Solid tire attachment / detachment device

Abstract

To provide a solid tire attachment / detachment device with improved workability, capable of mounting a support body coaxially with a piston axis with high accuracy.SOLUTION: A solid tire attachment / detachment device 1 comprises: a double action hydraulic cylinder CY1 having a first cylinder case 11, a first piston 12, a second cylinder case 13, a second piston 14 and a piston rod 15; a hydraulic power source 5; a cylindrical support body 7 for supporting a wheel W; a pressing body 10 mounted on a tire T, with a press ring part 8 into which the support body 7 is inserted, having a diameter greater than that of the support body 7; and a nut 9 that is screwed onto a projecting portion 15a of a piston rod 15 projecting from the second cylinder case 13, and prevents displacement of the pressing body 10 in a direction separating from a mounting surface 3. The first cylinder case 11 includes a positioning projection part 3a provided on an end surface of the first cylinder case 11 exposed from an opening 2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a solid tire mounting / removal device for removing a tire body of a solid tire used on an industrial vehicle such as a forklift from a wheel and mounting the tire body onto the wheel. [Background technology]

[0002] A conventional solid tire mounting / removal device is described as a tire mounting / removal device in, for example, Patent Document 1. This conventional tire mounting / removal device includes a table body having a mounting surface for setting the tire, support body, and wheel and having an opening in the center, a cylinder attached so as to hang down from the underside of the table body, a cylindrical piston that extends upward and telescopically penetrates the central opening of the table body when driven by the cylinder, and a set screw rod that is telescopically and engageably attached to the piston.

[0003] The tire is mounted on the wheel by applying pressure to the tire by the attachment / detachment ring engaged with the end of the set screw rod in the direction of the table body due to the pressure generated when the piston and the set screw rod are lowered by driving the cylinder. The support body is cylindrical and configured to support the lower edge of the wheel so as to be approximately concentric with the piston. When mounting a tire on a wheel, the support body is placed on a mounting surface, the lower edge of the wheel is supported by the support body, the tire is placed on the upper edge of the wheel, and the tire is mounted on the wheel by pressing the tire from above with the attachment / detachment ring. When removing a tire from a wheel, the lower edge of the wheel on which the tire is mounted is supported by the support body, and the attachment / detachment ring placed on the tire is driven by the cylinder in a direction approaching the mounting surface, thereby removing the tire from the wheel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-277808 Summary of the Invention [Problem to be solved by the invention]

[0005] The conventional technology of the above-mentioned Patent Document 1 does not have a configuration for positioning the support so that the support placed on the mounting surface is coaxial with the axis of the piston, so an operator must visually place the support on the mounting surface, and after placing the support, the position of the support must be adjusted so that the support is coaxial with the axis of the piston, which causes a problem of poor workability. In addition, when an operator manually positions the support, the support may deviate from the axis of the piston, and if the axis of the support deviates from the axis of the piston, the axis of the wheel placed on the support and the tire placed on the wheel will also deviate. In this state, if the tire is pressed by the mounting / detaching ring with a large pressing force of 80 tons or more, there is a problem that the pressing force of the mounting / detaching ring acts eccentrically on the tire.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a solid tire mounting / removal device which can mount a support body so as to be coaxial with the axis of a piston with high accuracy and which has improved workability. [Means for solving the problem]

[0007] The present invention relates to a method for manufacturing a liquid crystal display device, comprising: A double-acting hydraulic cylinder, a first cylinder case that is accommodated in the base with an upper portion protruding from the opening; a first piston accommodated in the first cylinder case; a second cylinder case fixed to the first piston and movable along an axis of the first cylinder case; a second piston accommodated in the second cylinder case; a double-acting hydraulic cylinder having a piston rod fixed to the second piston and movable along an axis of the second cylinder case that is aligned with an axis of the first cylinder case; A hydraulic source that supplies hydraulic oil to the double-acting hydraulic cylinder; A cylindrical support body for supporting a wheel, the cylindrical support body being placed on the placement surface; A pressing body that is placed on a solid tire placed on the wheel or the tire attached to the wheel, the pressing body having a pressing ring portion having a larger diameter than the support body and into which the support body can be inserted; a nut that is screwed onto a protruding portion of the piston rod that protrudes from the second cylinder case and prevents the pressing body from being displaced in a direction away from the mounting surface; Equipped with The first cylinder case is a solid tire mounting / removal device characterized in that it includes a positioning protrusion provided on the end face of the first cylinder case exposed from the opening, which positions the support body so that the axis of the support body is coaxial with the axis of the first cylinder case by fitting into the support body.

