Clamp oil supply system and oil supply control method

Abstract

The application discloses a clamp oil supply system and an oil supply regulation method, and the clamp oil supply system comprises a drilling frame and a clamp assembly, the drilling frame comprises a first support, a second support and two clamp oil pipes, the clamp oil pipe comprises an inner pipe and an outer pipe which are relatively slidable, the inner pipe is communicated with a first oil supply channel in the bottom plate of the first support, the outer pipe is communicated with a second oil supply channel in the top plate of the second support, the clamp assembly comprises a clamp body and a clamp oil cylinder, the clamp oil cylinder is installed on the top plate of the second support, the second oil supply channel is communicated with the inner cavity of the clamp oil cylinder, and a hydraulic control check valve is installed in the channel for supplying oil to the rod cavity of the clamp oil cylinder. The clamp oil pipe is designed as a telescopic sleeve structure, the problem that the external oil pipe is easily hung off is solved, and the hydraulic control check valve is arranged, so that the clamp body has a self-locking function, and it is ensured that the clamp can always stably clamp the anchor rod.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mining machinery, and particularly relates to a clamp oil supply system and an oil supply control method. BACKGROUND

[0002] An anchor rod drilling machine is an indispensable device in mining, tunneling and underground engineering, mainly used for the installation and fixation of anchor rods to ensure the stability and safety of the engineering. In the anchor rod drilling machine, a clamp is usually installed on the drilling frame of the drilling machine and its opening and closing actions are controlled by hydraulic or mechanical means. The main function of the clamp is to firmly hold the anchor rod during the drilling process to prevent the anchor rod from slipping or deviating during high-speed rotation and advancement.

[0003] In the related art, the clamp oil cylinder is connected with a hydraulic hose which reciprocates with the drilling frame. However, the external pipeline is easily disturbed by external factors, such as the complex environment of the construction site, collision, wear and tear, etc., resulting in a high risk of the hydraulic hose being hung off. Moreover, after the clamp is closed and oil supply to the clamp oil cylinder is stopped, the clamp is in an unstable state that can be moved by external force, resulting in insufficient clamping force and the inability to effectively clamp the anchor rod. SUMMARY

[0004] The present application aims to at least partially solve one of the technical problems in the related art.

[0005] To this end, an embodiment of the present application proposes a clamp oil supply system which can enable the clamp to work safely and stably.

[0006] The clamp oil supply system of the embodiment of the present application comprises:

[0007] a drilling frame, the drilling frame comprising a first support, a second support and two clamp oil pipes, the first support being slidable along its length direction, the second support being slidably mounted on the first support along the length direction of the first support, the clamp oil pipe comprising an inner pipe and an outer pipe which are relatively slidable, the bottom end of the inner pipe being connected with the bottom plate of the first support, the bottom plate of the first support being provided with a first oil supply channel, the top end of the outer pipe being connected with the top plate of the second support, the top plate of the second support being provided with a second oil supply channel;

[0008] a clamp assembly, the clamp assembly comprising a clamp body and a clamp oil cylinder connected with each other, the clamp oil cylinder being mounted on the top plate of the second support, the second oil supply channel being in communication with the inner cavity of the clamp oil cylinder, and a hydraulic control check valve being installed in the channel of the second oil supply channel for supplying oil to the rod cavity of the clamp oil cylinder.

[0009] The clamp oil supply system of the embodiment of the present application is provided with a clamp oil pipe installed on a drilling rig, and the clamp oil pipe is designed as a telescopic sleeve structure and can move synchronously with the second support, thereby solving the problem that the external oil pipe is easily hung off in the related art and improving the reliability and safety of the device operation. In addition, the hydraulic control check valve is arranged to enable the clamp body to have a self-locking function, so that when the clamp clamps the anchor rod and stops oil supply, the clamp can always stably clamp the anchor rod, thereby improving the effectiveness of the construction operation.

[0010] In some embodiments, an overflow valve and a reversing valve are installed on the pipeline of the oil supply side of the first oil supply channel.

[0011] In some embodiments, the two clamp oil pipes include a rod cavity oil pipe and a rod cavity-free oil pipe, the first oil supply channel includes a first rod cavity oil supply channel and a first rod cavity-free oil supply channel, the second oil supply channel includes a second rod cavity oil supply channel and a second rod cavity-free oil supply channel, the first rod cavity oil supply channel, the rod cavity oil pipe and the second rod cavity oil supply channel jointly constitute a rod cavity oil supply channel of the clamp oil cylinder, and the first rod cavity-free oil supply channel, the rod cavity-free oil pipe and the second rod cavity-free oil supply channel jointly constitute a rod cavity-free oil supply channel of the clamp oil cylinder.

