[0019] The fulcrum member 22 is a member that is disposed so as to protrude in the removal direction by being screwed into a screw hole 104 provided in the case mating surface 102. The screw hole 104 can be a screw hole for attaching the case 12. In this case, the mounting bolt 14 can be used as the fulcrum bolt for the fulcrum member 22. The amount of screwing of the fulcrum member 22 is adjusted so that the amount of protrusion from the case mating surface 102 is equal to or greater than the height of the operating surface portion 202 of the plate member 20 from the case mating surface 102. In other words, the fulcrum member 22 has the function of adjusting the amount of protrusion from the case mating surface 102.

[0020] The operating member 30 is a member that is directly operated by an operator when removing the compensating sleeve 16. The operating member 30 has a base end 302, a tip end 304, and an intermediate portion 306. The tip end 304 is a portion that is inserted into the gap between the operating surface portion 202 and the top surface 161 of the compensating sleeve 16. The intermediate portion 306 is a portion that contacts the end of the fulcrum member 22 that protrudes from the case mating surface 102. The base end 302 is a portion that is directly operated by an operator. For example, a spanner wrench can be used as the operating member 30. There is no limitation on the length of the operating member 30. For example, the operating member 30 has a length such that the base end 302 extends outward beyond the outer edge of the case mating surface 102.

[0021] 3. Extraction Procedure Using Compensation Sleeve Insertion / Extraction Auxiliary Tool Next, the procedure for extracting the compensating sleeve 16 using the compensating sleeve insertion / extraction auxiliary tool of the embodiment will be described in detail.

[0022] Preparation Process: Cover Removal Process As a preliminary preparation, an operator removes the mounting bolts 14 and removes the case 12 from the valve 10. This exposes the case mating surface 102 of the valve 10 and the top surface 161 of the compensating sleeve 16.

[0023] First Step: Attaching Fulcrum Member 22 In the first step of the work, the worker screws the fulcrum member 22 into the screw hole 104 of the case mating surface 102. Of the multiple screw holes 104 provided around the sleeve hole of the compensating sleeve 16, the screw hole 104 closest to the center of the case mating surface 102 is used.

[0024] Second Step: Step of Attaching Plate Member 20 In the second step of the work, the worker attaches the plate member 20 to the compensating sleeve 16 using the connecting member 18. Here, the worker inserts the connecting member 18 into the through hole 206 of the plate member 20 and screws the connecting member 18 into the screw hole 162. At this time, the plate member 20 is connected to the connecting member 18 in an orientation such that the gripping surface portion 204 is positioned on the opposite side of the connecting member 18 from the side of the fulcrum member 22. Furthermore, the plate member 20 is connected to the connecting member 18 in an orientation such that the gripping surface portion 204 extends toward the opposite side of the case mating surface 102. Note that there is no limitation on the order of the first and second steps.

[0025] Third Step: Adjustment Step In the third step of the work, the worker adjusts the gap between the acting surface portion 202 of the plate member 20 and the top surface 161 of the compensating sleeve 16, and the protrusion amount of the fulcrum member 22. Here, the worker adjusts the screwing amount of the connecting member 18 so that the width of the gap between the acting surface portion 202 of the plate member 20 and the top surface 161 of the compensating sleeve 16 is wider than the thickness of the tip portion 304 of the operating member 30. The worker also adjusts the screwing amount of the fulcrum member 22 so that the protrusion amount of the fulcrum member 22 is equal to or greater than the height of the acting surface portion 202 of the plate member 20 from the case mating surface 102.

[0026] Fourth Step: Pulling-Out Step In the fourth step of the operation, the worker uses the operating member 30 to pull the compensating sleeve 16 out of the sleeve hole of the valve 10. Here, the worker grasps the base end 302 of the operating member 30 with one hand and inserts the tip end 304 of the operating member 30 into the gap between the action surface portion 202 and the top surface 161 of the compensating sleeve 16, bringing the intermediate portion 306 into contact with the tip end of the fulcrum member 22. Then, while grasping the gripping surface portion 204 of the plate member 20 with the other hand, the worker biases the base end 302 of the operating member 30 toward the case mating surface 102 of the valve 10. As a result, the base end 302 of the operating member 30 functions as the point of force of the lever, the intermediate portion 306 functions as the fulcrum of the lever, and the tip end functions as the point of action of the lever. As a result, the operating surface portion 202 of the plate member 20 is pulled up in the pulling direction, and accordingly, the compensating sleeve 16 is pulled up in the pulling direction from the sleeve hole.