[0008] The present invention is also characterized in that the hydraulic power source further includes an oil passage configuration including a first oil passage that guides working oil of the hydraulic power source to the double-acting hydraulic cylinder so that the first cylinder case and the piston rod retract, and a second oil passage that guides working oil from the hydraulic power source to the double-acting hydraulic cylinder so that the first cylinder case and the piston rod extend.

[0009] In the present invention, the oil passage configuration portion further includes a pressure reducing valve that reduces the pressure of the working oil supplied to the double-acting hydraulic cylinder from the hydraulic power source via the first oil passage or the second oil passage.

[0010] The present invention is also characterized in that it further comprises a warning light which is turned on when the pressure of the hydraulic oil supplied from the hydraulic source to the double-acting hydraulic cylinder is 13 MPa or higher. Effect of the Invention

[0011] According to the present invention, a double-acting hydraulic cylinder is housed in a base. The base has a mounting surface, and an opening is provided in the mounting surface. The double-acting hydraulic cylinder has a first cylinder case, a first piston, a second cylinder case, a second piston, and a piston rod. The double-acting hydraulic cylinder can extend or retract the first cylinder case and the piston rod by hydraulic oil supplied from a hydraulic source. A positioning protrusion is provided on an end face of the first cylinder case exposed from the opening. The positioning protrusion can be fitted to the support, so that the support is positioned so that the axis of the support is coaxial with the axis of the first cylinder case by placing the support on the end face of the first cylinder case so that the positioning protrusion fits.

[0012] Therefore, it is no longer necessary for an operator to manually position the support body, improving workability. Because there is no deviation in the axis of the support body from the axis of the first piston, the axis of the wheel mounted on the support body can be made coaxial with the axis of the first cylinder case, and the tire mounted on the wheel can be pressed by the pressing body without being significantly deviated from the axis of the first cylinder case.

[0013] Also, according to the present invention, the hydraulic power source includes an oil passage configuration portion, and the oil passage configuration portion includes a first oil passage and a second oil passage. The first oil passage configures a path for hydraulic oil supplied from the hydraulic power source to the double-acting hydraulic cylinder so that the first cylinder case and the piston rod retract. The second oil passage configures a path for hydraulic oil supplied from the hydraulic power source to the double-acting hydraulic cylinder so that the first cylinder case and the piston rod extend. The first oil passage and the second oil passage are selectively switched. This allows the operation of the double-acting hydraulic cylinder to be easily switched in response to pressing or retracting the tire, improving convenience.

[0014] According to the present invention, the pressure of the hydraulic oil supplied from the hydraulic source to the double-acting hydraulic cylinder through the first or second oil passage can be reduced by the pressure reducing valve, and the pressure of the hydraulic oil can be made different depending on whether a large pressing force is required to mount the tire on the wheel, such as tires of large industrial vehicles, or a normal pressing force lower than the pressing force of tires of large industrial vehicles is sufficient to mount the tire on the wheel, such as tires of medium and small industrial vehicles. For example, in the case of tires of large industrial vehicles, high-pressure hydraulic oil that is not reduced by the pressure reducing valve can be supplied to the double-acting hydraulic cylinder, and in the case of tires of small and medium-sized industrial vehicles, medium-pressure hydraulic oil reduced by the pressure reducing valve can be supplied to the double-acting hydraulic cylinder. This suppresses the operation of the hydraulic source, saves energy, and improves economy.

[0015] Furthermore, according to the present invention, a warning light comes on when the hydraulic oil pressure reaches 13 MPa or higher, so that an operator can be notified that work is being performed using high-pressure hydraulic oil. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a solid tire mounting / removal device 1 according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a front view of the solid tire mounting / removal device 1. [Diagram 3] FIG. 2 is a plan view of the solid tire mounting / removal device 1. [Figure 4] FIG. 2 is a cross-sectional view showing the internal structure of a solid tire mounting / removal device 1. [Diagram 5] 3 is an enlarged cross-sectional view showing the support 33. FIG. [Figure 6] FIG. 2 is a developed connection diagram for explaining the electrical configuration of the solid tire mounting / removal device 1. [Figure 7] FIG. 2 is a hydraulic circuit diagram for explaining the configuration of a hydraulic system of the solid tire mounting / removal device 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] FIG. 1 is a perspective view of a solid tire mounting / removal device 1 according to an embodiment of the present invention, and FIG. 2 is a front view of the solid tire mounting / removal device 1. FIG. 3 is a plan view of the solid tire mounting / removal device 1. FIG. 4 is a cross-sectional view showing the internal structure of the solid tire mounting / removal device 1. FIG. 5 is an enlarged cross-sectional view showing the support 33. FIG. 6 is a developed connection diagram for explaining the electrical configuration of the solid tire mounting / removal device 1. FIG. 7 is a hydraulic circuit diagram for explaining the configuration of the hydraulic system of the solid tire mounting / removal device 1. In this embodiment, the tire T is a tire for an industrial vehicle such as a forklift, and is used to mount or remove a solid tire T, also called a puncture-free tire, having a tire diameter of 8 inches to 16 inches (hereinafter, sometimes simply referred to as a "tire"), onto or from a wheel W. The tire T is mounted on a wheel W. The maximum pressing force for pressing the tire T to remove the tire T from the wheel W when replacing the tire T is assumed to be 100 tons.

