JP2014149028A - O-ring insertion jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an O-ring insertion jig capable of easily sending an O-ring to an inner prescribed position on a hole part of a check valve and reliably installing the O-ring onto a valve seat even in such a structure that a large-size pipe part larger than the outer diameter of a valve body is disposed on an inner part of the check valve.SOLUTION: An O-ring insertion jig 6 for replacing an O-ring 11 installed on a valve seat 15 of the interior of a hole part of a check valve 1 of such a structure that a large-size pipe part 16 larger than the outer diameter of a valve body (rough map) is disposed on a middle portion is constituted with a combination of a guide cylinder 61 which has the same outer diameter as the outer diameter of the valve body and has an inner diameter smaller than the outer diameter of the O-ring 11 and an extrusion cylinder 62 having an outer diameter which can be fitted into a cylinder body of the guide cylinder. The guide cylinder 61 is inserted to the hole part of the check valve 1 to which the valve body is inserted while the O-ring 11 is inserted in such a state that the O-ring 11 is subjected to flexural deformation in the cylinder body. The extrusion cylinder 62 is fitted into the cylinder body of the guide cylinder 61 inserted to the hole part of the check valve 1 and is extruded and, thereby, the O-ring 11 is released from the guide cylinder 61 and is installed to the valve seat 15.

Description

  The present invention relates to an insertion jig for inserting and installing an O-ring in a hydraulic control device. In particular, the O-ring is inserted into a hole of a check valve called a check valve and installed in a valve seat. The present invention relates to an O-ring insertion jig.

  2. Description of the Related Art Conventionally, a check valve for preventing a back flow of oil is generally used in a hydraulic control device that controls oil pressure and operates equipment. For this check valve, an O-ring is generally used to prevent oil leakage. Since this O-ring receives pressure from the check valve and oil pressure every time the hydraulic control device is operated, it may deteriorate and needs to be replaced periodically.

  A technique for inserting and installing the O-ring at a predetermined position of the device at the time of exchanging the O-ring has been proposed. For example, a sealing ring is provided in a circumferential groove formed on the inner peripheral surface of the cylinder. Examples include “sealing ring mounting device” (Patent Document 1) for mounting, and “O-ring mounting jig” (Patent Document 2) that can easily mount an O-ring on a mold.

Japanese Patent No. 2907563 Japanese Utility Model Publication No. 6-57564

  The technique according to Patent Document 1 and Patent Document 2 described above is a place (larger than the outer diameter of the valve body inside the check valve as a flow path of oil or air when the valve body of the check valve operates. It can be effectively applied if there is no diameter pipe part), but in the case of a structure with such a large diameter pipe part, replace the O-ring installed in the valve seat at the back of the hole with the check valve. The work place when performing the work to be performed is so narrow that the situation inside the check valve to be exchanged and the O-ring cannot be seen directly occurs, so the exchange work cannot be easily performed and is difficult to apply There is.

  Therefore, in such a situation, an operator works with a hand mirror in one hand, and when using an elongated object with the other hand when inserting an O-ring, When inserting an O-ring into the valve seat behind the check valve hole and inserting it into the check valve, it often drops into the large-diameter pipe and takes a lot of time to replace the O-ring. In addition, there is a problem that man-hours are required, and there is also a problem that the O-ring is easily damaged during work using a long object.

  The present invention has been made to solve such problems, and its technical problem is a structure in which a large-diameter pipe portion larger than the outer diameter of the valve body is provided inside the check valve. However, it is an object to provide an O-ring insertion jig that can easily send the O-ring to a predetermined position in the hole of the check valve and securely install it in the valve seat.