[0012] In some embodiments, the second rod cavity-free oil supply channel also communicates with a pilot oil passage of the hydraulic control check valve.

[0013] The rod cavity of the clamp oil cylinder is supplied with oil through the second rod cavity oil supply channel to enable the clamp body to be in a clamped state, and the hydraulic control check valve limits the backflow of the hydraulic oil in the rod cavity of the clamp oil cylinder.

[0014] The rod cavity-free cavity of the clamp oil cylinder is supplied with oil through the second rod cavity-free oil supply channel to enable the clamp to be in a released state, and part of the hydraulic oil in the second rod cavity-free oil supply channel flows to the pilot oil passage of the hydraulic control check valve to enable the hydraulic control check valve to be released from the limitation.

[0015] In some embodiments, the hydraulic control check valve has a port a, a port b and a port c, the hydraulic oil in the second rod cavity oil supply channel flows into the port b of the hydraulic control check valve and opens the hydraulic control check valve to supply the rod cavity of the clamp oil cylinder with oil through the port a of the hydraulic control check valve, and part of the hydraulic oil in the second rod cavity-free oil supply channel flows into the port c of the hydraulic control check valve and opens the hydraulic control check valve to enable the hydraulic oil in the rod cavity of the clamp oil cylinder to backflow through the port a and the port b of the hydraulic control check valve in sequence.

[0016] In some embodiments, a bottom end of the outer tube is provided with an outer tube flange, the outer tube flange is installed on a bottom plate of the second support, a bottom end of the inner tube is provided with an inner tube flange, the inner tube flange is installed on a bottom plate of the first support.

[0017] In some embodiments, a sealing groove is formed on an inner circumferential wall of the outer tube flange, an interface between the bottom plate of the first support and the inner tube flange, an interface between the top plate of the second support and the top end of the outer tube, and the sealing groove is provided with a sealing ring.

[0018] In some embodiments, the clamp assembly further comprises a guard plate, the guard plate is installed on the top plate of the second support, and the clamp oil cylinder is located between the guard plate and the top plate of the second support.

[0019] In some embodiments, corresponding assembly holes are formed between the guard plate and the top plate of the second support and between the clamp oil cylinder and the top plate of the second support, and a connecting piece is installed in the assembly hole.

[0020] Embodiments of the present application also provide an oil supply control method for the clamp oil supply system.

[0021] The oil supply control method of the embodiments of the present application comprises:

[0022] The minimum resistance of the piston rod of the clamp oil cylinder to the movement of the clamp body is defined as F J The minimum pressure required to drive the clamp body to open is defined as P JZ The minimum pressure required to drive the clamp body to close is defined as P JB The relationship is satisfied:

[0023]

[0024]

[0025] Wherein, A JW A is the rodless cavity area of the clamp oil cylinder, A JY B is the rod cavity area of the clamp oil cylinder;

[0026] If the rod cavity area of the clamp oil cylinder is less than the rodless cavity area of the clamp oil cylinder, then P JB B is greater than A P JZ The minimum pressure required to drive the clamp body to normally act is the minimum pressure required to drive the clamp body to close PJB , then the minimum pressure in the clamp oil pipe is P JB

[0027] The pushing force of the inner pipe of the clamp oil pipe is defined as F G , then the relationship is satisfied:

[0028]

[0029] Wherein, A NG is the cross-sectional area of the inner pipe of the clamp oil pipe;

[0030] , the pushing force of the inner pipe of the clamp oil pipe is adjusted by adjusting the rod cavity area of the clamp oil cylinder A JY and the cross-sectional area of the inner pipe of the clamp oil pipe A NG , the pushing force of the inner pipe of the clamp oil pipe during the working process of the clamp body is adjusted F G .

[0031] The oil supply control method of the embodiment of the present application adjusts the pushing force of the inner pipe of the clamp oil pipe by adjusting the size of the rod cavity of the clamp oil cylinder and the inner pipe of the clamp oil pipe, thereby reducing the sudden change of the first stroke pushing force of the clamp oil pipe to the drilling rig. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic view of the drilling rig in the initial state of the embodiment of the present application.

[0033] Figure 2 is a schematic view of the drilling rig in the unfolded state of the embodiment of the present application.

[0034] Figure 3 is a hydraulic principle schematic view of the clamp of the embodiment of the present application.