[0018] 1 to 7, the solid tire mounting / removal device 1 of this embodiment includes a base 4, a double-acting hydraulic cylinder CY1 including a piston rod 15, a hydraulic source 5, a cylindrical support 7, a pressing body 10, and a nut 9. A fall-prevention washer 9a for preventing the nut 9 from falling off is fixed to the upper end of the piston rod 15 by a bolt 9b. The base 4 has a flat mounting surface 3 with an opening 2 provided in the center. A positioning protrusion 3a is exposed from the opening 2. The hydraulic source 5 supplies hydraulic oil to the double-acting hydraulic cylinder CY1. The support 7 is placed on the mounting surface 3 and supports the wheel W. The pressing body 10 has a pressing ring portion 8, and is placed on a solid tire T placed on the wheel W or a tire T attached to the wheel W. The pressing ring portion 8 is larger in diameter than the support 7 and allows the support 7 to be inserted therein.

[0019] The base 4 is fixed on a base plate 16. A support 17 is vertically installed on the base plate 16, one end of an arm 18 is connected to the upper end of the support 17, and a lifting device 19, also called a winch, is hung on the other end of the arm 18. The lifting device 19 has a winding section 20, a first cord 21 and a second cord 22 that are wound up or wound down by the winding section 20, a hook member 23 connected to the tip of the first cord 21, a tire gripper 24 connected to the tip of the second cord 22, and a chain block 25 in which the first cord 21 is housed in a wound state. The first cord 21 is, for example, a chain, and the second cord 22 is, for example, a wire rope.

[0020] The support 17 is provided with an operation box 26 and a warning light 27. The operation box 26 is a sequence controller, and has a case 28, a pilot lamp 29, an on / off switch SW5 for the second motor M2 (see FIG. 7) provided in the hydraulic power source 5, a pressing force switching button 31, and an operation lever 32 for the double-acting hydraulic cylinder CY1. When the power of the solid tire mounting / removal device 1 is turned on, the pilot lamp 29 lights up to indicate that the solid tire mounting / removal device 1 is in operation. The warning light 27 is configured to light up when the pressure of the hydraulic oil supplied from the hydraulic power source 5 to the double-acting hydraulic cylinder CY1 is a high pressure of 13 MPa or more, and can notify an operator that the solid tire mounting / removal device 1 is in the high pressure mode and call for attention. Since the operator needs to operate the operation lever 32 while pressing the pressing force switching button 31, when mounting a large tire T on a wheel W, the operator needs to operate the operation lever 32 while pressing the pressing force switching button 31 with one hand in order to switch the solid tire mounting / removal device 1 from the normal pressure mode for normal or small tires to the high pressure mode. This allows the operator to recognize that the solid tire mounting / removal device 1 has been switched to the high pressure mode in which the tire T is pressed with a pressing force of 50 tons or more, and thus calls the operator's attention and improves safety. The warning light 27 may be configured to include a light emitting diode (LED) that emits red light as a light source.

[0021] 3, a support 33, which will be described later, is placed on a floor 99 on one side of the base 4, and a tire T, a wheel W, or a wheel with a tire is placed on the floor 99 on the other side of the base 4. Another support 7 is placed on the placement surface 3 of the base 4. The support 33 is used when a large tire T is mounted on a wheel W or when a large tire T is removed from a wheel W. The small support 7 is used when a small tire T is mounted on a wheel E or when a small tire T is removed from a wheel W.

[0022] Referring to FIG. 4, the double-acting hydraulic cylinder CY1 has a first cylinder case 11, a first piston 12, a second cylinder case 13, a second piston 14, and a piston rod 15. The first cylinder case 11 is housed in the base 4 with its upper portion protruding from the opening 2. The first piston 12 is housed in the first cylinder case 11. The second cylinder case 13 is fixed to the first piston 12 and is movable along an axis L1 of the first cylinder case 11. The second piston 14 is housed in the second cylinder case 13. The piston rod 15 is fixed to the second piston 14 and is movable along an axis L2 of the second cylinder case 13 which is in the same line as the axis L1 of the first cylinder case 11. The piston rod 15 has a protruding portion 15a of the piston rod 15 protruding from the second cylinder case 13, and an external thread is formed on the protruding portion 15a of the piston rod 15. The nut 9 is screwed onto the protruding portion 15a of the piston rod 15. The nut 9 prevents the pressing body 10 from being displaced in a direction away from the support surface 3.