  In order to solve the above technical problem, the present invention provides an O valve installed in a valve seat in the back of a check valve hole having a large-diameter pipe portion having a diameter larger than the outer diameter of the valve body at an intermediate position. An O-ring insertion jig used for exchanging a ring, which has the same outer diameter as the outer diameter of the valve body and has an inner diameter smaller than the outer diameter of the O-ring, and the guide Consists of a combination of cylindrical extruded cylinders with outer diameters that can be fitted into cylindrical cylinders, and the guide cylinder is inserted into the cylinder with the O-ring bent and deformed, and then the valve element is inserted The extruded cylinder is inserted into the cylindrical body of the guide cylinder inserted into the hole of the check valve and pushed out, and the O-ring is inserted into the hole of the check valve. It deviates from the said guide cylinder, It installs in a valve seat, It is characterized by the above-mentioned.

  According to the O-ring insertion jig of the present invention, with respect to the guide cylinder inserted into the hole of the check valve into which the valve element has been inserted after the O-ring is inserted into the cylinder while being bent and deformed. Because the O-ring deviates from the guide cylinder and is installed on the valve seat by pushing out the extrusion cylinder fitted into the cylinder, it is larger than the outer diameter of the valve body inside the check valve. Even with a structure with a large-diameter pipe, the O-ring can be easily sent to a predetermined position in the hole of the check valve and securely installed in the valve seat. The replacement work can be easily performed.

It is sectional drawing which showed the state which removed the valve body and inserted in the hole of the non-return valve at the time of O-ring replacement | exchange of the O-ring insertion jig which concerns on Example 1 of this invention. It is the figure which illustrated the hydraulic circuit of the hydraulic control apparatus containing the non-return valve by which the O-ring exchanged demonstrated in FIG. 1 and the valve body was integrated. It is sectional drawing which showed the basic structure of the non-return valve by which the O-ring demonstrated in FIG. 1 was replaced | exchanged and the valve body was integrated. It is the perspective view which showed the external appearance structure in the assembly | attachment state of the O-ring insertion jig demonstrated in FIG. It is sectional drawing in the side direction which showed the detailed structure of the O-ring insertion jig demonstrated in FIG. 4 in the assembly | attachment state. FIG. 6 is a cross-sectional view showing a state in which the O-ring insertion jig described in FIG. 5 is removed from the valve body, inserted into the hole of the check valve, and the O-ring is deviated from the guide cylinder by pushing operation. It is sectional drawing which showed the state which moved the O-ring to the predetermined position from the state of FIG. 6, and was installed in the valve seat.

  Hereinafter, examples of the O-ring insertion jig of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view illustrating a state in which an O-ring insertion jig 6 according to Embodiment 1 of the present invention is inserted into a hole of a check valve 1 by removing a valve body when replacing an O-ring 11. Referring to FIG. 1, here, at the back of a hole provided in the casing 10 of the check valve 1 having a structure having a large-diameter pipe portion 16 having a diameter larger than the outer diameter of the valve body schematically illustrated in the middle portion. An O-ring insertion jig 6 is used to replace the O-ring 11 installed in the valve seat 15, and the O-ring insertion jig 6 is reversed by removing the valve body from the check valve 1 when replacing the O-ring 11. The state inserted in the hole of the stop valve 1 is shown.

  Among these, the ring insertion jig 6 has the same outer diameter as the outer diameter of the valve body and has a cylindrical guide cylinder 61 having an inner diameter smaller than the outer diameter of the O-ring 11, and the guide cylinder 61 has a cylindrical body. It is comprised by the combination of the cylindrical extrusion cylinder 62 which has the outer diameter which can be fitted in. The guide cylinder 61 has a flange portion 61a protruding outward at the end opposite to the insertion side with respect to the hole portion of the check valve 1 and is inserted in a state where the O-ring 11 is bent and deformed in the cylindrical body. It is inserted into the hole of the check valve 1 in which the valve body has been inserted. Here, the flange 61a has a function of determining the insertion direction of the check valve 1 in the hole of the check cylinder 1 in the guide cylinder 61. In addition, the wall surface of the flange 61a abuts on the wall surface around the hole portion to lock the stopper. Work as. The push-out cylinder 62 is inserted into a cylindrical body of the guide cylinder 61 inserted into the hole of the check valve 1 and pushed out, thereby causing the O-ring 11 to deviate from the guide cylinder 61 and the valve seat 15 at a predetermined position. Is to be installed. Incidentally, since the O-ring 11 is inserted into the cylindrical body of the guide cylinder 61 while being bent and deformed, and is not pushed out by the push-out cylinder 62, the middle part in FIG. However, in the installation state on the valve seat 15, as will be described later, the midway portion is arranged on a straight line with respect to the ring cross-section portions 11a and 11b.