[0035] Figure 4 is a hydraulic principle schematic view of the clamp of the embodiment of the present application.

[0036] Figure 5 is a hydraulic principle schematic view of the clamp of the embodiment of the present application.

[0037] Figure 6 is a first schematic view of the oil supply channel in the second support top plate of the embodiment of the present application.

[0038] Figure 7 is a second schematic view of the oil supply channel in the second support top plate of the embodiment of the present application.

[0039] Figure 8 ​This is a third schematic diagram of the oil supply channel in the top plate of the second bracket according to an embodiment of the present invention.

[0040] Reference numerals:

[0041] 1-oil tank, 2-drilling rig, 21-first bracket, 211-first rod chamber oil supply channel, 212-first rodless chamber oil supply channel, 22-second bracket, 221-second rod chamber oil supply channel, 222-second rodless chamber oil supply channel, 23-clamp oil pipe, 231-inner pipe, 232-outer pipe, 233-rod chamber oil pipe, 234-rodless chamber oil pipe, 3-clamp assembly, 31-clamp body, 32-clamp cylinder, 33-guard plate, 4-hydraulic controlled one-way valve, 401-pilot oil circuit, 5-overflow valve, 6-reversing valve. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0043] The clamp oil supply system according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0044] like Figures 1 to 8 As shown, the clamp oil supply system of the embodiment of the present invention includes: an oil tank 1, a drill frame 2 and a clamp assembly 3.

[0045] The oil tank 1 is used for draining oil from the system.

[0046] The drilling rig 2 includes a first bracket 21, a second bracket 22, and two clamped oil pipes 23. The first bracket 21 is slidable along its length, and the second bracket 22 is slidably mounted on the first bracket 21 along the length of the first bracket 21. Optionally, both the first bracket 21 and the second bracket 22 are composed of a bottom plate, a top plate, and a support plate connecting the two. The support plate of the first bracket 21 is a telescopic plate with a slidable design to meet different construction requirements, increasing the applicability and flexibility of the device. The second bracket 22 moves between the bottom plate and the top plate of the first bracket 21.

[0047] The clamp oil pipe 23 comprises an inner tube 231 and an outer tube 232, which can slide relative to each other. The bottom end of the inner tube 231 is connected to the bottom plate of the first bracket 21, and the top end of the outer tube 232 is connected to the top plate of the second bracket 22. This allows the clamp oil pipe 23 to extend and retract during movement of the second bracket 22. A first oil supply channel is provided in the bottom plate of the first bracket 21, and a second oil supply channel is provided in the top plate of the second bracket 22. Hydraulic oil flows sequentially through the first oil supply channel, the clamp oil pipe 23, and the second oil supply channel to the clamp cylinder 32, and vice versa.

[0048] The clamp assembly 3 comprises a clamp body 31 and a clamp oil cylinder 32 connected with the clamp body 31 to drive the clamp body 31 to open and close. The clamp oil cylinder 32 is installed on the top plate of the second support 22, the second oil supply channel is in communication with the inner cavity of the clamp oil cylinder 32, and the liquid control check valve 4 is installed in the channel for supplying oil to the rod cavity of the clamp oil cylinder 32.

[0049] The clamp oil pipe 23 is installed on the drilling rig 2, and the clamp oil pipe 23 is designed as a telescopic sleeve structure and can move synchronously with the second support 22, thereby solving the problem that the external oil pipe is easily hung off in the related art and improving the reliability and safety of the device operation.

[0050] In addition, the liquid control check valve 4 is arranged to enable the clamp to have a self-locking function, so that when the clamp clamps the anchor rod and stops supplying oil, the clamp can always stably clamp the anchor rod, thereby improving the effectiveness of the construction operation.

[0051] In some embodiments, as shown in Figures 3 to 5 the overflow valve 5 and the reversing valve 6 are installed on the pipeline of the oil supply side of the first oil supply channel.

[0052] It can be understood that the overflow valve 5 is used to limit the maximum pressure provided to the clamp oil cylinder 32, so as to ensure that the thrust of the inner pipe 231 of the clamp oil pipe 23 extending outward is not too large, thereby avoiding affecting the normal drilling work of the drilling machine.

[0053] The reversing valve 6 is used to change the flow direction of the hydraulic oil, so as to realize the change of the movement direction of the clamp oil cylinder 32, so that the clamp body 31 is opened or closed. For example, as shown in Figure 4 the piston rod of the clamp oil cylinder 32 extends, and the clamp body 31 is in an open state. As shown in Figure 5 the piston rod of the clamp oil cylinder 32 is retracted, and the clamp body 31 is in a closed state.

