CN215479411U

CN215479411U - Hydraulic driving device

Info

Publication number: CN215479411U
Application number: CN202120978639.2U
Authority: CN
Inventors: 李金岭; 王刚; 李振启; 郝永虎; 张型中; 梁玉
Original assignee: Kaifeng Qiangli Group Maogu Technology Co ltd
Current assignee: Kaifeng Qiangli Group Maogu Technology Co ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2022-01-11
Anticipated expiration: 2031-05-10

Abstract

The utility model relates to a hydraulic driving device which comprises an oil tank, wherein a jack is arranged on the outer side of the oil tank, the jack comprises a jack oil inlet pipe and a jack oil outlet pipe, a first oil delivery pipe and a second oil delivery pipe are arranged at the bottom of the oil tank, a piston pump is arranged on the first oil delivery pipe, a gear pump is arranged on the second oil delivery pipe, the tail end of the first oil delivery pipe is communicated with the jack oil inlet pipe, the jack oil outlet pipe is communicated with the top of the oil tank through a first oil return pipe, the tail end of the first oil delivery pipe is communicated with the tail end of the second oil delivery pipe between the piston pump and the tail end of the first oil delivery pipe, and a one-way valve is arranged on the second oil delivery pipe between the tail end of the second oil delivery pipe and the gear pump. The utility model improves the operation speed of the output end of the jack before the large-volume hydraulic jack works under a large load, is convenient to adjust and use and has wide market prospect.

Description

Hydraulic driving device

Technical Field

The utility model relates to the field of hydraulic drive, in particular to a hydraulic drive device.

Background

The jack is divided into a mechanical jack and a hydraulic jack, and the principles are different. In principle, hydraulic jacks are based on the pascal principle, i.e. the pressure is uniform throughout the liquid, so that in a balanced system the pressure exerted on a smaller piston is smaller, while the pressure exerted on a larger piston is also larger, thus keeping the liquid still. Different pressures at different ends can be obtained by the transfer of liquid, so that a change can be achieved. The common hydraulic jack uses the principle to achieve the force transmission. The mechanical jack adopts a mechanical principle, a handle is pulled repeatedly, a claw pushes a ratchet wheel to rotate in a clearance mode, a bevel pinion drives a bevel pinion to rotate a lifting screw rod, and therefore a lifting sleeve is lifted or lowered to achieve the function of lifting tension. But is not as simple as a hydraulic jack.

The hydraulic jack is commonly used in the prestress industry when tensioning operation is carried out, the large-volume hydraulic jack can be used when the volume of a tensioned object is large, and a piston pump is mostly adopted as an oil pump for conventionally driving the large-volume hydraulic jack because the load of the piston pump is large; however, just because the oil quantity delivered by the piston pump in unit time is too small, the output end of the large-volume hydraulic jack moves too slowly before the large-load hydraulic jack works, so that a worker needs to wait for a long time on site before the large-volume hydraulic jack works under the large load, the working efficiency is low, and precious working time cannot be effectively utilized.

Disclosure of Invention

Aiming at the defects in the prior art, the utility model provides the hydraulic driving device which can shorten the operation time of the output end of the jack before the large-volume hydraulic jack works under a large load so as to improve the working efficiency, and the hydraulic driving device is used for overcoming the defects in the prior art.

The technical scheme adopted by the utility model is as follows: the utility model provides a hydraulic drive device, includes the oil tank, the outside of oil tank is provided with the jack, and the jack includes that the jack advances oil pipe and the ejecting oil pipe of jack, the bottom of oil tank be provided with first defeated oil pipe and the defeated oil pipe of second, be provided with the piston pump on the first defeated oil pipe, the defeated oil pipe of second on be provided with the gear pump, first defeated oil pipe the end with the jack advance oil pipe and be linked together, the top of the ejecting oil pipe of jack and oil tank be linked together through first time oil pipe, the end of first defeated oil pipe between end and the piston pump of first defeated oil pipe is linked together with the end of the defeated oil pipe of second, is provided with the check valve on the defeated oil pipe of second between the end of the defeated oil pipe of second and the gear pump.