  Further, a flow path is formed in the casing 10 of the check valve 1 from an upstream side port 17 formed on the opposite side of the valve seat 15 from the O ring 11 installation side through the O ring 11 and the valve body. As described above, one end (the upper end in FIG. 1) of the large-diameter pipe portion 16 is opened as the downstream side port 18.

  FIG. 2 is a diagram illustrating a hydraulic circuit of a hydraulic control device including the check valve 1 in which the O-ring 11 is replaced and the valve body is incorporated. In this hydraulic circuit, the check valve 1 has a function of sending the oil 21 sent from the pump 3 that sucks up the oil 21 stored in the tank 2 to the cylinder 4, a function of preventing the backflow of the oil 21 from the cylinder 4, have. In this hydraulic circuit, when the cylinder 4 is extended, the pump 3 sucks up the oil 21 in the tank 2 and sends it to the upstream side port 17 of the check valve 1. In the check valve 1, the oil 41 sent from the pump 3 is allowed to pass from the upstream side port 17 to the downstream side port 18, so that the plunger 41 of the cylinder 4 rises. Further, when the pump 3 is stopped, the raising of the plunger 41 of the cylinder 4 is also stopped. In this state, the check valve 1 prevents the pressure of the oil 21 due to the load supported by the plunger 41 in the cylinder 4 from being applied to the pump 3 to prevent the oil 21 from flowing back to the tank 2. When the cylinder 4 is contracted, the lowering valve 5 is operated to return the oil 21 in the cylinder 4 to the tank 2 and the plunger 41 of the cylinder 4 is lowered.

  FIG. 3 is a cross-sectional view showing the basic structure of the check valve 1 in which the O-ring 11 has been replaced and the valve body 12 is incorporated. Referring to FIG. 3, in the check valve 1, the valve body 12 is inserted into the hole portion of the housing 10 in a state where the valve body 12 can reciprocate in the hole portion. It is pressed toward the innermost valve seat 15 side. An O-ring 11 is installed on the outer periphery of the valve seat 15, and the end of the valve body 12 is pressed against the O-ring 11 by the biasing force of the spring 13 when the valve body 12 is not operating. In this check valve 1, when oil 21 is sent from the pump 3 to the upstream side port 17, the valve body 12 pushes the hole of the housing 10 through the spring 13 by the pressure of the oil 21 exceeding the urging force of the spring 13. It moves in the shrinking direction (left direction in FIG. 3). By this operation, the upstream side port 17 and the downstream side port 18 are connected. However, since the downstream side port 18 is connected to the large-diameter pipe portion 16 having a diameter larger than the diameter of the hole portion of the housing 10, 21 flows from the upstream side port 17 to the downstream side port 18 via the large-diameter pipe portion 16 in a flow direction 19 indicated by an arrow.

  Here, as shown in FIG. 3, the O-ring 11 is pressed against the end of the valve body 12 in a state where the valve body 12 is not operating, and the pressure of the oil 21 is maintained even in the operating state of the valve body 12. Therefore, the load is repeatedly received every time the hydraulic control device operates. As a result, if the material of the O-ring 11 is a flexible rubber or the like, there is a risk of deterioration due to secular change and damage, so when the hydraulic control device is operated to a predetermined number of times or operating time. Needs to disassemble the check valve 1 and replace the O-ring 11. The O-ring insertion jig 6 having the above-described structure can easily perform the operation when replacing the O-ring 11.