[0054] In some embodiments, as shown in Figures 3 to 8 the two clamp oil pipes 23 comprise a rod cavity oil pipe 233 and a rodless cavity oil pipe 234, the first oil supply channel comprises a first rod cavity oil supply channel 211 and a first rodless cavity oil supply channel 212, and the second oil supply channel comprises a second rod cavity oil supply channel 221 and a second rodless cavity oil supply channel 222.

[0055] The first rod cavity oil supply channel 211, the rod cavity oil pipe 233 and the second rod cavity oil supply channel 221 jointly constitute a rod cavity oil supply channel of the clamp oil cylinder 32, and the first rodless cavity oil supply channel 212, the rodless cavity oil pipe 234 and the second rodless cavity oil supply channel 222 jointly constitute a rodless cavity oil supply channel of the clamp oil cylinder 32.

[0056] And, the second rodless chamber oil supply passage 222 also communicates with the pilot oil passage 401 of the hydraulic control check valve 4.

[0057] It can be understood that, by supplying oil to the rod chamber of the clamp cylinder 32 through the second rod chamber oil supply passage to close the clamp body 31, the supply of oil is stopped after the clamp body 31 is closed, at this time the hydraulic control check valve 4 is in a closed state, and under the restriction of the hydraulic control check valve 4, the hydraulic oil in the rod chamber of the clamp cylinder 32 cannot flow back.

[0058] By supplying oil to the rodless chamber of the clamp cylinder 32 through the second rodless chamber oil supply passage to open the clamp, at this time part of the hydraulic oil in the second rodless chamber oil supply passage flows to the pilot oil passage 401 of the hydraulic control check valve 4, thereby opening the hydraulic control check valve 4 to remove the restriction of the hydraulic control check valve 4, so that the hydraulic oil in the rod chamber of the clamp cylinder 32 flows back and discharges.

[0059] Optionally, as shown in Figures 3 to 5 The hydraulic control check valve 4 has a port a, a port b and a port c.

[0060] When oil is supplied to the rod chamber of the clamp cylinder 32, the hydraulic oil in the second rod chamber oil supply passage flows into the port b of the hydraulic control check valve 4 and opens the hydraulic control check valve 4, and then supplies oil to the rod chamber of the clamp cylinder 32 through the port a of the hydraulic control check valve 4. After stopping the supply of oil, the hydraulic control check valve 4 is closed, thereby ensuring that the hydraulic oil in the rod chamber cannot flow back to lock the clamp body 31.

[0061] When oil is supplied to the rodless chamber of the clamp cylinder 32, part of the hydraulic oil in the second rodless chamber oil supply passage flows to the port c of the hydraulic control check valve 4 to make the port c of the hydraulic control check valve 4 in a high pressure state, thereby opening the hydraulic control check valve 4 to make the hydraulic oil in the rod chamber of the clamp cylinder 32 flow from the port a to the port b of the hydraulic control check valve 4 to realize the backflow of the hydraulic oil in the rod chamber.

[0062] In some embodiments, as shown in Figure 1 and Figure 2 The bottom end of the outer tube 232 is provided with an outer tube 232 flange which is installed in an interface on the bottom plate of the second bracket 22. The bottom end of the inner tube 231 is provided with an inner tube 231 flange which is installed in an interface on the bottom plate of the first bracket 21. The outer tube 232 flange and the inner tube 231 flange are connected by screws.

[0063] Further, a sealing groove is formed on the interface between the bottom plate of the first bracket 21 and the inner tube 231 flange, the interface between the top plate of the second bracket 22 and the top end of the outer tube 232, and the inner circumferential wall of the outer tube 232 flange, and a sealing ring is installed in the sealing groove to ensure the sealing of the connection.

[0064] In some embodiments, as shown inFigure 1 And Figure 2 As shown in the figure, the clamp assembly 3 further comprises a guard plate 33, which is installed on the top plate of the second support 22, and the clamp oil cylinder 32 is located between the guard plate 33 and the top plate of the second support 22, thereby playing a role in protecting the clamp oil cylinder 32 and avoiding damage to the clamp oil cylinder 32 caused by external factors (falling rocks, etc.) during construction.

[0065] Optionally, corresponding assembly holes are formed between the guard plate 33 and the top plate of the second support 22 and between the clamp oil cylinder 32 and the top plate of the second support 22, and connecting pieces are installed in the assembly holes. For example, the assembly holes are threaded holes, and the connecting pieces are bolts. The guard plate 33 and the clamp oil cylinder 32 are detachably connected to the top plate of the second support 22 by means of bolt connection.