Preferably, one side of the second oil pipeline is provided with a hydraulic control reflux valve, the hydraulic control reflux valve comprises a reflux valve body, a first piston, a piston connecting rod and a second piston are sequentially arranged in the reflux valve body along one end of the reflux valve body towards the other end of the reflux valve body, one end of the reflux valve body close to the first piston and the first oil pipeline between the tail end of the second oil pipeline and the piston pump are communicated through a reflux valve driving pipe, one end of the reflux valve body close to the second piston is provided with a threaded rod, the first end of the threaded rod positioned on the inner side of the reflux valve body is provided with a pressure adjusting plate, a spring is arranged between the pressure adjusting plate and the second piston, a reflux valve oil inlet pipe and a reflux valve oil outlet pipe are arranged on the reflux valve body connected with the second piston, the second oil pipeline between the gear pump and the one-way valve is communicated with the reflux valve oil inlet pipe through a fourth oil return pipe, the oil outlet pipe of the reflux valve is communicated with the top of the oil tank through a second oil return pipe.

Preferably, the tail end of the first oil conveying pipe is provided with a four-way reversing valve, the four-way reversing valve comprises a first end of the four-way reversing valve, a second end of the four-way reversing valve, a third end of the four-way reversing valve and a fourth end of the four-way reversing valve, the first end of the four-way reversing valve is communicated with the tail end of the first oil conveying pipe, the third end of the four-way reversing valve is communicated with the oil inlet pipe of the jack through the third oil conveying pipe, the fourth end of the four-way reversing valve is communicated with the oil outlet pipe of the jack through a third oil return pipe, and the second end of the four-way reversing valve is communicated with the tail end of the first oil return pipe.

Preferably, a liquid level meter is arranged on the oil tank.

Preferably, the gear pump and the piston pump are provided with driving motors, and the gear pump and the piston pump are in transmission connection with the output ends of the driving motors respectively.

Preferably, first piston and second piston all adopt platelike structure, be provided with first piston sealing washer on the first piston, be provided with second piston sealing washer on the second piston, the backwash valve advances oil pipe and the backwash valve goes out oil pipe and is located the outside of second piston sealing washer, is provided with the bearing on pressure regulating plate and the threaded rod, the inner ring fixed connection of threaded rod and bearing, the outer loop and the pressure regulating plate fixed connection of bearing.

Preferably, the third oil delivery pipe and the third oil return pipe are internally and equally provided with an electronic pressure probe, and the third oil delivery pipe and the third oil return pipe are equally and equally provided with a regulating valve.

The utility model has the beneficial effects that: firstly, on the premise of ensuring that the large-volume hydraulic jack still can provide larger load capacity when working under a large load, the utility model improves the operation speed of the output end of the jack before the large-volume hydraulic jack works under the large load, fully utilizes the working time of field tensioning and improves the working efficiency.

And safety valves are respectively arranged on the first oil conveying pipe between the reflux valve driving pipe and the piston pump and on the second oil conveying pipe between the fourth oil return pipe and the gear pump, so that the first oil conveying pipe and the second oil conveying pipe are prevented from being damaged due to overhigh load.

Finally, the third oil pipeline and the third oil return pipe are respectively provided with an electronic pressure probe, and the third oil pipeline and the third oil return pipe are respectively provided with an adjusting valve. The adjusting valve on the third oil delivery pipe or the adjusting valve on the third oil return pipe is correspondingly adjusted according to the pressure fed back by the electronic pressure probe in the third oil delivery pipe or the pressure fed back by the electronic pressure probe in the third oil return pipe, so that the oil inlet amount entering the inner cavity of the jack is reduced, the final load force of the jack is more accurate, and the technical problem of fracture of a steel strand due to over tensioning is solved.

The utility model has the advantages of simple structure, convenient operation, ingenious design, great improvement on the working efficiency, good social and economic benefits and easy popularization and use.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a partially enlarged schematic view of detail a of fig. 1.

