Hydraulic driving device

Abstract

The utility model relates to a hydraulic driving device which comprises an oil storage tank, a first oil return pipe is arranged on the oil storage tank, an inner pipe is arranged at the bottom of the oil storage tank, an outer pipe is sleeved on the outer side of the inner pipe, the bottom end of the outer pipe is connected with the bottom of the oil storage tank, an annular installation cavity is arranged between the outer pipe and the inner pipe, and a filter element is arranged in the installation cavity. Sealing covers are arranged on the top of the outer pipe and the top of the inner pipe, a first through hole set is formed in the outer pipe, a second through hole set is formed in the portion, below the first through hole set, of the inner pipe, the first through hole set and the second through hole set each comprise a plurality of oil conveying holes which are evenly distributed around the central axis of the inner pipe in a star shape, and an oil conveying header pipe is arranged at the bottom end of the inner pipe. And a booster pump is arranged on the oil transportation main pipe. The filter efficiency provided by the whole filter element can be fully utilized, and the increase of the whole flow resistance of the filter element caused by the increase of the local flow resistance of the filter element is reduced. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic drive equipment, in particular to a hydraulic drive device. Background Art

[0002] The application of prestressing technology in concrete structures is to enhance the overall stress of concrete. By changing the stress mode before the structure is subjected to stress, the stability and bearing capacity of the structure can be effectively improved. In addition, the use of prestressing can effectively offset the external loads on the bridge and can effectively avoid cracks during the construction process. It is worth noting that the reinforcement method for prestressed concrete construction should be intelligent reinforcement. The steel bars are pre-fixed in the components and connected tightly, which can improve the integrity of the internal structure and enhance its rigidity. During the use of concrete load-bearing components, the use of prestressing technology can share the tensile force of concrete and prestressed steel bars, thereby giving full play to the tensile strength and other mechanical properties of concrete and prestressed steel bars in the structure, improving the bearing capacity of the structure, improving the stress state, and reducing the occurrence of undesirable conditions such as cracks.

[0003] In the reverse tensioning and prestressing construction technology, continuous jacks are often used to tension the fine-rolled threaded rods to eliminate the inelastic deformation of the bracket and ensure the overall stability and linear quality of the bridge. The continuous jack has good synchronization, always maintaining a balanced and seamless alternating force between the front and rear jacks, effectively controlling the entire process of jacking or rotation to be smooth and without impact and vibration. The continuous jack uses the hydraulic oil provided by the supporting hydraulic pump station system to perform the action. As the number of pumping and oil return times increases, the hydraulic oil of the hydraulic pump station will inevitably carry more and more mechanical impurities. In the existing technology, it is usually achieved by adding a filter in front of the booster pump to filter the mechanical impurities in the hydraulic oil, thereby preventing mechanical impurities from damaging the booster pump or the piston in the jack. However, the existing filter element for hydraulic oil filtration generally adopts a linear filtration method. The linear filtration method of the filter element is that the hydraulic oil passes through the entire filter element in a straight line from one end of the filter element to the other end of the filter element. This filtration method is more effective in filtering mechanical impurities, but it also has disadvantages. When the flow resistance provided by the filter element as a whole carrying mechanical impurities is greater than the preset value, the filter element must be replaced, otherwise the overall flow resistance of the system will increase, making it difficult to supply hydraulic oil. Excessive mechanical impurities in the filter element will also cause the flow resistance provided by the filter element as a whole to be too high. Therefore, the filter element using the linear filtration method does not fully utilize the filtering efficiency provided by the filter element as a whole. Frequent replacement of the filter element will also increase the operating costs of the enterprise. Therefore, there is room for improvement in fully utilizing the filtering efficiency provided by the filter element as a whole. Reducing the frequency of filter element replacement can not only reduce the operating costs of the enterprise, but also reduce the time cost of replacing the filter element. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the present invention provides a hydraulic drive device that can fully utilize the filtering efficiency provided by the entire filter element to reduce the increase in the overall flow resistance of the filter element caused by the increase in local flow resistance of the filter element, so as to overcome the defects in the existing technology.