[0023] The first cylinder case 11 includes a positioning protrusion 3a. The positioning protrusion 3a is provided on the end surface of the first cylinder case 11 exposed from the opening 2, and by fitting to the support 7, positions the support 7 so that the axis of the support 7 is coaxial with the axis L1 of the first cylinder case 11. The first cylinder case 11 includes a cylindrical cylinder tube 41, a first flange 43, and a second flange 44. The first flange 43 is liquid-tightly joined to one end of the cylinder tube 41, and has the above-mentioned mounting surface 3 and positioning protrusion 3a. The second flange 44 is liquid-tightly joined to the other end of the cylinder tube 41. The positioning protrusion 3a may be, for example, an annular shape, may be configured to be intermittently positioned in the circumferential direction, or may be configured by at least three convex portions.

[0024] The space within the first cylinder case 11 is liquid-tightly divided into a first pressure chamber S1 and a second pressure chamber S2 by the first piston 12. The first flange 43 has a first port P1 for supplying or discharging hydraulic oil, and a first passage 45 that connects the first pressure chamber S1 and the first port P1. The second flange 44 has a second port P2 for supplying or discharging hydraulic oil, and a second passage 46 that connects the second pressure chamber S2 and the second port P2.

[0025] The second cylinder case 13 has a long cylindrical cylinder tube 47, a short cylindrical first reinforcing ring 48, and a short cylindrical second reinforcing ring 49. The first reinforcing ring 48 is joined coaxially and liquid-tightly to one end of the cylinder tube 47. The second reinforcing ring 49 is joined coaxially and liquid-tightly to the other end of the cylinder tube 47. The space inside the cylinder tube 47 is partitioned by the second piston 14 into a first pressure chamber S11 and a second pressure chamber S12. The second cylinder case 13 is movable along the axis L1 inside the first cylinder case 11 together with the second piston 14, the first reinforcing ring 48, and the second reinforcing ring 49.

[0026] The base 4 is placed on a horizontal floor 99 in a factory or the like. The base 4 has a metal top plate 40 having a mounting surface 3, and a cylindrical metal peripheral wall 41a to one end of which the top plate 40 is fixed, for example, by welding.

[0027] Referring to FIG. 5, instead of the support 7 described above, a support 33 for carrying a large-diameter wheel W can be used. When the support 33 is placed on the mounting surface 3 of the first cylinder case 11, it is fitted into the positioning protrusion 3a and positioned. The support 33 has a cylindrical main body 35, an annular bottom plate 36, and a plurality of ribs 37. The bottom plate 36 is fixed to one end of the main body 35 by, for example, welding. The plurality of ribs 37 are fixed to the inner peripheral surface of the main body 35 by, for example, welding. The inner diameter of the bottom plate 36 is slightly larger than the outer diameter of the positioning protrusion 3a in the range of intersection. This allows the support 33 to be fitted into the positioning protrusion 3a and placed coaxially with the axis L1 of the first cylinder case 11 to support the large-diameter wheel W. In this way, the large-diameter wheel is guided by the support 33 so as to be coaxial with the axis L1 of the first cylinder case 11. Therefore, by the simple operation of placing the support body 33 on the support surface 3, the axis of the support body 33 is guided so as to be coaxial with the axis L1 of the first cylinder case 11, and the support body 33 can be positioned by a simple operation.

[0028] 6, the solid tire mounting / removal device 1 includes a control device 50. The control device 50 is provided in a case 5b provided on the back of a main body 5a of the hydraulic power source 5 (see FIG. 3). In the control device 50, electric wires 51R, 51S, 51T are connected to the R-phase, S-phase, and T-phase TRs, the S-phase terminal TS, and the T-phase terminal TT of a three-phase AC power source, respectively. These electric wires 51R, 51S, 51T are connected to the first motor M1 via an electromagnetic switch 53, and drive power is supplied to the first motor M1. Electric wires 52R, 52S, 52T for supplying drive power to the second motor M2 are connected to these electric wires 51R, 51S, 51T. The first motor M1 and the second motor M2 are, for example, three-phase induction motors. The first motor M1 is a drive motor for a hydraulic pump of the hydraulic power source 5, and the second motor M2 is a drive motor provided on a chain block of the lifting device 19 for winding up or down a first rope 21 (chain).

