JPH04117900U - hydraulic lift device - Google Patents

Abstract

(57) [Summary] [Purpose] To enable the safe lowering of a loading platform by remote control in an emergency such as a power outage in an automobile maintenance lift, and to easily configure a manual operation mechanism for this purpose. [Structure] Two double-acting hydraulic cylinders 12 and 13 are provided corresponding to the two columns, and these are connected in series to a hydraulic pump 27. A hydraulic unit 16 that drives the hydraulic cylinders 12 and 13 is provided with a switching valve 20 that switches the pressure oil supply pipe 17 to an ascending pipe 18 and a descending pipe 19. A pilot operated check valve 21 is provided in the ascending conduit 18 and connected to the descending conduit 19 via a pilot conduit 24 . The pilot conduit 24 is provided with a manual operation terminal 5 to which the joint 9 of the external pressurizing means 6 can be connected, and in an emergency, the pilot operated check valve 21 is opened by the pressure of the external pressurizing means 6, and the hydraulic cylinders 12 and 13 are closed. The pressure oil is returned to the tank 30 via the riser line 18.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is useful for hydraulic lift devices such as automobile maintenance lifts, especially double-acting hydraulic This invention relates to a hydraulic lift device that raises and lowers a loading platform using a cylinder.

0002

[Conventional technology]

Conventionally, as this type of hydraulic lift device, a two-post vehicle as shown in FIGS. 6 to 8 has been used. Maintenance lifts are known. In each figure, 12 and 13 raise and lower the vehicle platform 3. Two hydraulic cylinders, 16 is a hydraulic unit that drives each hydraulic cylinder 12, 13 This hydraulic unit 16 includes a hydraulic pump 27, a check valve 28, and a switching valve 20. It is provided. In the lift of FIG. 6, each hydraulic cylinder 12, 13 is a hydraulic port. In the lift of FIG. 7, each hydraulic cylinder 12, 13 are connected in series. The hydraulic unit 16 in FIG. 8 has a manual valve 39. A bypass line 40 is provided. Both lifts are equipped with hydraulic cylinders. 12 and 13 are configured so that they can be raised at the A position of the switching valve 20 and lowered at the B position. ing.

0003

[Problem that the idea aims to solve]

By the way, in this type of hydraulic lift device, the hydraulic pump 27 When the vehicle stops, it is necessary to lower the vehicle platform 3 manually, but as shown in Fig. 6. In the case of the lift device shown in Figure 7, do not loosen the piping near the hydraulic cylinders 12 and 13. How did you deal with it? However, since this work is performed under the vehicle platform 3, This was extremely dangerous, causing the vehicle to fall. On the other hand, the lift device in FIG. Pressure oil in the hydraulic cylinders 12 and 13 is released by operating the manual valve 39 at a remote location. However, according to this, the hydraulic unit 16 has a bypass dedicated to manual operation. It is necessary to permanently install the path pipe 40, which not only complicates the circuit configuration, but also requires manual If oil leaks from the valve 39, the vehicle platform 3 may fall naturally. was there.

0004 Therefore, the challenge of this invention was to be able to lower the loading platform safely by remote control. To provide a hydraulic lift device for which a manual operation mechanism can be easily configured. It is in.

[0005]

[Means to solve the problem]

In order to solve the above problems, the hydraulic lift device of this invention raises and lowers the loading platform. Equipped with a double-acting hydraulic cylinder and a hydraulic unit that drives the hydraulic cylinder. The hydraulic unit is equipped with a switching valve that switches the pressure oil supply line to an ascending line and a descending line. A pilot-operated check valve is installed on the rising pipe, and the pilot-operated check valve and Connect the descending pipe with a pilot pipe, and connect this pilot pipe to an external pressurizing means. It is configured with a manual operation terminal that can be connected.

[0006]

[Effect]

According to the hydraulic lift device of this invention, when the loading platform is raised, the switching valve supplies pressure oil. The pipe is switched to the rising pipe, and pressure oil flows to the hydraulic cylinder via the pilot-operated check valve. The discharge oil of the hydraulic cylinder returns to the tank through the descending line. In addition, when the loading platform is lowered, the switching valve switches the pressure oil supply pipe to the descending pipe. Pressure oil in the downhill pipe passes through the pilot pipe to open the pilot-operated check valve. Then, the pressure oil in the descending pipe flows into the hydraulic cylinder and descends, causing the discharge of the hydraulic cylinder to Output oil returns to the tank through a pilot-operated check valve and a rising pipe.