[0066] The oil supply regulation method of the embodiment of the present application is described below. The oil supply regulation method of the embodiment of the present application is used in the clamp oil supply system in any of the above embodiments.

[0067] It should be noted that, during the oil supply to the clamp oil cylinder 32, the oil pressure in the clamp oil pipe 23 will cause the inner pipe 231 of the clamp oil pipe 23 to have a tendency to stretch out. During drilling, it is necessary to control this stretching-out thrust. If the thrust is too large, it will generate a large additional thrust on the first-stage travel (the first support 21 is unfolded) of the drilling rig 2, which is not conducive to the normal operation of the drilling rig 2.

[0068] The oil supply regulation method of the embodiment of the present application comprises:

[0069] The clamp oil cylinder 32 is used to drive the opening and closing of the clamp body 31. The thrust of the piston rod of the clamp oil cylinder 32 must overcome the resistance to the movement of the clamp body 31 F J , so as to work normally, that is F J is the minimum value for the normal operation of the clamp body 31.

[0070] The minimum pressure required to drive the clamp body 31 to open is defined as P JZ , and the relationship is satisfied:

[0071]

[0072] The minimum pressure required to drive the clamp body 31 to close is defined as P JB , and the relationship is satisfied:

[0073]

[0074] , wherein A JWThe rodless cavity area of the clamp cylinder 32, A JY The rod cavity area of the clamp cylinder 32.

[0075] If the rod cavity area of the clamp cylinder 32 is less than the rodless cavity area of the clamp cylinder 32, P JB Greater than P JZ The minimum pressure in the clamp oil pipe 23 is the minimum pressure required to drive the clamp body 31 to close P JB The minimum pressure in the clamp oil pipe 23 is P JB .

[0076] The thrust of the inner tube 231 of the clamp oil pipe 23 is defined as F G Then the relationship is satisfied:

[0077]

[0078] Wherein, A NG The cross-sectional area of the inner tube 231 of the clamp oil pipe 23.

[0079] Then by adjusting the rod cavity area of the clamp cylinder 32 A JY And the cross-sectional area of the inner tube 231 of the clamp oil pipe 23 A NG The thrust of the inner tube 231 of the clamp oil pipe 23 during the operation of the clamp body 31 is adjusted F G .

[0080] Therefore, the oil supply control method of the embodiment of the present application increases the rod cavity area of the clamp cylinder 32 A JY , reduces the cross-sectional area of the inner tube 231 of the clamp oil pipe 23 A NG , thereby reducing the thrust of the inner tube 231 of the clamp oil pipe 23 during the operation of the clamp body 31, and further reducing the sudden change of the first stroke thrust of the clamp oil pipe 23 to the drilling rig 2.

[0081] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated thereby must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0082] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated thereby. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0083] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or in communication with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0084] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0085] In this disclosure, the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. The illustrative appearances of the above-mentioned terms in various places in the specification are not necessarily referred to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the terms "comprising", "containing", "having" or "including" and their derivatives, mean "including but not limited to". The terms "coupled" and "connected", along with their derivatives, mean "directly or indirectly connected".

[0086] Although the above-mentioned embodiments have been shown and described, it is to be understood that the above-mentioned embodiments are exemplary, and are not to be construed as limiting the present disclosure, and the changes, modifications, replacements and variations made by those skilled in the art to the above-mentioned embodiments are within the protection scope of the present disclosure.