[0029] An electric wire 54R branches off and is connected to the electric wire 51R, and an electric wire 54S branches off and is connected to the electric wire 51S. An electric wire 55R is connected to the electric wire 54R via a jack J1. Electric wires 56-59, 74 are connected to the electric wire 55R, respectively. A plurality of jacks J2-J7 are interposed in the electric wire 54S. An electric wire 56 is connected to an electric wire 61 via a jack J8, and is connected to a jack J3. An electric wire 57 is connected to an electric wire 66 via a jack J9, and the electric wire 66 is connected to an electric wire 62 via a jack J12, and the electric wire 62 is connected to a jack J4. An electric wire 60 is connected to the jack J1, and the electric wire 60 is connected to the jack J2. The above-mentioned pilot lamp 29 is connected to the electric wire 60. An electromagnetic switch 68 is interposed in the electric wire 61. A fuse F1 is interposed in the electric wire 62.

[0030] Electric wire 58 is connected to electric wire 67 via jack J10, and electric wire 67 is connected to jack J12. Electric wire 73 branches off from electric wire 58, is connected to electric wire 69 via jack J11, is connected to electric wire 63 via jack J13, and is connected to jack J5. Electric wire 59 is connected to electric wires 71 and 64, and is connected to jack J6.

[0031] A first electromagnetic solenoid SoL1 is interposed in the electric wire 66. A fuse F2 is interposed in the electric wire 63. A second electromagnetic solenoid SoL2 is interposed in the electric wire 67. A third electromagnetic solenoid SoL3 is interposed in the electric wire 69. A relay 70 is interposed in the electric wire 64. A two-way monolever switch SW1 is interposed in each of the electric wires 57 and 58.

[0032] A control switch SW2 is interposed between each of the electric wires 58 and 73. A control switch SW3 is interposed between the electric wire 56. A pressure switch SW4 is interposed between the electric wire 71. The electric wire 74 is connected to the electric wires 72 and 65, and is connected to the jack J7. A capacitor C is interposed between the electric wire 74. A warning light 27 is interposed between the electric wire 72. A fuse F3 is interposed between the electric wire 65.

[0033] 7, the hydraulic source 5 includes an oil tank TK in which hydraulic oil is stored, a piston pump 80, a strainer 81, an air breather 82, an oil level gauge 83, a pressure gauge 84, and the above-mentioned first motor M1. The solid tire mounting / removal device 1 includes a flow path configuration unit 30 that controls the hydraulic oil supplied to the double-acting hydraulic cylinder CY1 from the above-mentioned hydraulic source 5. The discharge port P11 and the return port P12 of the hydraulic source 5 are connected to the first port P1 and the second port P2 of the double-acting hydraulic cylinder CY1 by the flow path configuration unit 30.

[0034] The flow path configuration unit 30 includes a first solenoid operated valve V1, a second solenoid operated valve V2, a pressure reducing valve V3, a relief valve V4, and the above-mentioned pressure switch SW4. The first solenoid operated valve V1 is configured as a four-port three-position solenoid valve having ports a1, a2, b1, and b2. The second solenoid operated valve V2 is configured as a four-port three-position solenoid valve having ports a3, a4, b3, and b4, similar to the first solenoid operated valve V1. The pressure reducing valve V3 is configured as a pilot differential type pressure reducing valve. The relief valve V4 is configured as a direct acting type relief valve.

[0035] The first solenoid operated valve V1 has inlet ports a1, a2 and outlet ports b1, b2. The first solenoid operated valve V1 can be switched by an electromagnetic solenoid to one of three positions: a first position where the port a1 and the port b1 are connected and the port a2 and the port b2 are connected, a second position where the port a1 and the port b2 are connected and the port a2 and the port b1 are connected, and a neutral position where all the ports a1, a2, b1, and b2 are closed. The second solenoid operated valve V2 has inlet ports a3, a4 and outlet ports b3, b4. The second solenoid-operated valve V2 is configured to be switchable by an electromagnetic solenoid to one of three positions: a first position in which port a3 is connected to port b3 and port a4 is connected to port b4; a second position in which port a3 is connected to port b4 and port a4 is connected to port b3; and a neutral position in which all of the ports a3, a4, b3, and b4 are closed.

[0036] The hydraulic source 5 includes a flow path configuration unit 30. The flow path configuration unit 30 includes a first oil path and a second oil path. The first oil path supplies hydraulic oil from the hydraulic source 5 to the double-acting hydraulic cylinder CY1 so that the first cylinder case 11 and the piston rod 15 retract. The second oil path guides hydraulic oil from the hydraulic source 5 to the double-acting hydraulic cylinder CY1 so that the first cylinder case 11 and the piston rod 15 extend. The pressure reducing valve V3 reduces the pressure of the hydraulic oil supplied to the double-acting hydraulic cylinder CY1 from the piston pump 80 via the first oil path or the second oil path.