[0027] The movement of the point of application of a lever is smaller than the movement of the point of effort. For this reason, even if the base end 302 is moved to the maximum extent possible, the compensating sleeve 16 may not be completely pulled out of the sleeve hole. In this case, the worker performs the adjustment process again and readjusts the amount of engagement of the fulcrum member 22 so that the amount of protrusion of the fulcrum member 22 is equal to or greater than the height of the operating surface portion 202 of the plate member 20 from the case mating surface 102. In this way, the adjustment process and the pulling process are alternately repeated as necessary until the compensating sleeve 16 is pulled out of the sleeve hole. The worker then replaces the various replacement parts for the pulled-out compensating sleeve 16.

[0028] Fifth Step: Insertion Step In the fifth step of the work, the worker uses the operating member 30 to insert the compensating sleeve 16 into the sleeve hole of the valve 10. Here, the worker inserts the compensating sleeve 16 into the sleeve hole of the valve 10 while gripping the gripping surface portion 204 of the plate member 20 with his or her hand.

[0029] 4. Functions and Effects of the Compensation Sleeve Insertion / Extraction Aid The above-described sleeve insertion / extraction aid provides the following functions and effects.

[0030] The sleeve insertion / removal aid can form a lever that pulls up the compensating sleeve 16 in the removal direction using the connecting member 18, plate member 20, fulcrum member 22, and operating member 30. This allows even a tightly press-fitted compensating sleeve 16 to be removed with a small force, reducing the burden on the worker.

[0031] The connecting member 18 includes a threaded portion 181 and a head portion 182, and the threaded portion 181 is threaded into a threaded hole 162 provided in the compensating sleeve 16. With this configuration, by adjusting the degree of threading of the threaded portion 181, the size of the gap between the operating surface portion 202 of the plate member 20 and the top surface 161 of the compensating sleeve 16 can be adjusted in accordance with the thickness of the tip portion 304 of the operating member 30.

[0032] The sleeve insertion / removal aid uses two connecting bolts as connecting members 18 to connect the plate member 20 to the top surface of the compensating sleeve 16. This allows the plate member 20 to be connected reliably and stably.

[0033] The sleeve insertion / removal aid is connected to the connecting member 18 in a direction in which the gripping surface 204 of the plate member 20 extends toward the side opposite the case mating surface 102. With this configuration, it is easy for a worker to grip the gripping surface 204 during work.

[0034] The sleeve insertion / removal aid is connected to the connecting member 18 in such a manner that the gripping surface 204 of the plate member 20 is positioned on the opposite side of the connecting member 18 from the side of the fulcrum member 22. With this configuration, even when the gripping surface 204 is gripped, the action surface 202, which serves as the point of action, is easily visible.

[0035] The sleeve insertion / extraction aid is configured so that the operating member 30 is detachable. With this configuration, it is possible to prevent the operating member 30 from getting in the way when connecting the plate member 20 and the fulcrum member 22.

[0036] The sleeve insertion / removal aid uses a fulcrum bolt that is screwed into a screw hole provided on the mating surface of the case as the fulcrum member 22. With this configuration, the amount of protrusion of the fulcrum member 22 can be adjusted by adjusting the amount of screwing.

[0037] The sleeve insertion / removal aid uses a spanner wrench as the operating member 30. With this configuration, the compensating sleeve 16 can be removed without using any special tools.

[0038] Furthermore, the operating member 30 has a length that positions the base end 302 outside the outer edge of the case mating surface 102. With this configuration, when an operator presses the base end 302 toward the case mating surface 102, the hand holding the base end 302 can be prevented from coming into contact with the case mating surface 102.