[0005] The technical solution adopted by the utility model is as follows: a hydraulic drive device comprises an oil storage tank, a first oil return pipe is provided on the oil storage tank, an inner tube is provided on the bottom of the oil storage tank, an outer tube is sleeved on the outer side of the inner tube, the bottom end of the outer tube is connected to the bottom of the oil storage tank, a central axis of the inner tube and the central axis of the outer tube are located on the same axis, an annular installation cavity is provided between the outer tube and the inner tube, a filter element is provided in the installation cavity, a sealing cover is provided on the top of the outer tube and the top of the inner tube, a first through-hole group is provided on the outer tube, a second through-hole group is provided on the inner tube below the first through-hole group, the number of the first through-hole group and the second through-hole group are both adopted, and the first through-hole group and the second through-hole group are alternately distributed below the sealing cover, each of the first through-hole group and the second through-hole group includes a plurality of oil delivery holes uniformly distributed in a star shape around the central axis of the inner tube, an oil delivery main pipe is provided on the bottom end of the inner tube, and a booster pump is provided on the oil delivery main pipe.

[0006] Preferably, the oil main pipe is provided with an inlet end of a first oil pipe and an inlet end of a first pressure relief pipe in sequence along the direction from close to the inner pipe to away from the inner pipe, and a pressure relief valve is provided on the outlet end of the first oil pipe and the outlet end of the first pressure relief pipe. The pressure relief valve includes a valve body, a first oil inlet provided on one end of the valve body, a second oil inlet and an oil outlet symmetrically provided on the valve body above the first oil inlet, and a first piston, a piston connecting rod, a second piston, a spring, a spring pressure plate and an adjusting screw are provided in the valve body cavity in sequence along the direction from close to the first oil inlet to away from the first oil inlet, the adjusting screw and the spring pressure plate are abutted against each other, and the adjusting screw and the valve body are threadedly connected; the outlet end of the first oil pipe is connected to the inlet end of the first oil inlet, the outlet end of the first pressure relief pipe is connected to the inlet end of the second oil inlet, and the oil outlet is connected to the first return oil pipe.

[0007] Preferably, a first one-way valve is provided on the first pressure relief pipe, and a first pressure sensor is provided on the oil main pipe between the outlet end of the oil main pipe and the inlet end of the first pressure relief pipe.

[0008] Preferably, a continuous jack is also included, and the continuous jack includes a first jack and a second jack distributed in a straight line, the oil inlet of the first jack is connected to the first end of the first four-way reversing valve, the second end of the first four-way reversing valve is connected to the return oil end of the first jack, the oil inlet of the second jack is connected to the first end of the second four-way reversing valve, the second end of the second four-way reversing valve is connected to the return oil end of the second jack, the third end of the first four-way reversing valve and the third end of the second four-way reversing valve are respectively connected to the outlet end of the oil main pipe, the fourth end of the first four-way reversing valve and the fourth end of the second four-way reversing valve are provided with a second return oil pipe, and the second return oil pipe is connected to the first return oil pipe.

[0009] Preferably, a first oil supply pipe is provided between the oil inlet of the first jack and the first end of the first four-way reversing valve, a second oil supply pipe is provided between the second end of the first four-way reversing valve and the oil return end of the first jack, a third oil supply pipe is provided between the oil inlet of the second jack and the first end of the second four-way reversing valve, a fourth oil supply pipe is provided between the second end of the second four-way reversing valve and the oil return end of the second jack, a second one-way valve is provided on the first oil supply pipe, and a third one-way valve is provided on the third oil supply pipe. The second one-way valve and the third one-way valve both adopt pilot one-way valves, the pilot end of the second one-way valve is connected to the second oil supply pipe, and the pilot end of the third one-way valve is connected to the fourth oil supply pipe.