[0007] If the hydraulic pump stops due to a power outage, etc., the manual operation installed in the pilot pipe An external pressurizing means is connected to the operation terminal, and the pilot operation is performed by the pressure of this external pressurizing means. The check valve is opened and the pressure oil in the hydraulic cylinder returns to the tank through it. Koto The manual operation terminal is provided on the hydraulic unit, so the operator can The loading platform can be moved by remote control using a hydraulic unit separate from the lift body without having to enter the lift body. can be safely descended. In addition, a normal lifting circuit can be used and externally applied in an emergency. Since it is operated by pressure means, a bypass line dedicated to manual operation is always provided in the hydraulic unit. There is no need to install one, and the circuit configuration can be simplified and costs can be reduced. In addition, during normal times In this case, the manual operation terminal is closed by a plug or the like.

[0008]

【Example】

The following is an example of a two-post car maintenance lift based on this idea. The explanation will be based on 4. Figure 1 shows the hydraulic unit of a two-post car maintenance lift. 2 is a partial sectional view of the manifold shown in FIG. 1, and FIG. Figure 4 shows the overall configuration of the two-post car maintenance lift. FIG.

[0009] In Fig. 4, 1 is the machine frame of the automobile maintenance lift, and 35 is the machine frame installed in the machine frame 1. Guide, 2 is two columns supported by guide 35 so as to be able to rise and fall freely, 3 is the upper end of column 2 12 is a driving hydraulic cylinder that raises and lowers one of the pillars 2, 13 is a vehicle mounting base fixed to A driven hydraulic cylinder 16 lifts and lowers the other support column 2, and a driven hydraulic cylinder 16 is connected to each hydraulic cylinder 12, 13. The driving hydraulic unit 37 is an operation switch connected to the hydraulic unit 16. Ru. The hydraulic unit 16 is installed laterally away from the vehicle platform 3. ing.

0010 As shown in FIGS. 1 and 3, a driving hydraulic cylinder 12 and a driven hydraulic cylinder 13 are each configured as a double-acting type, and are connected in series via a conduit 14. The hydraulic unit 16 has a pressure oil supply pipe 17 cut into an ascending pipe 18 and a descending pipe 19. A switching valve 20 for switching is provided. Manifold 15 has a pilot operated check valve 21, a flow control valve 22 and a check valve 23 are arranged and provided on the ascending pipe 18. . Pilot-operated check valve 21 is connected to descending line 19 via pilot line 24 has been done. 27 is a hydraulic pump, 28 is a check valve, 29 is a relief valve, and 30 is a tank. It is

[0011] As shown in FIG. 1, a manual operation terminal 5 is connected to the manifold 15 in the pilot conduit 24. The manual operation terminal 5 is provided with an opening on the outside surface, and in an emergency, external pressure can be applied to this manual operation terminal Means 6 is connected. The external pressurizing means 6 is a hydraulic or pneumatic external pressurizing source (not shown). a portable hose 8 extending from the (omitted) and a joint 9 detachably connected to the manual operation terminal 5. , a steel ball 10 that closes the descending pipe line 19, and a spring 11 that presses it in the closing direction. It is composed of. Note that in normal times, as shown in FIG. 2, the manual operation terminal 5 is closed by a recessed plug 7.

0012 Next, we will explain the operation of the two-post car maintenance lift configured as above. Ru. During normal operation, when the up button of the operation switch 37 is pressed, the hydraulic pump 27 is rotated, the switching valve 20 is switched to the A position, and the pressure oil supply pipe 17 is switched to the ascending pipe 1. Connected to 8. Pressure oil discharged from the hydraulic pump 27 passes through the pilot-operated check valve 2. 1. It is supplied to the drive hydraulic cylinder 12 via the check valve 23. This allows the drive As the piston 12a of the hydraulic cylinder 12 is raised, the driving hydraulic cylinder 1 The piston 13a of the driven hydraulic cylinder 13 is also raised by the discharged oil of No.2. and The oil discharged from the driven hydraulic cylinder 13 returns to the tank 30 via the descending pipe 19.

[0013] Also, during normal operation, when the down button of the operation switch 37 is pressed, the switching valve 20 is switched to the B position, the pressure oil supply pipe 17 is connected to the descending pipe 19, and the hydraulic pump Pressure oil discharged from the pipe 27 enters the descending pipe 19 side. Then, the pressure in the descending pipe 19 A portion of the oil passes through the pilot line 24 to the pilot of the pilot operated check valve 21. port and opens its pilot-operated check valve 21. This increases Since the pipe line 18 is opened, pressure oil in the descending pipe line 19 is supplied to the driven hydraulic cylinder 13. The piston 13a is pushed down, and the oil discharged from the driven hydraulic cylinder 13 causes the piston 13a to be pushed down. The piston 12a of the drive hydraulic cylinder 12 is also pushed down. And drive hydraulic pressure The oil discharged from the cylinder 12 is supplied to the flow rate control valve 22, the pilot-operated check valve 21, and the rising pipe. 18 and returns to tank 30. In addition, during normal operation, it is buried in manual operation terminal 5. Since the included plug 7 is installed, the pilot pressure from the descending pipe 19 is The lot operation check valve 21 can be operated without any trouble.