[0037] The hydraulic source 5 has a discharge port P11 that discharges hydraulic oil and a return port P12 that takes in hydraulic oil. A pipe 85 is connected to the discharge port P11, and a pipe 86 is connected to the return port P12. A pipe 87 is connected to the pipe 85, and hydraulic oil from the hydraulic source 5 is guided to the pressure reducing valve V3 through the pipes 85 and 87. The pressure reducing valve V3 reduces the pressure of the 15 MPa hydraulic oil that flows in from the pipe 87 to 9 MPa. A pipe 89 is connected to the pressure reducing valve V3. The pipe 89 is connected to the port a1 of the first solenoid operated valve V1. A pipe 88 is connected to the port a2 of the first solenoid operated valve V1. The pipe 88 is connected to the pipe 86. The pipe 88 is also connected to the return port of the pressure reducing valve V3 by a pipe 90.

[0038] The hydraulic oil reduced in pressure by the pressure reducing valve V3 is supplied to the port a1 of the first solenoid operated valve V1 through a pipe 89. A pipe 91 is connected to the port b1 of the first solenoid operated valve V1. A pipe 92 is connected to the port b2 of the first solenoid operated valve V1. The pipes 91 and 88 are connected by a pipe 93, and a relief valve V4 is interposed in the pipe 93. The pipe 92 is connected to the first port P1 of the double acting hydraulic cylinder CY1, and the pipe 91 is connected to the second port P2 of the double acting hydraulic cylinder CY1. A pipe 94 is connected to the pipe 92, a pipe 95 is connected to the pipe 91, a pipe 96 is connected to the pipe 88, and a pipe 97 is connected to the pipe 87.

[0039] The hydraulic oil at the discharge port P11 is supplied to the port a3 of the second solenoid operated valve V2 via the pipes 85, 87, and 97. The port a4 of the second solenoid operated valve V2 is connected to the return port P12 via the pipes 96, 88, and 86. The port b3 of the second solenoid operated valve V2 is connected to the pipe 95. The port b4 of the second solenoid operated valve V2 is connected to the pipe 94. The pressure switch SW4 is connected to the pipe 92. A pressure change of the hydraulic oil at the port b2 of the first solenoid operated valve V1 is transmitted via this pipe 92, and the switching mode changes.

[0040] A case where a small tire T is mounted on a wheel W will be described. The support 7 is placed on the mounting surface 3 of the base 4 while being fitted into the positioning protrusion 3a. The wheel W is placed on the support 7, and the small tire T is placed on the wheel W. The pressing body 10 is inserted into the piston rod 15, and the nut 9 is screwed onto the protruding portion 15a. When an operator operates the on / off changeover switch SW5 of the operation box 26 (see FIG. 1) to switch from off to on, the power is turned on to the hydraulic source 5, and hydraulic oil is supplied from the discharge port P11 to the pipes 85 and 87. Next, when the operation lever 32 is angularly displaced downward, the first solenoid operated valve V1 is displaced from the neutral position to the second position by the control device 50, and the high-pressure hydraulic oil discharged from the discharge port P11 to the pipe 87 is depressurized by the pressure reducing valve V3 and supplied to the pipe 89. The low-pressure hydraulic oil in the pipe 89 is supplied to the first port P1 of the double-acting hydraulic cylinder CY1 through the pipe 92. At this time, the second port P2 of the double-acting hydraulic cylinder CY1 is connected to the oil tank TK through the pipe 91, the ports b1 and a2 of the first solenoid operated valve V1, and the pipes 88 and 86, and the hydraulic oil discharged from the second port P2 is returned to the oil tank TK. In addition, the second solenoid operated valve V2 is kept in a neutral position, and the connection between the pipes 94 and 95 and the pipes 96 and 97 is closed, forming the first oil passage. In this way, the high-pressure hydraulic oil discharged to the discharge port P11 of the hydraulic source 5 is reduced in pressure, and the second port P2 of the double-acting hydraulic cylinder CY1 is opened to the oil tank TK, so that the piston rod 15 is retracted, and the small tire T is pressed toward the wheel W on the support 7 by the pressing body 10 and mounted. When removing a small tire T from the wheel W, the small tire T can be removed from the wheel W by placing the wheel W with the tire on the support 7 and performing the same operation.