[0010] Preferably, a liquid level sensor is provided on the oil storage tank.

[0011] Preferably, a second pressure sensor is provided in the oil storage tank outside the outer tube, a third pressure sensor is provided on the oil main pipe between the booster pump and the inner tube, and sealing rings are respectively provided between the outer tube and the cover and between the cover and the inner tube.

[0012] The beneficial effects of the utility model are as follows: first, the utility model first uses the plurality of first through-hole groups provided on the outer tube to screen mechanical impurities, so that the mechanical impurities are not easily contacted with the filter element; the hydraulic oil passes through the filter channel composed of the first through-hole group, the filter element between the first through-hole group and the adjacent second through-hole group, and the second through-hole group to filter the mechanical impurities carried in the hydraulic oil. Since the filter channels are distributed in multiple groups, compared with the linear filtering method through the filter element, this product can make full use of the filtering efficiency provided by the filter element as a whole to filter the mechanical impurities.

[0013] Secondly, the oil storage tank of the present invention is provided with a liquid level sensor; installation of the liquid level sensor facilitates feedback of the liquid level height.

[0014] Again, sealing rings are respectively provided between the outer tube and the cover, and between the cover and the inner tube. Installing the sealing rings facilitates narrowing the gap between the outer tube and the cover, or narrowing the gap between the inner tube and the cover.

[0015] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved work efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model.

[0017] Figure 2 for Figure 1 A partially enlarged schematic diagram of detail A.

[0018] Figure 3 for Figure 1 A partially enlarged schematic diagram of detail B. DETAILED DESCRIPTION

[0019] like Figures 1 to 3 As shown, a hydraulic drive device includes an oil storage tank 1, a first oil return pipe 2 is provided on the oil storage tank 1, an inner tube 3 is provided on the bottom of the oil storage tank 1, an outer tube 4 is sleeved on the outside of the inner tube 3, the bottom end of the outer tube 4 is connected to the bottom of the oil storage tank 1, the central axis of the inner tube 3 and the central axis of the outer tube 4 are located on the same axis, an annular installation cavity is provided between the outer tube 4 and the inner tube 3, a filter element 38 is provided in the installation cavity, a cover 5 is provided on the top of the outer tube 4 and the top of the inner tube 3, a first through hole group is provided on the outer tube 4, a second through hole group is provided on the inner tube 3 below the first through hole group, the number of the first through hole group and the second through hole group are both several, and the several first through hole groups and the several second through hole groups are alternately distributed below the cover 5. Each of the first through hole groups and each of the second through hole groups includes a plurality of oil delivery holes 6 evenly distributed in a star shape around the central axis of the inner tube 3. The number of oil delivery holes 6 in each of the first through hole groups is not less than the number of oil delivery holes 6 in the adjacent second through hole groups. An oil delivery main pipe 7 is provided at the bottom end of the inner tube 3, and a booster pump 8 is provided on the oil delivery main pipe 7.

[0020] The oil main pipe 7 is provided with an inlet end of a first oil pipe 9 and an inlet end of a first pressure relief pipe 10 in sequence from close to the inner pipe 3 to away from the inner pipe 3 , and the booster pump 8 is located between the first oil pipe 9 and the inner pipe 3 . A pressure relief valve is provided on the outlet end of the first oil pipeline 9 and the outlet end of the first pressure relief pipe 10. The pressure relief valve includes a valve body 11, a first oil inlet 12 provided on one end of the valve body 11, a second oil inlet 13 and an oil outlet 14 symmetrically provided on the valve body 11 above the first oil inlet 12, and a first piston 15, a piston connecting rod 16, a second piston 17, a spring 18, a spring pressure plate 19 and an adjusting screw 20 are sequentially provided in the inner cavity of the valve body 11 along the direction from close to the first oil inlet 12 to away from the first oil inlet 12. The adjusting screw 20 and the spring pressure plate 19 are abutted against each other, and the adjusting screw 20 is threadedly connected to the valve body 11; the outlet end of the first oil pipeline 9 is connected to the inlet end of the first oil inlet 12, the outlet end of the first pressure relief pipe 10 is connected to the inlet end of the second oil inlet 13, and the oil outlet 14 is connected to the first oil return pipe 2.