Detailed Description

As shown in fig. 1 and 2, a hydraulic driving device comprises an oil tank 1, a jack 2 is arranged on the outer side of the oil tank 1, the jack 2 adopts a hydraulic jack, the jack 2 comprises a jack oil inlet pipe and a jack oil outlet pipe, the bottom of the oil tank 1 is provided with a first oil inlet pipe 3 and a second oil inlet pipe 4, the first oil inlet pipe 3 is provided with a piston pump 5, the second oil inlet pipe 4 is provided with a gear pump 6, the end of the first oil inlet pipe 3 is communicated with the jack oil inlet pipe, the top of the jack oil outlet pipe and the top of the oil tank 1 are communicated through a first oil return pipe 7, the end of the first oil inlet pipe 3 and the end of the first oil inlet pipe 4 between the piston pump 5 are communicated, and the end of the second oil inlet pipe 4 and the second oil inlet pipe 4 between the second oil inlet pipe 4 are provided with a one-way valve 8. The oil tank 1 is provided with a liquid level meter 23. The remaining amount of hydraulic oil in the oil tank 1 is conveniently determined. In order to save cost and simplify the structure, the gear pump 6 and the piston pump 5 are provided with the driving motor 24, and the gear pump 6 and the piston pump 5 are in transmission connection with the output end of the driving motor 24 respectively.

When the jack 2 works in a large-load forward direction, only the first oil conveying pipe 3 where the piston pump 5 is located supplies oil to the jack oil inlet pipe; in order to protect the second defeated oil pipe 4 high load to be propped open, this product is in one side of second defeated oil pipe 4 be provided with the liquid accuse return valve, the liquid accuse return valve include return valve body 9, first piston 10 has set gradually along the one end of return valve body 9 in the return valve body 9 to the other end direction of return valve body 9, connecting rod 11 and second piston 12, return valve body 9 is close to one end of first piston 10 and the end of second defeated oil pipe 4 and the first defeated oil pipe 3 between the piston pump 5 and is linked together through return valve drive tube 13, return valve body 9 is close to one of second piston 12 and serves and is provided with threaded rod 14, threaded rod 14 and return valve body 9 threaded connection, be located that one of the inboard threaded rod 14 of return valve body 9 serves and is provided with pressure regulating plate 15, be provided with spring 16 between pressure regulating plate 15 and the second piston 12, be provided with return valve oil inlet pipe 17 and the return valve oil outlet on the return valve body 9 that is connected with second piston 12 The pipe 18, the second oil delivery pipe 4 between the gear pump 6 and the one-way valve 8 are communicated with the return valve oil inlet pipe 17 through a fourth oil return pipe 30, and the return valve oil outlet pipe 18 is communicated with the top of the oil tank 1 through a second oil return pipe 19. Before the operation, the pressure adjusting plate 15 is driven to move towards the second piston 12 by driving the threaded rod 14, the spring 16 is compressed to generate elastic force, and when the threaded rod 14 moves to the preset adjusting position, the driving of the threaded rod 14 is stopped to further operate. At this time, when the pressure in the first oil delivery pipe 3 is greater than the elastic force of the spring 16, at this time, the valve core composed of the first piston 10, the piston connecting rod 11 and the second piston 12 moves toward the pressure adjustment plate 15, when the cavity between the first piston 10 and the second piston 12 is located between the return valve oil inlet pipe 17 and the return valve oil outlet pipe 18, at this time, the return valve oil inlet pipe 17 and the return valve oil outlet pipe 18 are communicated through the cavity between the first piston 10 and the second piston 12, and the hydraulic oil driven by the gear pump 6 through the second oil return pipe 19 sequentially flows back to the inner cavity of the oil tank 1 through the top of the oil tank 1 via the second oil return pipe 19, the fourth oil return pipe 30, the return valve oil inlet pipe 17, the cavity between the first piston 10 and the second piston 12, the return valve oil outlet pipe 18 and the second oil return pipe 19. Simultaneously in order to further protect first defeated oil pipe 3 and second defeated oil pipe 4 to avoid the too high damage of load, this product is provided with relief valve 31 respectively on first defeated oil pipe 3 between reflux valve driving pipe 13 and piston pump 5 and on fourth oil return pipe 30 and the second defeated oil pipe 4 between gear pump 6 equally.