[0041] A case where a large tire T is mounted on a wheel W will be described. The support 33 is placed on the mounting surface 3 of the base 4 while being fitted into the positioning protrusion 3a. The wheel W is placed on the support 33, and the large tire T is placed on the wheel W. The pressing body 10 is inserted into the piston rod 15, and the nut 9 is screwed onto the protruding portion 15a. When an operator presses the pressing force switching button 31 (see FIG. 1), the first solenoid operated valve V1 is displaced from the second position to the neutral position, the pipe 89 is closed, and the supply of low-pressure hydraulic oil from the pipe 92 to the first port P1 is cut off. At the same time, the second solenoid operated valve V2 is displaced from the neutral position to the second position. As a result, the high-pressure hydraulic oil discharged from the discharge port P11 of the hydraulic source 5 to the pipe 85 passes through the pipe 97 to the ports a3 and b4 of the second solenoid operated valve V2, and is supplied from the pipes 94 and 92 to the first port P1. At this time, the second port P2 passes through the relief valve V4 of the pipe 91 to the pipe 93, and is connected to the pipes 88 and 86 and the return port P12, and the hydraulic oil discharged from the second port P2 is returned to the oil tank TK. In this way, the high-pressure hydraulic oil discharged to the discharge port P11 of the hydraulic source 5 is supplied to the first port P1 of the double-acting hydraulic cylinder CY1 while remaining at high pressure, and the hydraulic oil at the second port P2 is returned to the oil tank TK, so that the piston rod 15 retracts under high pressure, and the large tire T is pressed by the pressing body 10 toward the wheel W on the support body 33 and mounted thereon. When removing a large tire T from the wheel W, the wheel W with the tire attached thereto is placed on the support 7, and the large tire T can be removed from the wheel W by carrying out the same operation.

[0042] Also, when the operator performs an upward angular displacement operation of the operating lever 32, the control device 50 moves the first solenoid operated valve V1 from the neutral position to the first position, and maintains the second solenoid operated valve V2 in the neutral position. The low-pressure hydraulic oil discharged from the pressure reducing valve V3 to the pipe 89 passes through the ports a1 and b1 of the first solenoid operated valve V1, and is supplied from the pipe 91 to the second port P2 of the double-acting hydraulic cylinder CY1, thereby forming a second oil passage. By forming the second oil passage in this way by the flow passage forming part 30, the low-pressure hydraulic oil of the hydraulic source 5 is supplied to the second port P2 of the double-acting hydraulic cylinder CY1, thereby extending the piston rod 15 and returning it to the initial position. Thereafter, the nut 9 and the pressing body 10 are removed, and the wheel with tire W, or the tire T and the wheel W, are removed.

[0043] According to this embodiment, the double-acting hydraulic cylinder CY1 is accommodated in the base 4. The base 4 has a mounting surface 3, and an opening 2 is provided in the mounting surface 3. The double-acting hydraulic cylinder CY1 has a first cylinder case 11, a first piston 12, a second cylinder case 13, a second piston 14, and a piston rod 15. The double-acting hydraulic cylinder CY1 can extend or retract the first cylinder case 11 and the piston rod 15 by hydraulic oil supplied from a hydraulic source 5. A positioning protrusion 3a is provided on the end surface of the first cylinder case 11 exposed from the opening 2. The positioning protrusion 3a can be fitted to the support 7, so that the support 7 is positioned so that the axis of the support 7 is coaxial with the axis L1 of the first cylinder case 11 by placing the support 7 on the end surface of the first cylinder case 11 so that the positioning protrusion 3a fits. Therefore, it is not necessary for an operator to manually position the support 7, and workability is improved. Since there is no deviation in the axis of the support body 7 from the axis L1 of the first piston 12, the axis of the wheel W mounted on the support body 7 can also be made coaxial with the axis L1 of the first cylinder case 11, and the tire T mounted on the wheel W can be pressed by the pressing body 10 without being significantly deviated from the axis L1 of the first cylinder case 11.

[0044] According to this embodiment, the hydraulic power source 5 includes a flow path configuration unit 30, and the flow path configuration unit 30 includes a first oil path and a second oil path. The first oil path configures a path of hydraulic oil supplied from the hydraulic power source 5 to the double-acting hydraulic cylinder CY1 so that the first cylinder case 11 and the piston rod 15 are retracted. The second oil path configures a path of hydraulic oil supplied from the hydraulic power source 5 to the double-acting hydraulic cylinder CY1 so that the first cylinder case 11 and the piston rod 15 are extended. The first oil path and the second oil path can be selectively switched. This allows the operation of the double-acting hydraulic cylinder CY1 to be easily switched in response to the pressing or retracting of the tire T, improving convenience.