[0021] When the oil main pipe 7 is operating within the preset pressure value, at this time, the end of the second oil inlet 13 facing the valve body 11 and the end of the oil outlet 14 facing the valve body 11 are both blocked by the second piston 17; when the hydraulic oil transported in the oil main pipe 7 exceeds the preset limit, part of the hydraulic oil enters the valve body 11 between the first piston 15 and the first oil inlet 12 in sequence through the first oil pipe 9 and the first oil inlet 12, thereby causing the first piston 15, the piston connecting rod 16 and the second piston 17 to move toward the spring pressure plate 19. During this process, the spring 18 is gradually compressed until the piston connecting rod 16 is located between the second oil inlet 13 and the oil outlet 14, and the second oil inlet 13 and the oil outlet 14 are connected. The overpressure part of the hydraulic oil passes through the first pressure relief pipe 10, the second oil inlet 13, the inner cavity of the valve body 11 between the first piston 15 and the second piston 17 and the oil outlet 14 in sequence, and is then transported back to the first return pipe 2 through the oil outlet 14 and thus flows back into the oil storage tank 1. As the pressure of the hydraulic oil transported within the oil main pipe 7 gradually decreases, the spring 18 gradually resets, and the first piston 15, piston connecting rod 16, and second piston 17 gradually move toward the first oil inlet 12, while the second oil inlet 13 and oil outlet 14 are again gradually blocked by the second piston 17. Furthermore, a first one-way valve 21 is provided on the first pressure relief pipe 10, and a first pressure sensor 22 is provided on the oil main pipe 7 between the outlet end of the oil main pipe 7 and the inlet end of the first pressure relief pipe 10. The installation of the first pressure sensor 22 facilitates feedback of the pressure within the oil main pipe 7, thereby facilitating further adjustment of the relative position of the spring pressure plate 19 via the adjusting screw 20, thereby adjusting the initial compression of the spring 18.

[0022] In addition, this product also includes a continuous jack, which includes a first jack 23 and a second jack 24 distributed in a straight line. The oil inlet of the first jack 23 is connected to the first end of the first four-way reversing valve 25, and the second end of the first four-way reversing valve 25 is connected to the oil return end of the first jack 23. The oil inlet of the second jack 24 is connected to the first end of the second four-way reversing valve 26, and the second end of the second four-way reversing valve 26 is connected to the oil return end of the second jack 24. The third end of the first four-way reversing valve 25 and the third end of the second four-way reversing valve 26 are respectively connected to the outlet end of the oil main pipe 7. The fourth end of the first four-way reversing valve 25 and the fourth end of the second four-way reversing valve 26 are provided with a second oil return pipe 27, and the second oil return pipe 27 is connected to the first oil return pipe 2. A first oil supply pipe 28 is provided between the oil inlet of the first jack 23 and the first end of the first four-way reversing valve 25, a second oil supply pipe 29 is provided between the second end of the first four-way reversing valve 25 and the oil return end of the first jack 23, a third oil supply pipe 30 is provided between the oil inlet of the second jack 24 and the first end of the second four-way reversing valve 26, a fourth oil supply pipe 31 is provided between the second end of the second four-way reversing valve 26 and the oil return end of the second jack 24, a second one-way valve 32 is provided on the first oil supply pipe 28, and a third one-way valve 33 is provided on the third oil supply pipe 30. The second one-way valve 32 and the third one-way valve 33 both adopt pilot one-way valves, the pilot end of the second one-way valve 32 is connected to the second oil supply pipe 29, and the pilot end of the third one-way valve 33 is connected to the fourth oil supply pipe 31.

[0023] The oil storage tank 1 is provided with a liquid level sensor 34; the installation of the liquid level sensor 34 facilitates feedback of the liquid level height.