  FIG. 4 is a perspective view showing an external configuration of the O-ring insertion jig 6 in the assembled state. Referring to FIG. 4, the O-ring insertion jig 6 has a structure in which an extrusion cylinder 62 can be fitted into the cylindrical body of the guide cylinder 61, and the outer diameter of the guide cylinder 61 is that of the hole of the housing 10. The outer diameter of the extrusion cylinder 62 is slightly smaller than the inner diameter of the guide cylinder 61. The outer diameter of the flange 61 a provided at the end on the near side opposite to the insertion side with respect to the hole of the housing 10 of the guide cylinder 61 is larger than the outer diameter of the guide cylinder 61.

  FIG. 5 is a cross-sectional view in the side surface direction showing the detailed configuration of the O-ring insertion jig 6 in an assembled state. Referring to FIG. 5, the outer diameter D1 of the O-ring 11 is equal to the diameter of the hole of the housing 10 of the check valve 1 and the diameter of the valve seat 15, and the outer diameter D3 of the guide cylinder 61 is equal to the valve seat. It is slightly smaller than the diameter of 15 and the outer diameter D1 of the O-ring 11. Thereby, the inner diameter D4 of the guide cylinder 61 is further smaller than the outer diameter D1 of the O-ring 11 by the thickness. Further, the outer diameter of the extruded cylinder 62 is slightly smaller than the inner diameter D4 of the guide cylinder 61, and the inner diameter D5 of the extruded cylinder 62 is further reduced by the thickness of the cylinder. The thickness of the extruded cylinder 62 is set to a dimension such that the sum of the thickness of the guide cylinder 61 is larger than the outer diameter D2 in the cross section of the O-ring 11. Furthermore, the length of the guide cylinder 61 is set such that the length L2 of the portion excluding the flange 61a is equal to the length L from the entrance of the hole of the housing 10 of the check valve 1 to the valve seat 15, and the extruded cylinder 62 The length L3 is equal to the length including the flange portion 61a of the guide cylinder 61. Thereby, in a state where the extrusion cylinder 62 is completely inserted into the cylindrical body of the guide cylinder 61, both end portions of the guide cylinder 61 and the extrusion cylinder 62 are positioned on the same plane to form the same plane. Become.

  The procedure for replacing the O-ring 11 in the check valve 1 using the O-ring insertion jig 6 will be described below. First, as shown in FIG. 5, the operator inserts the extrusion cylinder 62 into the cylinder body from the side of the guide cylinder 61 having the flange portion 61a and inserts the O-ring insertion jig 6 into the opening on the opposite side. The O-ring 11 is inserted while being bent and deformed. Here, since the inner diameter D4 of the guide cylinder 61 is smaller than the outer diameter D1 of the O-ring 11, the O-ring 11 is inserted into the cylindrical body of the guide cylinder 61 in a deformed state. The O-ring 11 has a restoring force and is held on the inner wall of the guide cylinder 61.

  Next, the worker guides the O-ring insertion jig 6 in the state as shown in FIG. 5 into the hole of the housing 10 of the check valve 1 with the valve body 12 removed as described above. 61 is inserted from the side opposite to the side having the flange portion 61a. In this state, the O-ring 11 can be inserted into the vicinity of the valve seat 15 while avoiding the large-diameter pipe portion 16 while being held in the guide cylinder 61. At this time, it is assumed that the O-ring insertion jig 6 is inserted to a position where there is a predetermined gap between the insertion side end portion and the valve seat 15. However, once the insertion side end of the O-ring insertion jig 6 is inserted until it abuts against the valve seat 15, the flange 61a of the guide cylinder 61 is pulled back somewhat, and the insertion side end of the O-ring insertion jig 6 and the valve An interval may be provided between the seat 15 and the seat 15. In any case, since the extrusion cylinder 62 is not pushed out at this stage, the O-ring 11 exists in the cylindrical body of the guide cylinder 61 and is not deviated.

  Subsequently, the operator pushes out the pushing cylinder 62 so as to be completely inserted into the guide cylinder 61. In this process, the O-ring 11 is pushed out from the end surface of the extrusion cylinder 62 and deviates from the guide cylinder 61.