[0014] On the other hand, when lowering the vehicle platform 3 in an emergency such as a power outage, an external The joint 9 of the pressurizing means 6 is connected, and the descending pipe 19 is connected via the spring 11 by the steel ball 10. will be closed. In this state, pilot pressurized oil or pressurized air from the portable hose 8. When introduced into the pipe line 24, the pilot operated check valve 21 is opened due to the pressure. The pressure oil in the driving hydraulic cylinder 12 and the driven hydraulic cylinder 13 passes through the rising pipe 18. The vehicle then returns to the tank 30, and the support column 2 and vehicle platform 3 are lowered. At this time, the manual operation terminal 5 is provided on the manifold 15 of the hydraulic unit 16, unlike conventional , the hydraulic unit can be moved away from the lift body without the need for the operator to enter the underside of the vehicle-mounted platform 3. The vehicle platform 3 can be safely lowered by remote control at step 16. In addition, the normal lifting circuit and is operated by external pressurizing means 6 in an emergency, so the hydraulic unit There is no need to permanently install a bypass line exclusively for manual operation on 16, simplifying the circuit configuration. It also becomes possible to reduce costs.

[0015] In addition, in the above embodiment, the present invention was embodied in a two-post car maintenance lift. The present invention can also be applied to a one-post automobile maintenance lift. Figure 5 shows one example of this invention. It is a hydraulic circuit diagram of a one-post automobile maintenance lift showing an application example, and in the figure, 32 is a double-acting hydraulic cylinder, and the hydraulic unit 16 that drives it includes the above-mentioned actual hydraulic cylinder. A switching valve 20, a pilot-operated check valve 21, etc. similar to those in the example are provided, and the pilot The operating check valve 21 is connected to the descending pipe 19 via a pilot pipe 24 and The pilot conduit 24 is provided with a manual operation terminal 5 to which an external pressurizing means 6 can be connected. There is. Therefore, according to this embodiment, in a one-post automobile maintenance lift, the upper The same effects as in the embodiment described above can be obtained. In addition, this idea is limited to lifts for automobile maintenance. The loading platform must be lowered manually in case of an emergency. The structure of each part may be modified without departing from the spirit of the invention, such as application to various types of hydraulic lift equipment. It is also possible to change the structure appropriately and embody it.

[0016]

[Effect of the idea]

As detailed above, according to this invention, external pressurizing means can be used in emergencies such as power outages. A manual operation terminal for connection is provided on the hydraulic unit, so the operator can access the bottom of the loading platform. The loading platform can be lowered safely by remote control without the need for manual operation. There is no need to permanently install a bypass pipe, which simplifies the circuit configuration and reduces costs. It has the excellent effect of

[Brief explanation of drawings]

FIG. 1 is a sectional view of a manifold substantially showing a hydraulic unit of a two-post automobile maintenance lift according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the manifold of FIG. 1;

FIG. 3 is a hydraulic circuit diagram of the hydraulic unit of FIG. 1;

FIG. 4 is a front view showing the overall configuration of a two-poster automobile maintenance lift.

FIG. 5 is a hydraulic circuit diagram showing an example of application of this invention.

FIG. 6 is a hydraulic circuit diagram showing an example of a conventional hydraulic lift device.

FIG. 7 is a hydraulic circuit diagram showing another example of a conventional hydraulic lift device.

FIG. 8 is a hydraulic circuit diagram showing another example of a conventional hydraulic lift device.

[Explanation of symbols]

1. Machine frame, 2. Strut, 3. Vehicle mounting base, 5. Manual operation terminal, 6. External pressure means, 7. Embedded plug,
8. Portable hose, 9. Coupling, 10. Steel ball, 11.
・Spring, 12.. Drive hydraulic cylinder, 13.. Driven hydraulic cylinder, 14.. Pipe line, 15.. Manifold, 16.
・Hydraulic unit, 17. Pressure oil supply pipe, 18. Ascending pipe, 19. Descending pipe, 20. Switching valve, 21. Pilot operated check valve, 22. Flow rate control valve, 23.・・Check valve, 24・・Pilot line, 27・・Hydraulic pump,
28...Check valve, 29...Relief valve, 30...Tank, 32...Hydraulic cylinder, 35...Guide, 37...
Operation switch.

Claims (1)

[Scope of utility model registration request] 1. A double-acting hydraulic cylinder for raising and lowering a loading platform, and a hydraulic unit for driving the hydraulic cylinder, and a pressure oil supply pipe to the hydraulic unit is switched to an ascending pipe and a descending pipe. A switching valve is provided, a pilot-operated check valve is provided on the rising pipe, the pilot-operated check valve and the descending pipe are connected by a pilot pipe, and the pilot pipe is connected to an external pressurizing means. A hydraulic lift device characterized by being provided with a manual operation terminal.