[0024] A second pressure sensor 35 is installed in the oil storage tank 1 outside the outer tube 4, and a third pressure sensor 36 is installed on the oil delivery manifold 7 between the boost pump 8 and the inner tube 3. This facilitates the use of the pressure parameters fed back by the third pressure sensor 36 and the pressure parameters fed back by the second pressure sensor 35 to comprehensively determine the flow resistance parameters provided by the filter element 38. Seal rings 37 are respectively installed between the outer tube 4 and the cover 5, and between the cover 5 and the inner tube 3. Installing the seal rings 37 facilitates narrowing the gap between the outer tube 4 and the cover 5, or narrowing the gap between the inner tube 3 and the cover 5.

[0025] The method of using this product is as follows: Figures 1 to 3 As shown, the following steps are included:

[0026] S1. First, hydraulic oil is added to the oil storage tank 1 until the liquid level parameter fed back by the liquid level sensor 34 on the oil storage tank 1 reaches a preset range; the booster pump 8 is turned on, and the hydraulic oil in the oil storage tank 1 passes through the first through-hole group, the filter element 38 between the first through-hole group and the adjacent second through-hole group, and the second through-hole group in sequence, enters the inner cavity of the inner tube 3, and is then transported through the inner tube 3 to the oil main pipe 7, driven by the booster pump 8, and flows toward the outlet end of the oil main pipe 7.

[0027] S2. The hydraulic oil transported from the outlet end of the oil main pipe 7 is divided into two parts, namely the first part of hydraulic oil and the second part of hydraulic oil. The first part of hydraulic oil is sequentially transported to the oil inlet of the second jack 24 through the third end of the second four-way reversing valve 26, the first end of the second four-way reversing valve 26 and the third oil supply pipe 30, while the hydraulic oil discharged from the second jack 24 is sequentially transported to the second oil return pipe 27 through the return oil end of the second jack 24, the fourth oil supply pipe 31, the second end of the second four-way reversing valve 26 and the fourth end of the second four-way reversing valve 26, and then returned to the oil storage tank 1 through the first oil return pipe 2. In the process of the first part of hydraulic oil supplying hydraulic oil to the second jack 24, the second jack 24 completes the ejection process; the second part of hydraulic oil is sequentially transported to the oil supply pipe 31, the second end of the second four-way reversing valve 26 and the fourth end of the second four-way reversing valve The hydraulic oil is delivered to the return oil end of the first jack 23 through the third end of the first four-way reversing valve 25, the second end of the first four-way reversing valve 25, and the second oil supply pipe 29; in this process, the second oil supply pipe 29 receives the hydraulic oil delivered by the oil main pipe 7, and part of the hydraulic oil is delivered to the pilot end of the second one-way valve 32, thereby causing the valve disc of the second one-way valve 32 and the valve seat of the second one-way valve 32 to separate; thereby the hydraulic oil discharged from the first jack 23 is returned to the oil storage tank 1 through the oil inlet of the first jack 23, the first oil supply pipe 28, the first end of the first four-way reversing valve 25, the fourth end of the first four-way reversing valve 25, the second oil return pipe 27 and the first oil return pipe 2 in sequence. In the process of the second part of the hydraulic oil being delivered to the first jack 23, the first jack 23 completes the return process.