In order to facilitate forward driving work of the jack 2 and reverse driving work of the jack 2, the four-way reversing valve 20 is arranged at the tail end of the first oil conveying pipe 3 and comprises a first end of the four-way reversing valve, a second end of the four-way reversing valve, a third end of the four-way reversing valve and a fourth end of the four-way reversing valve, the first end of the four-way reversing valve is communicated with the tail end of the first oil conveying pipe 3, the third end of the four-way reversing valve is communicated with the oil inlet pipe of the jack through a third oil conveying pipe 21, the fourth end of the four-way reversing valve is communicated with the oil outlet pipe of the jack through a third oil return pipe 22, and the second end of the four-way reversing valve is communicated with the tail end of the first oil return pipe 7.

Third defeated oil pipe 21 and third return oil pipe 22 in equallyd divide and do not be provided with electronic pressure probe 28, at the heavy load forward drive during operation of jack 2, the hydraulic oil of oil tank 1 gets into first defeated oil pipe 3 behind piston pump 5's drive, thereby pass through third defeated oil pipe 21 in proper order with thereby jack advance oil pipe enter into the inner chamber of jack 2 output forward motion of drive jack 2, the pressure of first defeated oil pipe 3 and the pressure of return valve driving tube 13 all is approximately equal with the pressure that electronic pressure probe 28 in the third defeated oil pipe 21 fed back this moment, the pressure that electronic pressure probe 28 fed back also can indicate threaded rod 14 in this product pre-operation simultaneously preset adjusting position, the convenience is adjusted spring 16 initial compression volume. The pressure fed back by the electronic pressure probe 28 in the third oil pipeline 21 is used for judging that the positive driving work is about to approach the tail end, and the regulating valve 29 on the third oil pipeline 21 is regulated to further reduce the oil inlet amount entering the inner cavity of the jack 2, so that the final load force of the jack 2 is more accurate, and the technical problem of fracture of a steel strand caused by over-tensioning is solved.

When the heavy load reverse drive at jack 2 works, the hydraulic oil of oil tank 1 gets into first defeated oil pipe 3 and through the drive of piston pump 5 after, in proper order through the third return oil pipe 22 with the jack push out oil pipe, thereby enter into the inner chamber of jack 2 and drive jack 2's output reverse motion, the pressure of first defeated oil pipe 3 and the pressure of backward flow valve driving tube 13 all approximately equal with the pressure that the electronic pressure probe 28 in the third return oil pipe 22 fed back this moment, the pressure that the electronic pressure probe 28 fed back also can indicate threaded rod 14 when this product moves in advance simultaneously predetermine adjusting position, conveniently adjust spring 16 initial compression volume. When the reverse driving operation is about to approach the end, the final load force of the jack 2 is more accurate by adjusting the adjusting valve 29 on the third oil delivery pipe 21 to reduce the oil inlet amount entering the inner cavity of the jack 2, so that the technical problem of fracture of the steel strand due to over tensioning is solved.

First piston 10 and second piston 12 all adopt platelike structure, be provided with first piston seal 25 on the first piston 10, be provided with second piston seal 26 on the second piston 12, first piston seal 25 and second piston seal 26 all adopt the cyclic annular structure that has the rubber material to make, the return valve advances oil pipe 17 and the return valve goes out oil pipe 18 and is located the outside of second piston seal 26, be provided with bearing 27 on pressure regulating plate 15 and the threaded rod 14, the inner ring fixed connection of threaded rod 14 and bearing 27, the outer loop and the pressure regulating plate 15 fixed connection of bearing 27. The arrangement of the bearing 27 is equivalent to the addition of a limit position at the tail end of the first convenient threaded rod 14, so that the working position of the first convenient threaded rod 14 is convenient to limit, and meanwhile, the friction force received when the driving threaded rod 14 works is reduced.