Claims

1. A clamp oil supply system, characterized in that: include: A drilling rig, the drilling rig comprising a first bracket, a second bracket, and two clamp oil pipes, the first bracket being slidable along its length, the second bracket being slidably mounted on the first bracket along its length, the clamp oil pipes comprising an inner tube and an outer tube that are relatively slidable, the bottom end of the inner tube being connected to a bottom plate of the first bracket, a first oil supply passage being provided in the bottom plate of the first bracket, the top end of the outer tube being connected to a top plate of the second bracket, a second oil supply passage being provided in the top plate of the second bracket; A clamp assembly, wherein the clamp assembly includes a connected clamp body and a clamp oil cylinder, the two clamp oil pipes include a rod chamber oil pipe and a rodless chamber oil pipe, the first oil supply channel includes a first rod chamber oil supply channel and a first rodless chamber oil supply channel, the second oil supply channel includes a second rod chamber oil supply channel and a second rodless chamber oil supply channel, the first rod chamber oil supply channel, the rod chamber oil pipe and the second rod chamber oil supply channel together constitute the rod chamber oil supply channel of the clamp oil cylinder, the first rodless chamber oil supply channel, the rodless chamber oil pipe and the second rodless chamber oil supply channel together constitute the rodless chamber oil supply channel of the clamp oil cylinder; The clamp oil cylinder is mounted on the top plate of the second bracket, the second oil supply channel is connected to the inner cavity of the clamp oil cylinder, and a hydraulically controlled one-way valve is installed in the oil supply channel of the rod cavity of the clamp oil cylinder from the second oil supply channel; The second rodless chamber oil supply channel is also connected to the pilot oil circuit of the hydraulically controlled one-way valve; supplying oil to the rod chamber of the clamp oil cylinder through the second rod chamber oil supply passage to keep the clamp body in a clamped state, and limiting backflow of hydraulic oil in the rod chamber of the clamp oil cylinder by the hydraulically controlled one-way valve; Oil is supplied to the rodless chamber of the clamp cylinder through the second rodless chamber oil supply channel to put the clamp in a loosened state, and part of the hydraulic oil in the second rodless chamber oil supply channel flows to the pilot oil circuit of the hydraulically controlled one-way valve to release the restriction of the hydraulically controlled one-way valve.

2. The clamp oil supply system according to claim 1, characterized in that: An overflow valve and a reversing valve are installed on the pipeline on the oil supply side of the first oil supply channel.

3. The clamp oil supply system according to claim 1, characterized in that: The hydraulically controlled one-way valve has port a, port b and port c. The hydraulic oil in the second rod chamber oil supply channel flows into from port b of the hydraulically controlled one-way valve and opens the hydraulically controlled one-way valve to supply oil to the rod chamber of the clamp cylinder through port a of the hydraulically controlled one-way valve. Part of the hydraulic oil in the second rodless chamber oil supply channel flows into from port c of the hydraulically controlled one-way valve and opens the hydraulically controlled one-way valve to allow the hydraulic oil in the rod chamber of the clamp cylinder to flow back through ports a and b of the hydraulically controlled one-way valve in turn.

4. The clamp oil supply system according to claim 1, characterized in that: An outer tube flange is installed at the bottom end of the outer tube, and the outer tube flange is installed on the bottom plate of the second bracket. An inner tube flange is installed at the bottom end of the inner tube, and the inner tube flange is installed on the bottom plate of the first bracket.

5. The clamp oil supply system according to claim 4, characterized in that: Annular sealing grooves are provided at the interface between the bottom plate of the first bracket and the inner tube flange, at the interface between the top plate of the second bracket and the top end of the outer tube, and on the inner circumferential wall of the outer tube flange, and sealing rings are installed in the sealing grooves.

6. The clamp oil supply system according to claim 1, characterized in that: The clamp assembly further includes a guard plate mounted on the top plate of the second bracket, and the clamp cylinder is located between the guard plate and the top plate of the second bracket.

7. The clamp oil supply system according to claim 6, characterized in that: Corresponding assembly holes are provided between the guard plate and the top plate of the second bracket, and between the clamp oil cylinder and the top plate of the second bracket, and connecting pieces are installed in the assembly holes.

8. A method for controlling oil supply, characterized in that: The oil supply control method is used for the clamp oil supply system according to any one of claims 1 to 7, and the oil supply control method includes: The minimum resistance of the clamp cylinder piston rod to push the clamp body is defined as F J The minimum pressure required to open the clamp body is defined as P JZ , the minimum pressure required to drive the clamp body to close is defined as P JB , then the relationship is satisfied: in, A JW is the rodless cavity area of ​​the clamp cylinder, A JY is the rod cavity area of ​​the clamp cylinder; If the area of ​​the rod cavity of the clamp cylinder is smaller than the area of ​​the rodless cavity of the clamp cylinder, then P JB Greater than P JZ The minimum pressure required to drive the clamp body to close is the minimum pressure required to drive the clamp body to close. P JB , then the minimum pressure in the clamp oil pipe is P JB ; The thrust force that pushes the inner tube of the clamp oil pipe outward is defined as F G , then the relationship is satisfied: in, A NG is the cross-sectional area of ​​the inner tube of the clamp oil pipe; By adjusting the rod cavity area of ​​the clamp cylinder A JY And the cross-sectional area of ​​the inner tube of the clamp oil pipe A NG , adjust the thrust of the inner tube of the clamp oil pipe extending outward during the working process of the clamp body F G .

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