[0028] S3, switch the use state of the first four-way reversing valve 25 and switch the use state of the second four-way reversing valve 26. At this time, the hydraulic oil transported from the outlet end of the oil main pipe 7 is divided into two parts again, namely the third part of hydraulic oil and the fourth part of hydraulic oil. The third part of hydraulic oil is sequentially transported to the return oil end of the second jack 24 through the third end of the second four-way reversing valve 26, the second end of the second four-way reversing valve 26 and the fourth oil supply pipe 31. The fourth oil supply pipe 31 receives the hydraulic oil transported by the oil main pipe 7, and part of the hydraulic oil is transported to the pilot end of the third one-way valve 33, thereby causing the valve disc of the third one-way valve 33 and the valve seat of the third one-way valve 33 to separate; the hydraulic oil discharged from the second jack 24 is transported through the oil inlet of the second jack 24, the third oil supply pipe 30, the first end of the second four-way reversing valve 26, the second four-way reversing valve The fourth end of the valve 26, the second oil return pipe 27 and the first oil return pipe 2 are returned to the oil storage tank 1. In the process of the third part of the hydraulic oil supplying hydraulic oil to the second jack 24, the second jack 24 completes the return process; the fourth part of the hydraulic oil is sequentially delivered to the first jack 23 through the third end of the first four-way reversing valve 25, the first end of the first four-way reversing valve 25, the first oil supply pipe 28 and the oil inlet of the first jack 23; the hydraulic oil discharged to the outside of the first jack 23 is sequentially returned to the oil storage tank 1 through the return oil end of the first jack 23, the second oil supply pipe 29, the second end of the first four-way reversing valve 25, the fourth end of the first four-way reversing valve 25, the second oil return pipe 27 and the first oil return pipe 2; in the process of the fourth hydraulic oil supplying hydraulic oil to the first jack 23, the first jack 23 completes the ejection process.

[0029] S4. Repeat steps S2 to S3 until the tensioning process is completed.

[0030] According to this embodiment, when the hydraulic oil is sent back to the oil storage tank 1 from the first jack 23, the second jack 24 or the pressure relief valve, it will inevitably carry mechanical impurities. However, this product first uses the multiple first through-hole groups provided on the outer tube 4 to screen the mechanical impurities, so that the mechanical impurities are not easily contacted by the filter element 38; the hydraulic oil is filtered through the filter channel composed of the first through-hole group, the filter element 38 between the first through-hole group and the adjacent second through-hole group, and the second through-hole group. Since the filter channels are distributed in multiple groups, compared with the linear filtering method through the filter element, this product can more fully utilize the filtering efficiency provided by the entire filter element to filter mechanical impurities; and some filter channels will cause the flow resistance of these filter channels to increase due to excessive mechanical impurities. The hydraulic oil can filter the mechanical impurities through other filter channels with relatively low flow resistance, thereby reducing the technical problem of frequent replacement of the filter element due to the increase in the overall flow resistance of the filter element caused by the increase in local flow resistance of the filter element, thereby reducing the frequency of filter element replacement.

[0031] The embodiments described above are only preferred embodiments of the present invention and do not limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structure, features and principles described in the patent scope of the present invention should be included in the scope of the patent application of the present invention.

Claims

1. A hydraulic drive device, characterized in that: The invention comprises an oil storage tank (1), wherein a first oil return pipe (2) is provided on the oil storage tank (1), an inner pipe (3) is provided on the bottom of the oil storage tank (1), an outer pipe (4) is sleeved on the outer side of the inner pipe (3), the bottom end of the outer pipe (4) is connected to the bottom of the oil storage tank (1), the central axis of the inner pipe (3) and the central axis of the outer pipe (4) are located on the same axis, an annular installation cavity is provided between the outer pipe (4) and the inner pipe (3), a filter element (38) is provided in the installation cavity, a sealing cover (5) is provided on the top of the outer pipe (4) and the top of the inner pipe (3), and a filter element (38) is provided on the outer pipe (4). A first through hole group, a second through hole group is provided on the inner tube (3) below the first through hole group, the number of the first through hole group and the number of the second through hole group are both several, the several first through hole groups and the several second through hole groups are alternately distributed below the cover (5), each of the first through hole group and each of the second through hole groups includes a plurality of oil delivery holes (6) uniformly distributed in a star shape around the central axis of the inner tube (3), an oil delivery main pipe (7) is provided on the bottom end of the inner tube (3), and a booster pump (8) is provided on the oil delivery main pipe (7).