The use method of the product is as follows: as shown in fig. 1 and 2, when the product works in the forward direction, the first end of the four-way reversing valve of the product is communicated with the third end of the four-way reversing valve, the second end of the four-way reversing valve is communicated with the fourth end of the four-way reversing valve, the driving motor 24 is turned on, the driving motor 24 drives the piston pump 5 and the gear pump 6 to work before the tensioned steel strand is in the tensioned state, i.e. the jack 2 is in the unloaded state, the hydraulic oil in the oil tank 1 enters the first oil delivery pipe 3 and the second oil delivery pipe 4, and correspondingly enters the third oil delivery pipe 21 through the driving of the piston pump 5 and the gear pump 6 so as to enter the inner cavity of the jack 2 through the jack oil inlet pipe to drive the forward movement of the output end of the jack 2, when the tensioned steel strand is in the large load working state, i.e. the jack 2 is in the large load working state, at the moment, the back pressure of the check valve 8 is greater than the positive pressure of the check valve 8, the check valve 8 is closed, the hydraulic oil in the first oil pipeline 3 enters the inner cavity of the return valve body 9 at the side far away from the second piston 12 with the first piston 10 through the return valve driving pipe 13, the spring 16 is gradually compressed, when the cavity between the first piston 10 and the second piston 12 is positioned between the return valve oil inlet pipe 17 and the return valve oil outlet pipe 18, the hydraulic oil in the second oil pipeline 4 driven by the gear pump 6 returns to the inner cavity of the oil tank 1 through the second oil return pipe 19, the jack oil inlet pipe is independently provided by the hydraulic oil in the first oil pipeline 3 driven by the piston pump 5, whether the tensioning work is close to a forward preset tensioning value is judged according to an electronic pressure probe 28 arranged in the third oil pipeline 21, and the difference between the electronic pressure probe 28 arranged in the third oil pipeline 21 and the forward preset tensioning value is smaller and smaller, a regulating valve 29 is arranged on the corresponding regulating third flow line 21. When the forward preset tension value is reached, the third oil delivery pipe 21 is closed and the regulating valve 29 is arranged. And simultaneously the driving motor 24 is turned off, and the forward tensioning is finished.

When reverse tensioning is needed, the four-way reversing valve 20 is adjusted, when a first end of the four-way reversing valve is communicated with a fourth end of the four-way reversing valve, and a second end of the four-way reversing valve is communicated with a third end of the four-way reversing valve, the preparation for reverse tensioning is completed, and different from the forward tensioning, before a tensioned steel strand is in a tensioning state, namely the jack 2 is in an idle load state, hydraulic oil in the oil tank 1 enters the first oil conveying pipe 3 and the second oil conveying pipe 4, and correspondingly enters the third oil return pipe 22 through the driving of the piston pump 5 and the gear pump 6 so as to enter an inner cavity of the jack 2 so as to drive the reverse movement of the output end of the jack 2; when the tensioned steel strand is in a tensioning state, that is, the jack 2 is in a heavy-load working state, at this time, corresponding hydraulic oil which is driven by the piston pump 5 in the first oil pipeline 3 and then is separately provided for the jack 2 enters the inner cavity of the jack 2 through the third oil return pipe 22, whether tensioning work is close to a reverse preset tensioning value is further judged according to an electronic pressure probe 28 arranged in the third oil return pipe 22, and as a difference value between the electronic pressure probe 28 arranged in the third oil return pipe 22 and the reverse preset tensioning value is smaller and smaller, an adjusting valve 29 is correspondingly adjusted to be arranged on the third oil return pipe 22. When the reverse preset tension value is reached, the third oil return pipe 22 is closed and the regulating valve 29 is arranged. And simultaneously the drive motor 24 is turned off and the reverse tensioning is finished.

Through the embodiment, the large load capacity of the piston pump 5 is fully utilized, but the driving hydraulic oil amount in unit time is small, and the gear pump 6 is combined, although the load capacity is small, but the driving hydraulic oil amount in unit time is large, so that on the premise that the large-volume hydraulic jack still can provide large load capacity when working under the large load, the operation speed of the output end of the jack before the large-volume hydraulic jack works under the large load is improved, the field tensioning working time is fully utilized, and the working efficiency is improved. It should be noted that, in actual practice, the electronic pressure probe 28 and the regulating valve 29 are usually of an integral structure, and the electronic pressure probe 28 is installed at the inlet end of the regulating valve 29 or at the outlet end of the regulating valve 29.