  FIG. 6 is a cross-sectional view showing a state in which the O-ring insertion jig 6 is removed from the valve cylinder 12 and inserted into the hole of the check valve 1 and the O-ring 11 is deviated from the guide cylinder 61 by the pushing operation. . Referring to FIG. 6, here, the O-ring 11 is pushed out by the end face of the extrusion cylinder 62, deviates from the guide cylinder 61, and exists in the gap with the valve seat 15. In this state, since the outer diameter D1 of the O-ring 11 is the same as the diameter of the valve seat 15, the O-ring 11 is held by the inner wall of the hole due to the restoring force and falls into the large-diameter pipe portion 16. However, it is still insufficient for installation on the valve seat 15.

  Therefore, the operator further presses the end surfaces of the guide cylinder 61 and the extrusion cylinder 62 of the O-ring insertion jig 6 until they abut against the valve seat 15 at the same time. In this process, the O-ring 11 moves to a predetermined position and is installed on the valve seat 15.

  FIG. 7 is a cross-sectional view showing a state where the O-ring 11 is moved to a predetermined position from the state shown in FIG. Referring to FIG. 7, in the state where the end surfaces of the guide cylinder 61 and the extrusion cylinder 62 are completely inserted by being pressed until the end surfaces of the guide cylinder 61 and the extrusion cylinder 62 simultaneously contact each other, the total thickness of the guide cylinder 61 and the extrusion cylinder 62 is the O-ring 11. Therefore, the O-ring 11 is pressed by the end surfaces of the guide cylinder 61 and the extrusion cylinder 62 while maintaining its shape after restoration, and is in close contact with the valve seat 15. When the O-ring 11 is installed in the valve seat 15, the midway portion is arranged on a straight line with respect to the ring cross-sections 11a and 11b as described above. As a result of inserting the O-ring insertion jig 6, the worker is brought into close contact with the valve seat 15 at the time when the operator feels that the O-ring is inserted, and the installation is completed.

  Thus, if the O-ring 11 is installed in the valve seat 15 at the back of the hole of the housing 10 of the check valve 1 using the O-ring insertion jig 6 according to the first embodiment, The O-ring 11 is not dropped, and the O-ring 11 can be easily attached to the valve seat 15 and installed at a proper position.

  Note that the check valve 1 to which the O-ring insertion jig 6 according to the first embodiment is applied has been described as being applied to a hydraulic control device. However, the check valve 1 may be applied to a device that performs control by other fluids such as water pressure or air pressure. Since the present invention can be similarly applied when replacing the O-ring of the check valve to be applied, the O-ring insertion jig 6 of the present invention is not limited to the one disclosed in the first embodiment.

DESCRIPTION OF SYMBOLS 1 Check valve 2 Tank 3 Pump 4 Cylinder 5 Lowering valve 6 O ring jig | tool 10 Housing | casing 11 O ring 11a, 11b Ring cross-section part 12 Valve body 13 Spring 15 Valve seat 16 Large diameter pipe part 17 Upstream side port 18 Downstream Side port 19 Flow direction 21 Oil 61 Guide cylinder 61a Hut 61b Extrusion cylinder

Claims (2)

O-ring insertion jig used to replace the O-ring installed in the valve seat at the back of the check valve hole having a large diameter pipe portion larger than the outer diameter of the valve body in the middle Because
A cylindrical guide cylinder having an outer diameter equal to the outer diameter of the valve body and having an inner diameter smaller than the outer diameter of the O-ring, and a cylinder having an outer diameter that can be fitted into the cylinder of the guide cylinder Composed of a combination of cylindrical extrusion cylinders,
The guide cylinder is inserted into the hole of the check valve into which the valve body has been inserted after being inserted in a state where the O-ring is bent and deformed in the cylinder,
The push-out cylinder is installed in the valve seat by causing the O-ring to deviate from the guide cylinder by being fitted into a cylinder of the guide cylinder inserted into the hole of the check valve and pushed out. An O-ring insertion jig characterized by   The O-ring insertion jig according to claim 1, wherein a total thickness of the guide cylinder and the extrusion cylinder in an assembled state is larger than an outer diameter in a cross section of the O-ring. .