2. The hydraulic drive device according to claim 1, characterized in that: The oil main pipe (7) is provided with an inlet end of a first oil pipe (9) and an inlet end of a first pressure relief pipe (10) in sequence along a direction from close to the inner pipe (3) to away from the inner pipe (3), and a pressure relief valve is provided on the outlet end of the first oil pipe (9) and the outlet end of the first pressure relief pipe (10), and the pressure relief valve includes a valve body (11), a first oil inlet (12) provided on one end of the valve body (11), a second oil inlet (13) and an oil outlet (14) symmetrically provided on the valve body (11) above the first oil inlet (12), and an inner cavity of the valve body (11) along a direction close to the first oil inlet (12). 2) A first piston (15), a piston connecting rod (16), a second piston (17), a spring (18), a spring pressure plate (19) and an adjusting screw (20) are sequentially arranged in a direction away from the first oil inlet (12), the adjusting screw (20) and the spring pressure plate (19) are abutted against each other, and the adjusting screw (20) and the valve body (11) are threadedly connected; the outlet end of the first oil delivery pipe (9) is connected to the inlet end of the first oil inlet (12), the outlet end of the first pressure relief pipe (10) is connected to the inlet end of the second oil inlet (13), and the oil outlet (14) is connected to the first oil return pipe (2).

3. The hydraulic drive device according to claim 2, characterized in that: A first one-way valve (21) is provided on the first pressure relief pipe (10), and a first pressure sensor (22) is provided on the oil main pipe (7) between the outlet end of the oil main pipe (7) and the inlet end of the first pressure relief pipe (10).

4. The hydraulic drive device according to claim 1, characterized in that: The invention also includes a continuous jack, wherein the continuous jack includes a first jack (23) and a second jack (24) distributed in a straight line, the oil inlet of the first jack (23) is connected to the first end of the first four-way reversing valve (25), the second end of the first four-way reversing valve (25) is connected to the oil return end of the first jack (23), the oil inlet of the second jack (24) is connected to the first end of the second four-way reversing valve (26), the second end of the second four-way reversing valve (26) is connected to the oil return end of the second jack (24), the third end of the first four-way reversing valve (25) and the third end of the second four-way reversing valve (26) are respectively connected to the outlet end of the oil main pipe (7), the fourth end of the first four-way reversing valve (25) and the fourth end of the second four-way reversing valve (26) are provided with a second oil return pipe (27), and the second oil return pipe (27) is connected to the first oil return pipe (2).

5. The hydraulic drive device according to claim 4, characterized in that: A first oil supply pipe (28) is provided between the oil inlet of the first jack (23) and the first end of the first four-way reversing valve (25), a second oil supply pipe (29) is provided between the second end of the first four-way reversing valve (25) and the oil return end of the first jack (23), a third oil supply pipe (30) is provided between the oil inlet of the second jack (24) and the first end of the second four-way reversing valve (26), and a third oil supply pipe (31) is provided between the second end of the second four-way reversing valve (26) and the oil return end of the second jack (23). A fourth oil supply pipe (31) is provided between the oil return ends of the jack (24), a second one-way valve (32) is provided on the first oil supply pipe (28), and a third one-way valve (33) is provided on the third oil supply pipe (30). The second one-way valve (32) and the third one-way valve (33) are both pilot-operated one-way valves. The pilot end of the second one-way valve (32) is connected to the second oil supply pipe (29), and the pilot end of the third one-way valve (33) is connected to the fourth oil supply pipe (31).

6. The hydraulic drive device according to claim 1, characterized in that: The oil storage tank (1) is provided with a liquid level sensor (34).

7. The hydraulic drive device according to claim 1, characterized in that: A second pressure sensor (35) is provided in the oil storage tank (1) outside the outer tube (4), a third pressure sensor (36) is provided on the oil delivery main pipe (7) between the booster pump (8) and the inner tube (3), and sealing rings (37) are provided between the outer tube (4) and the cover (5) and between the cover (5) and the inner tube (3).

Images