[0039] DESCRIPTION OF SYMBOLS 10 Valve, 12 Case, 14 Mounting bolt, 16 Compensation sleeve, 18 Connecting member, 20 Plate member, 22 Fulcrum member, 30 Operating member, 102 Case mating surface, 104 Screw hole, 161 Top surface, 162 Screw hole, 181 Threaded portion, 182 Head portion, 202 Working surface portion, 204 Grip surface portion, 206 Through hole, 302 Base end portion, 304 Tip portion, 306 Intermediate portion

Claims

1. A compensating sleeve insertion / removal aid for pulling out a compensating sleeve from a sleeve hole provided on a case mating surface of a valve of a hydraulic elevator, A connecting member having one end connected to the top surface of the compensating sleeve and another end extending in the direction in which the compensating sleeve is pulled out; a plate member connected to the other end of the connection member and having an operating surface portion extending in a direction intersecting the pull-out direction; a fulcrum member provided so as to protrude from the case mating surface in the removal direction; an operating member having a tip portion that contacts the operating surface portion of the plate member as a point of application, a middle portion that contacts the fulcrum member as a fulcrum, and a base end portion that is operated by an operator as a force point; A compensating sleeve insertion / removal aid comprising:

2. the connecting member includes a connecting bolt having a threaded portion formed on the one end side and a head portion formed on the other end side with a larger diameter than the threaded portion, The connection bolt is configured so that the threaded portion can be screwed into a threaded hole provided on the top surface, the plate member has a through hole in the working surface portion, the through hole having a diameter larger than that of the screw portion and smaller than that of the head portion, The connecting bolt is screwed into the screw hole such that a gap is formed between the operating surface portion and the top surface when the connecting bolt is inserted into the through hole, The gap has a width that allows the tip of the operating member to be inserted. The compensating sleeve insertion / removal aid according to claim 1.

3. The connection member includes two of the connection bolts, The plate member has two through holes on the working surface portion at the same pitch as the two screw holes provided on the top surface. The compensating sleeve insertion / removal aid according to claim 2.

4. The plate member is an L-shaped member having a gripping surface portion perpendicular to the action surface portion, The plate member is connected to the connecting member in such a direction that the grip surface portion extends toward the opposite side to the case mating surface. The compensating sleeve insertion / removal aid according to any one of claims 1 to 3.

5. The plate member is connected to the connecting member in such an orientation that the gripping surface portion is positioned on the opposite side to the fulcrum member with respect to the connecting member. The compensating sleeve insertion / removal aid according to claim 4.

6. The operating member is configured to be detachable. The compensating sleeve insertion / removal aid according to claim 1 or 2.

7. 3. The compensating sleeve insertion / removal aid according to claim 1, wherein the fulcrum member includes a fulcrum bolt screwed into a screw hole provided in the mating surface of the case.

8. The operating member is a spanner wrench. The compensating sleeve insertion / removal aid according to claim 1 or 2.

9. The operating member has a length such that the base end is positioned outside an outer edge of the case mating surface. The compensating sleeve insertion / removal aid according to claim 1 or 2.

10. A method for extracting a compensating sleeve from a sleeve hole provided on a case mating surface of a valve of a hydraulic elevator using a compensating sleeve insertion / extraction auxiliary tool including: a fulcrum bolt; a connecting bolt having a threaded portion formed on one end side and a head portion formed on the other end side with a diameter larger than that of the threaded portion; a plate member having an operating surface portion formed with a through hole having a diameter larger than that of the threaded portion and a diameter smaller than that of the head portion; and an operating member operated by an operator, a first step of screwing the fulcrum bolt into a screw hole provided in the mating surface of the case; a second step of screwing the connecting bolt into a threaded hole provided on the top surface of the compensating sleeve such that a gap is formed between the action surface portion and the top surface of the compensating sleeve while the connecting bolt is inserted into the through hole; a third step of adjusting the amount of engagement of the fulcrum bolt and the connection bolt; a fourth step of bringing the tip end portion into contact with the operating surface portion of the plate member as a point of application, bringing the middle portion into contact with the fulcrum bolt as a fulcrum, and biasing the base end portion toward the case mating surface as a point of force; A method for removing a compensating sleeve comprising:

11. The third step comprises: adjusting the amount of engagement of the connection bolt so that the gap has a width allowing the tip portion of the operation member to be inserted; adjusting the amount of engagement of the connection bolt so that the amount of protrusion of the fulcrum bolt is equal to or greater than the height of the operating surface portion of the plate member from the case mating surface; The method of claim 10, further comprising: