Pile clamping force adaptive control device and static pile driver

Abstract

A pile clamping force adaptive control device and a static pile press. The pile clamping force adaptive control device includes a pile clamping oil cylinder, a first pile pressing oil cylinder, a second pile pressing oil cylinder, first, second, and third oil ports, fifth and sixth oil paths. The first oil port is connected to the first chamber of the pile clamping oil cylinder through the first oil path, the second oil port is connected to the third chamber of the first pile pressing oil cylinder through the second oil path, and the third oil port is connected to the fifth chamber of the second pile pressing oil cylinder through the third oil path. A first pressure reducing valve and a second pressure reducing valve are respectively provided on the fifth and sixth oil paths, and the set pressures of the first pressure reducing valve and the second pressure reducing valve increase in sequence. In the pile clamping force adaptive control device and the static pile press of the present invention, by setting pressure reducing valves with different pressure reducing values, the pile clamping force can be automatically increased as the number of pile pressing oil cylinders participating in pile pressing increases, so that the pile clamping force adapts to the pile pressing force, which not only saves the auxiliary working time, but also avoids the phenomena of slipping due to too small pile clamping force and breaking the pile due to too large pile clamping force.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and particularly to a clamping force adaptive control device and a static pile driver. Background Art

[0002] The static pile driver has the advantages of noiselessness, pollution-free (motor-driven), and high operation efficiency, and is particularly suitable for urban building foundation construction. The operation of the static pile driver is to use the hydraulic cylinder of the pile clamp to clamp the pile body, and then use the pile pressing cylinder to push the pile clamp to press the pile body into the ground. An important requirement for a hydraulic static pile driver is to firmly clamp the pile body, but at the same time, the clamping force should not be too large to crack the pile body, which is a key factor affecting the normal operation of the hydraulic static pile driver.

[0003] Currently, the clamping force of the clamping cylinder of the static pile driver is preset, and the size of the clamping force has no direct relationship with the size of the pile pressing force; during operation, as the pile pressing resistance increases, it is often possible to slip between the clamping cylinder and the pile body. To prevent slipping, the clamping force of the clamping control hydraulic system often needs to be set very large at the beginning, which is likely to break the pile body during the pile pressing process. Summary of the Invention

[0004] The purpose of the present invention is to provide a clamping force adaptive control device and a static pile driver that can prevent clamping slippage and ensure that the clamping force is not too large.

[0005] The present invention provides a clamping force adaptive control device, which includes a clamping cylinder, a first pile pressing cylinder, a second pile pressing cylinder, a first oil port, a second oil port, and a third oil port. The clamping cylinder includes a first chamber and a second chamber. The first pile pressing cylinder includes a third chamber and a fourth chamber. The second pile pressing cylinder includes a fifth chamber and a sixth chamber. The first oil port is connected to the first chamber through a first oil path. The second oil port is connected to the third chamber through a second oil path. The third oil port is connected to the fifth chamber through a third oil path.

[0006] The clamping force adaptive control device further includes a fifth oil path connected between the first oil path and the second oil path and a sixth oil path connected between the first oil path and the third oil path. A first pressure reducing valve and a second pressure reducing valve are respectively provided on the fifth oil path and the sixth oil path, and the set pressures of the first pressure reducing valve and the second pressure reducing valve increase in sequence.

[0007] In one embodiment, the pile clamping force adaptive control device further includes a fifth oil port, a sixth oil port, and a seventh oil port. The fifth oil port is connected to the second chamber of the pile clamping cylinder through an eighth oil circuit. The sixth oil port is connected to the fourth chamber of the first pile pressing cylinder through a ninth oil circuit. The seventh oil port is connected to the sixth chamber of the second pile pressing cylinder through a tenth oil circuit. The pile clamping force adaptive control device further includes a twelfth oil circuit, which is connected between the third oil circuit and the tenth oil circuit. A first hydraulic lock is provided on the twelfth oil circuit, and the control oil port of the first hydraulic lock is connected to the ninth oil circuit.

[0008] In one embodiment, the pile clamping force adaptive control device further includes a first control valve, which is provided between the first hydraulic lock and the ninth oil circuit.

[0009] In one embodiment, the first control valve includes a first position and a second position. In the first position, the first control valve connects the first hydraulic lock to the oil tank, and the first hydraulic lock is closed. In the second position, the first control valve connects the first hydraulic lock to the ninth oil circuit, and the first hydraulic lock is opened.

[0010] In one embodiment, a first one-way valve is further provided on the twelfth oil circuit, and the twelfth oil circuit is also connected to the oil tank.

[0011] In one embodiment, the pile clamping force adaptive control device further includes a third hydraulic lock, which is connected between the third chamber of the first pile pressing cylinder and the oil tank, and the control oil port of the third hydraulic lock is connected to the ninth oil circuit.

[0012] In one embodiment, the pile clamping force adaptive control device further includes a relief valve, which is connected between the first oil circuit and the eighth oil circuit, and the set pressure of the relief valve is less than the set pressure of the first pressure reducing valve.

[0013] In one embodiment, the pile clamping force adaptive control device further includes a fifth oil port, a sixth oil port, and a seventh oil port. The fifth oil port is connected to the second chamber of the pile clamping cylinder through an eighth oil circuit. The sixth oil port is connected to the fourth chamber of the first pile pressing cylinder through the ninth oil circuit. The seventh oil port is connected to the sixth chamber of the second pile pressing cylinder through a tenth oil circuit. The pile clamping force adaptive control device further includes a third hydraulic lock and a fifth hydraulic lock. The third hydraulic lock is connected between the third chamber of the first pile pressing cylinder and the oil tank, and the control oil port of the third hydraulic lock is connected to the ninth oil circuit. The fifth hydraulic lock is connected between the fifth chamber of the second pile pressing cylinder and the oil tank, and the control oil port of the fifth hydraulic lock is connected to the tenth oil circuit.

[0014] In one embodiment, the pile clamping force adaptive control device further includes a third pile pressing oil cylinder and a fourth oil port. The third pile pressing oil cylinder includes a seventh chamber and an eighth chamber. The fourth oil port is connected to the seventh chamber of the third pile pressing oil cylinder through a fourth oil path. The pile clamping force adaptive control device further includes a seventh oil path connected between the first oil path and the fourth oil path. A third pressure reducing valve is provided on the seventh oil path, and the set pressure of the third pressure reducing valve is greater than the set pressure of the second pressure reducing valve.

[0015] The present invention also provides a static pile driver, which includes the above-mentioned pile clamping force adaptive control device.

[0016] In the pile clamping force adaptive control device and the static pile driver of the present invention, by setting pressure reducing valves with different pressure reducing values, it is possible to automatically increase the pile clamping force as the number of pile pressing oil cylinders participating in pile pressing increases, that is, to make the pile clamping force adapt to the pile pressing force automatically without manual adjustment of the pile clamping force. This not only saves the auxiliary working time but also avoids the phenomena of slipping due to too small pile clamping force and breaking the pile due to too large pile clamping force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a hydraulic schematic diagram of the pile clamping force adaptive control device according to the first embodiment of the present invention.

[0018] Figure 2 It is a structural schematic diagram of the pile clamping force adaptive control device according to the second embodiment of the present invention.

[0019] Figure 3 It is a structural schematic diagram of the pile clamping force adaptive control device according to the third embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following combines the drawings and embodiments to detail the specific embodiments, structures, features, and their effects of the present invention as follows.

[0021] First Embodiment

[0022] As Figure 1As shown in the figure, the pile clamping force adaptive control device of the first embodiment of the present invention includes a pile clamping oil cylinder 11, a first pile pressing oil cylinder 13, a second pile pressing oil cylinder 15, a third pile pressing oil cylinder 17, a first oil port 19, a second oil port 21, a third oil port 23 and a fourth oil port 25. The pile clamping oil cylinder 11 includes a first chamber 112 and a second chamber 114. The first pile pressing oil cylinder 13 includes a third chamber 132 and a fourth chamber 134. The second pile pressing oil cylinder 15 includes a fifth chamber 152 and a sixth chamber 154. The third pile pressing oil cylinder 17 includes a seventh chamber 172 and an eighth chamber 174. The first oil port 19 is connected to the first chamber 112 through a first oil path 20. The second oil port 21 is connected to the third chamber 132 of the first pile pressing oil cylinder 13 through a second oil path 22. The third oil port 23 is connected to the fifth chamber 152 of the second pile pressing oil cylinder 15 through a third oil path 24. The fourth oil port 25 is connected to the seventh chamber 172 of the third pile pressing oil cylinder 17 through a fourth oil path 26. The pile clamping force adaptive control device further includes a fifth oil path 28 connected between the first oil path 20 and the second oil path 22, a sixth oil path 30 connected between the first oil path 20 and the third oil path 24, and a seventh oil path 32 connected between the first oil path 20 and the fourth oil path 26. A first pressure reducing valve 34a, a second pressure reducing valve 34b and a third pressure reducing valve 34c are respectively provided on the fifth oil path 28, the sixth oil path 30 and the seventh oil path 32. The set pressures of the first pressure reducing valve 34a, the second pressure reducing valve 34b and the third pressure reducing valve 34c increase in sequence.

[0023] In the pile clamping force adaptive control device of this embodiment, by setting three pressure reducing valves with different pressure reducing values, the pile clamping force can be automatically increased as the number of pile pressing oil cylinders participating in pile pressing increases, that is, the pile clamping force is adapted to the pile pressing force automatically without manual adjustment of the pile clamping force, which not only saves the auxiliary working time, but also avoids the phenomena of slipping due to too small pile clamping force and breaking the pile due to too large pile clamping force.

[0024] In this embodiment, check valves 36 are respectively provided on the fifth oil path 28, the sixth oil path 30 and the seventh oil path 32. By setting the check valves 36, the hydraulic oil can be prevented from flowing back from the first chamber 112 of the pile clamping oil cylinder 11 into each pile pressing oil cylinder.

[0025] In this embodiment, the pile clamping force adaptive control device further includes a fifth oil port 40, a sixth oil port 42, a seventh oil port 44, and an eighth oil port 46. The fifth oil port 40 is connected to the second chamber 114 of the pile clamping cylinder 11 through an eighth oil path 48. The sixth oil port 42 is connected to the fourth chamber 134 of the first pile pressing cylinder 13 through a ninth oil path 49. The seventh oil port 44 is connected to the sixth chamber 154 of the second pile pressing cylinder 15 through a tenth oil path 50. The eighth oil port 46 is connected to the eighth chamber 174 of the third pile pressing cylinder 17 through an eleventh oil path 51. Specifically, the first chamber 112, the third chamber 132, the fifth chamber 152, and the seventh chamber 172 may be rodless chambers (i.e., large chambers), and the second chamber 114, the fourth chamber 134, the sixth chamber 154, and the eighth chamber 174 may be rod chambers (i.e., small chambers). Moreover, when supplying oil to the first chamber 112, the third chamber 132, the fifth chamber 152, and the seventh chamber 172, the pile clamping cylinder 11 applies a pile clamping force, the pile pressing cylinders apply a pile pressing force, and the fifth oil port 40, the sixth oil port 42, the seventh oil port 44, and the eighth oil port 46 return oil. It can be understood that it can also be set that when supplying oil to the second chamber 114, the fourth chamber 134, the sixth chamber 154, and the eighth chamber 174, the pile clamping cylinder 11 applies a pile clamping force, the pile pressing cylinders apply a pile pressing force, and the fifth oil port 40, the sixth oil port 42, the seventh oil port 44, and the eighth oil port 46 return oil, which can be set according to needs.

[0026] In this embodiment, the pile clamping force adaptive control device further includes a twelfth oil path 53 and a thirteenth oil path 55. The twelfth oil path 53 is connected between the third oil path 24 and the tenth oil path 50. The thirteenth oil path 55 is connected between the fourth oil path 26 and the eleventh oil path 51. A first hydraulic lock 57 and a second hydraulic lock 58 are respectively provided on the twelfth oil path 53 and the thirteenth oil path 55. The control oil ports of the first hydraulic lock 57 and the second hydraulic lock 58 are both connected to the ninth oil path 49. In this way, when lifting the first pile pressing cylinder 13, the hydraulic oil enters the fourth chamber 134 from the sixth oil port 42. The high-pressure oil on the ninth oil path 49 will open the first hydraulic lock 57 and the second hydraulic lock 58, so that the hydraulic oil in the fifth chamber 152 of the second pile pressing cylinder 15 and the seventh chamber 172 of the third pile pressing cylinder 17 respectively flows to the sixth chamber 154 and the eighth chamber 174. While the cylinder rod of the first pile pressing cylinder 13 retracts, the cylinder rods of the second pile pressing cylinder 15 and the third pile pressing cylinder 17 retract. In this way, when lifting the pile pressing cylinder, only the first pile pressing cylinder 13 needs to be supplied with oil, which reduces the hydraulic oil flow required by the system, and further reduces the displacement of the required hydraulic pump, saving the system cost.

[0027] Specifically, the pile clamping force adaptive control device further includes a first control valve 60 and a second control valve 61. The first control valve 60 is disposed between the first hydraulic lock 57 and the ninth oil passage 49, and the second control valve 61 is disposed between the second hydraulic lock 58 and the ninth oil passage 49. Specifically, the first control valve 60 and the second control valve 61 can be electromagnetic directional control valves. More specifically, both the first control valve 60 and the second control valve 61 include a first position and a second position. In the first position, the first control valve 60 connects the first hydraulic lock 57 to the oil tank, and the second control valve 61 connects the second hydraulic lock 58 to the oil tank, draining the control oil ports of the first hydraulic lock 57 and the second hydraulic lock 58 to close the first hydraulic lock 57 and the second hydraulic lock 58. In the second position, the first control valve 60 connects the first hydraulic lock 57 to the ninth oil passage 49, and the second control valve 61 connects the second hydraulic lock 58 to the ninth oil passage 49, opening the first hydraulic lock 57 and the second hydraulic lock 58.

[0028] Specifically, a first one-way valve 63 is further provided on the twelfth oil passage 53, and a second one-way valve 64 is further provided on the thirteenth oil passage 55. The twelfth oil passage 53 and the thirteenth oil passage 55 are also connected to the oil tank.

[0029] In this embodiment, the pile clamping force adaptive control device further includes a third hydraulic lock 66. The third hydraulic lock 66 is connected between the third chamber 132 of the first pile pressing cylinder 13 and the oil tank, and the control oil port of the third hydraulic lock 66 is connected to the ninth oil passage 49. Through the third hydraulic lock 66, the hydraulic oil in the third chamber 132 can return oil when the hydraulic oil enters the fourth chamber 134 through the sixth oil port 42, so as to make up for the poor oil return caused by the existence of a throttle valve or the like in the oil passage connected to the second oil port 21. It can be understood that when the oil return of the second oil port 21 is smooth, the third hydraulic lock 66 can be omitted.

[0030] In this embodiment, the pile clamping force adaptive control device further includes a relief valve 68. The relief valve 68 is connected between the first oil passage 20 and the eighth oil passage 48, and the set pressure of the relief valve 68 is less than the set pressure of the first pressure reducing valve 34a.

[0031] In this embodiment, the pile clamping force adaptive control device further includes a fourth hydraulic lock 70. The fourth hydraulic lock 70 is disposed on the first oil passage 20, and the control oil port of the fourth hydraulic lock 70 is connected to the eighth oil passage 48. The setting of the fourth hydraulic lock 70 can lock the pile clamping cylinder 11 to prevent the pile clamping oil 11 from draining and loosening.

[0032] The working process of the pile clamping force adaptive control device will be specifically described below.

[0033] When pre-clamping a precast pile, the hydraulic oil enters the first chamber 112 of the pile clamping cylinder 11 through the first oil port 19, the fourth hydraulic lock 70, and the first oil circuit 20. The hydraulic oil in the second chamber 114 of the pile clamping cylinder 11 returns through the fifth oil port 40. The piston rod of the pile clamping cylinder 11 extends to clamp the precast pile, and the excess hydraulic oil returns through the overflow valve 68. The pile clamping cylinder 11 completes the pre-clamping of the precast pile. When driving the precast pile, the hydraulic oil enters the third chamber 132 of the first pile driving cylinder 13 through the second oil port 21. The hydraulic oil in the fourth chamber 134 of the first pile driving cylinder 13 returns through the sixth oil port 42. The piston rod of the first pile driving cylinder 13 extends to drive the precast pile into the foundation. At the same time, the hydraulic oil enters the first chamber 112 of the pile clamping cylinder 11 through the first pressure reducing valve 34a, and the pile clamping cylinder 11 increases the clamping force on the precast pile. When the pressure of the first pile driving cylinder 13 is insufficient to drive the precast pile into the foundation, the hydraulic oil enters the fifth chamber 152 of the second pile driving cylinder 15 through the third oil port 23. The hydraulic oil in the sixth chamber 154 of the second pile driving cylinder 15 returns through the seventh oil port 44. The piston rod of the second pile driving cylinder 15 extends, and the second pile driving cylinder 15 and the first pile driving cylinder 13 jointly drive the precast pile into the foundation. At the same time, the hydraulic oil enters the first chamber 112 of the pile clamping cylinder 11 through the second pressure reducing valve 34b, and the pile clamping cylinder 11 continues to increase the clamping force on the precast pile. When the pressures of the first pile driving cylinder 13 and the second pile driving cylinder 15 are insufficient to drive the precast pile into the foundation, the hydraulic oil enters the seventh chamber 172 of the third pile driving cylinder 17 through the fourth oil port 25. The hydraulic oil in the eighth chamber 174 of the third pile driving cylinder 17 returns through the eighth oil port 46. The piston rod of the third pile driving cylinder 17 extends, and the third pile driving cylinder 17, the second pile driving cylinder 15, and the first pile driving cylinder 13 jointly drive the precast pile into the foundation. At the same time, the hydraulic oil enters the first chamber 112 of the pile clamping cylinder 11 through the third pressure reducing valve 34c, and the pile clamping cylinder 11 continues to increase the clamping force on the precast pile. When the pile driving is completed, the hydraulic oil enters the second chamber 114 of the pile clamping cylinder 11 through the fifth oil port 40. The hydraulic oil in the first chamber 112 of the pile clamping cylinder 11 returns through the fourth hydraulic lock 70 and the first oil port 19. The piston rod of the pile clamping cylinder 11 retracts to release the precast pile.When lifting the pile pressing cylinder, the hydraulic oil enters the fourth chamber 134 of the first pile pressing cylinder 13 through the sixth oil port 42. The hydraulic oil in the third chamber 132 of the first pile pressing cylinder 13 returns oil through the third hydraulic lock 66 and the second oil port 21, and the cylinder rod of the first pile pressing cylinder 13 retracts. At the same time, the hydraulic oil pushes open the first hydraulic lock 57 after passing through the first control valve 60. The retraction of the cylinder rod of the first pile pressing cylinder 13 drives the retraction of the cylinder rod of the second pile pressing cylinder 15. The hydraulic oil in the fifth chamber 152 of the second pile pressing cylinder 15 enters the sixth chamber 154 of the second pile pressing cylinder 15 through the first hydraulic lock 57 and the first one-way valve 63 to replenish the hydraulic oil in the sixth chamber 154 of the second pile pressing cylinder 15. At the same time, the hydraulic oil pushes open the second hydraulic lock 58 after passing through the second control valve 61. The retraction of the cylinder rod of the first pile pressing cylinder 13 drives the retraction of the cylinder rod of the third pile pressing cylinder 17. The hydraulic oil in the seventh chamber 172 of the third pile pressing cylinder 17 enters the eighth chamber 174 of the third pile pressing cylinder 17 through the second hydraulic lock 58 and the second one-way valve 64 to replenish the hydraulic oil in the eighth chamber 174 of the third pile pressing cylinder 17.

[0034] Second Embodiment

[0035] The structure of the pile clamping force adaptive control device of the second embodiment of the present invention is similar to that of the pile clamping force adaptive control device of the first embodiment. The difference is that, please refer to Figure 2 , in the second embodiment, the pile clamping force adaptive control device only includes two pile pressing cylinders, namely the first pile pressing cylinder 13 and the second pile pressing cylinder 15. The other structures of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0036] Third Embodiment

[0037] The structure of the pile clamping force adaptive control device of the third embodiment of the present invention is similar to that of the pile clamping force adaptive control device of the first embodiment. The difference is that, please refer to Figure 3, in the third embodiment, the pile clamping force adaptive control device does not include the twelfth oil circuit 53 and the thirteenth oil circuit 55. The pile clamping force adaptive control device further includes a fifth hydraulic lock 72 and a sixth hydraulic lock 74. The fifth hydraulic lock 72 is connected between the fifth chamber 152 of the second pile pressing cylinder 15 and the oil tank, and the control oil port of the fifth hydraulic lock 72 is connected to the tenth oil circuit 50. The sixth hydraulic lock 74 is connected between the seventh chamber 172 of the third pile pressing cylinder 17 and the oil tank, and the control oil port of the sixth hydraulic lock 74 is connected to the eleventh oil circuit 51. The functions of the fifth hydraulic lock 72 and the sixth hydraulic lock 74 are the same as those of the third hydraulic lock 66, only for assisting in oil return, and will not connect the fifth chamber 152 and the sixth chamber 154 of the second pile pressing cylinder 15, nor will it connect the seventh chamber 172 and the eighth chamber 174 of the third pile pressing cylinder 17. That is, when lifting the pile pressing cylinder, pressure oil is supplied to the fourth chamber 134 of the first pile pressing cylinder 13, the sixth chamber 154 of the second pile pressing cylinder 15, and the eighth chamber 174 of the third pile pressing cylinder 17 respectively. The other structures of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0038] The present invention also provides a static pile driver, which includes any one of the above-mentioned pile clamping force adaptive control devices.

[0039] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the disclosed technical content within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A clamping pile force adaptive control device, characterized in that, it includes a clamping pile oil cylinder (11), a first pile pressing oil cylinder (13), a second pile pressing oil cylinder (15), a first oil port (19), a second oil port (21) and a third oil port (23). The clamping pile oil cylinder (11) includes a first chamber (112) and a second chamber (114). The first pile pressing oil cylinder (13) includes a third chamber (132) and a fourth chamber (134). The second pile pressing oil cylinder (15) includes a fifth chamber (152) and a sixth chamber (154). The first oil port (19) is connected to the first chamber (112) through a first oil path (20). The second oil port (21) is connected to the third chamber (132) through a second oil path (22). The third oil port (23) is connected to the fifth chamber (152) through a third oil path (24); The clamping pile force adaptive control device further includes a fifth oil path (28) connected between the first oil path (20) and the second oil path (22) and a sixth oil path (30) connected between the first oil path (20) and the third oil path (24). A first pressure reducing valve (34a) and a second pressure reducing valve (34b) are respectively arranged on the fifth oil path (28) and the sixth oil path (30). The set pressures of the first pressure reducing valve (34a) and the second pressure reducing valve (34b) increase in sequence; The clamping pile force adaptive control device further includes a fifth oil port (40), a sixth oil port (42), and a seventh oil port (44). The fifth oil port (40) is connected to the second chamber (114) of the clamping pile oil cylinder (11) through an eighth oil path (48). The sixth oil port (42) is connected to the fourth chamber (134) of the first pile pressing oil cylinder (13) through a ninth oil path (49). The seventh oil port (44) is connected to the sixth chamber (154) of the second pile pressing oil cylinder (15) through a tenth oil path (50). The clamping pile force adaptive control device further includes a twelfth oil path (53). The twelfth oil path (53) is connected between the third oil path (24) and the tenth oil path (50). A first hydraulic lock (57) is arranged on the twelfth oil path (53). The control oil port of the first hydraulic lock (57) is connected to the ninth oil path (49).

2. The clamping pile force adaptive control device according to claim 1, characterized in that, the clamping pile force adaptive control device further includes a first control valve (60). The first control valve (60) is arranged between the first hydraulic lock (57) and the ninth oil path (49).

3. The clamping pile force adaptive control device according to claim 2, characterized in that, the first control valve (60) includes a first position and a second position. In the first position, the first control valve (60) connects the first hydraulic lock (57) to the fuel tank, and the first hydraulic lock (57) is closed. In the second position, the first control valve (60) connects the first hydraulic lock (57) to the ninth oil path (49), and the first hydraulic lock (57) is opened.

4. The pile clamping force adaptive control device according to claim 1, characterized in that, a first one-way valve (63) is further provided on the twelfth oil circuit (53), and the twelfth oil circuit (53) is also connected to the fuel tank.

5. The pile clamping force adaptive control device according to claim 1, characterized in that, the pile clamping force adaptive control device further includes a third hydraulic lock (66), the third hydraulic lock (66) is connected between the third chamber (132) of the first pile pressing cylinder (13) and the fuel tank, and the control oil port of the third hydraulic lock (66) is connected to the ninth oil circuit (49).

6. The pile clamping force adaptive control device according to claim 1, characterized in that, the pile clamping force adaptive control device further includes a relief valve (68), the relief valve (68) is connected between the first oil circuit (20) and the eighth oil circuit (48), and the set pressure of the relief valve (68) is less than the set pressure of the first pressure reducing valve (34a).

7. The pile clamping force adaptive control device according to claim 6, characterized in that, the pile clamping force adaptive control device further includes a fifth oil port (40), a sixth oil port (42), and a seventh oil port (44). The fifth oil port (40) is connected to the second chamber (114) of the pile clamping cylinder (11) through the eighth oil circuit (48). The sixth oil port (42) is connected to the fourth chamber (134) of the first pile pressing cylinder (13) through the ninth oil circuit (49). The seventh oil port (44) is connected to the sixth chamber (154) of the second pile pressing cylinder (15) through the tenth oil circuit (50). The pile clamping force adaptive control device further includes a third hydraulic lock (66) and a fifth hydraulic lock (72). The third hydraulic lock (66) is connected between the third chamber (132) of the first pile pressing cylinder (13) and the fuel tank, and the control oil port of the third hydraulic lock (66) is connected to the ninth oil circuit (49). The fifth hydraulic lock (72) is connected between the fifth chamber (152) of the second pile pressing cylinder (15) and the fuel tank, and the control oil port of the fifth hydraulic lock (72) is connected to the tenth oil circuit (50).

8. The pile clamping force adaptive control device according to claim 1, characterized in that, the pile clamping force adaptive control device further includes a third pile pressing cylinder (17) and a fourth oil port (25). The third pile pressing cylinder (17) includes a seventh chamber (172) and an eighth chamber (174). The fourth oil port (25) is connected to the seventh chamber (172) of the third pile pressing cylinder (17) through the fourth oil circuit (26). The pile clamping force adaptive control device further includes a seventh oil circuit (32) connected between the first oil circuit (20) and the fourth oil circuit (26). A third pressure reducing valve (34c) is provided on the seventh oil circuit (32), and the set pressure of the third pressure reducing valve (34c) is greater than the set pressure of the second pressure reducing valve (34b).

9. A static pile driver, characterized in that, Comprising the pile clamping force adaptive control device according to any one of claims 1-8.

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