The utility model is a hydraulic driving device which meets the needs of workers in the field of hydraulic driving, so that the utility model has wide market prospect.

Claims

1. A hydraulic drive apparatus characterized by: comprises an oil tank (1), a jack (2) is arranged on the outer side of the oil tank (1), the jack (2) comprises a jack oil inlet pipe and a jack oil outlet pipe, a first oil delivery pipe (3) and a second oil delivery pipe (4) are arranged at the bottom of the oil tank (1), a piston pump (5) is arranged on the first oil delivery pipe (3), a gear pump (6) is arranged on the second oil delivery pipe (4), the tail end of the first oil delivery pipe (3) is communicated with the oil inlet pipe of the jack, the jack is pushed out the top of oil pipe and oil tank (1) and is linked together through first time oil pipe (7), first defeated oil pipe (3) between the end of first defeated oil pipe (3) and piston pump (5) are linked together with the end of second defeated oil pipe (4), be provided with check valve (8) on the defeated oil pipe (4) of second between the end of second defeated oil pipe (4) and gear pump (6).

2. The hydraulic drive of claim 1, wherein: one side of second defeated oil pipe (4) be provided with the liquid accuse return valve, the liquid accuse return valve include return valve body (9), first piston (10), piston connecting rod (11) and second piston (12) have set gradually to the other end direction of return valve body (9) along the one end of return valve body (9) in return valve body (9), return valve body (9) are close to one end of first piston (10) and the first defeated oil pipe (3) between the end of second defeated oil pipe (4) and piston pump (5) and are linked together through return valve driving tube (13), return valve body (9) are close to one of second piston (12) and are served and are provided with threaded rod (14), be located one of return valve body (9) inboard threaded rod (14) and serve and be provided with pressure regulating plate (15), be provided with spring (16) between pressure regulating plate (15) and second piston (12), a backflow valve oil inlet pipe (17) and a backflow valve oil outlet pipe (18) are arranged on a backflow valve body (9) connected with the second piston (12), a second oil delivery pipe (4) between the gear pump (6) and the one-way valve (8) is communicated with the backflow valve oil inlet pipe (17) through a fourth oil return pipe (30), and the backflow valve oil outlet pipe (18) is communicated with the top of the oil tank (1) through a second oil return pipe (19).

3. The hydraulic drive of claim 1, wherein: the end of first defeated oil pipe (3) on be provided with four-way reversing valve (20), four-way reversing valve (20) include four-way reversing valve first end, four-way reversing valve second end, four-way reversing valve third end and four-way reversing valve fourth end, the end of four-way reversing valve first end and first defeated oil pipe (3) be linked together, four-way reversing valve third end with jack advance between the oil pipe through third defeated oil pipe (21) be linked together, four-way reversing valve fourth end with jack push out between the oil pipe through third return oil pipe (22) be linked together, four-way reversing valve second end and the end of first return oil pipe (7) be linked together.

4. The hydraulic drive of claim 1, wherein: the oil tank (1) is provided with a liquid level meter (23).

5. The hydraulic drive of claim 2, wherein: gear pump (6) and piston pump (5) on be provided with driving motor (24), gear pump (6) and piston pump (5) are equallyd divide and are connected with the output transmission of driving motor (24) respectively.

6. The hydraulic drive of claim 2, wherein: first piston (10) and second piston (12) all adopt platelike structure, be provided with first piston sealing washer (25) on first piston (10), be provided with second piston sealing washer (26) on second piston (12), return valve advances oil pipe (17) and return valve goes out oil pipe (18) and is located the outside of second piston sealing washer (26), be provided with bearing (27) on pressure regulating plate (15) and threaded rod (14), the inner ring fixed connection of threaded rod (14) and bearing (27), the outer loop and pressure regulating plate (15) fixed connection of bearing (27).

7. The hydraulic drive of claim 3, wherein: and the third oil conveying pipe (21) and the third oil return pipe (22) are internally provided with an electronic pressure probe (28) respectively, and the third oil conveying pipe (21) and the third oil return pipe (22) are respectively provided with a regulating valve (29).