[0045] According to the present embodiment, the pressure of the hydraulic oil supplied from the hydraulic source 5 to the double-acting hydraulic cylinder CY1 through the first oil passage or the second oil passage can be reduced by the pressure reducing valve V3, and the pressure of the hydraulic oil can be made different depending on whether a large pressing force is required to mount the tire T on the wheel W, such as a tire for a large industrial vehicle, or a pressing force lower than that of the tire T of a large industrial vehicle is sufficient to mount the tire T on the wheel W, such as a tire T for a medium-sized or small industrial vehicle. For example, in the case of a tire T of a large industrial vehicle, high-pressure hydraulic oil of, for example, 70 tons or more that is not reduced by the pressure reducing valve V3 can be supplied to the double-acting hydraulic cylinder CY1, and in the case of a tire T of a small or medium-sized industrial vehicle, medium-pressure hydraulic oil of, for example, less than 50 tons that is reduced by the pressure reducing valve V3 can be supplied to the double-acting hydraulic cylinder CY1. This suppresses unnecessary high-pressure operation of the hydraulic source 5, thereby saving energy and improving safety.

[0046] Furthermore, according to this embodiment, when the pressure of the hydraulic oil detected by the pressure gauge 84 reaches 13 MPa or higher, the warning light 27 turns on, thereby notifying the operator that work is being performed using high-pressure hydraulic oil.

[0047] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, and various modifications and improvements are possible within the scope of the gist of the present invention. It goes without saying that all or part of the components of each of the above-mentioned embodiments can be appropriately combined within the scope of not contradicting each other. [Explanation of symbols]

[0048] 1. Solid tire mounting and dismounting device 2 aperture 3. Placement surface 3a Positioning protrusion 4 Foundation 5 Hydraulic source 7,33 Support 8 Pressing ring part 9 Nut 10 Pressing body 11 First cylinder case 12 First piston 13 Second cylinder case 14 Second piston 15 Piston rod 15a Projecting part 16 Base plate 17 Posts 18 Arm 19 Lifting device 20 Winding section 21 First line 22 Second line 23 Hook member 24 Tire gripper 25 Chain block 26 Operation Box 27 Warning light 28 cases 29 Pilot Lamp 31 Pressure change button 32 Operating lever CY1 Double acting hydraulic cylinder J1~J13 Jack L1 Axis of the first cylinder case L2 Axis of second cylinder case SW5 On / Off switch T Tire V1 First solenoid valve V2 Second solenoid valve V3 Pressure Reducing Valve W Wheel

Claims

1. A base having a flat mounting surface with an opening; A double-acting hydraulic cylinder, a first cylinder case that is accommodated in the base with an upper portion protruding from the opening; a first piston accommodated in the first cylinder case; a second cylinder case fixed to the first piston and movable along an axis of the first cylinder case; a second piston accommodated in the second cylinder case; a double-acting hydraulic cylinder having a piston rod fixed to the second piston and movable along an axis of a second cylinder case that is aligned in the same line as an axis of the first cylinder case; A hydraulic source that supplies hydraulic oil to the double-acting hydraulic cylinder; A cylindrical support body for supporting a wheel, the cylindrical support body being placed on the placement surface; A pressing body that is placed on a solid tire placed on the wheel or the tire attached to the wheel, the pressing body having a pressing ring portion having a larger diameter than the support body and into which the support body can be inserted; a nut that is screwed onto a protruding portion of the piston rod that protrudes from the second cylinder case and that prevents the pressing body from being displaced in a direction away from the mounting surface; Equipped with a first cylinder case that is exposed from the opening and that includes a positioning protrusion provided on an end surface of the first cylinder case that is exposed from the opening, the positioning protrusion fitting to the support body so that the axis of the support body is coaxial with the axis of the first cylinder case.

2. 2. The solid tire mounting / removal device according to claim 1, wherein the hydraulic power source further includes an oil passage configuration including a first oil passage that guides hydraulic oil of the hydraulic power source to the double-acting hydraulic cylinder so that the first cylinder case and the piston rod retract, and a second oil passage that guides hydraulic oil from the hydraulic power source to the double-acting hydraulic cylinder so that the first cylinder case and the piston rod extend.

3. 3. The solid tire mounting / removal device according to claim 2, wherein the oil passage configuration portion further includes a pressure reducing valve that reduces a pressure of the hydraulic oil supplied from the hydraulic power source through the first oil passage or the second oil passage to the double-acting hydraulic cylinder.

4. 3. The solid tire mounting / removal device according to claim 1, further comprising a warning light which is turned on when the pressure of the hydraulic oil supplied from the hydraulic power source to the double-acting hydraulic cylinder is 13 MPa or higher.

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