Clamp oil supply system and oil supply regulation and control method

Abstract

The clamp oil supply system comprises a drilling rig and a clamp assembly, the drilling rig comprises a first support, a second support and two clamp oil pipes, each clamp oil pipe comprises an inner pipe and an outer pipe which can slide relatively, the inner pipe is communicated with a first oil supply channel in a bottom plate of the first support, and the outer pipe is communicated with a second oil supply channel in a bottom plate of the second support. The outer pipe is communicated with a second oil supply channel in a 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 an inner cavity of the clamp oil cylinder, and a hydraulic control one-way valve is installed in a channel, supplying oil to a rod cavity of the clamp oil cylinder, of the second oil supply channel. The clamp oil pipe is designed to be of a telescopic sleeve structure, the problem that an external oil pipe is prone to being hung off is solved, the hydraulic control one-way valve is arranged so that the clamp body can have the self-locking function, and it is ensured that the clamp can stably clamp an anchor rod all the time.

Description

Technical Field

[0001] The invention relates to the technical field of mining machinery, and in particular to a clamp oil supply system and an oil supply control method. Background Art

[0002] Anchor drilling rigs are indispensable equipment in mines, tunnels and underground projects. They are mainly used to install and fix anchors to ensure the stability and safety of the project. In anchor drilling rigs, clamps are usually installed on the drilling frame of the drilling rig, and their opening and closing movements are controlled by hydraulic or mechanical means. The main function of the clamp is to firmly clamp the anchor during the drilling process to prevent the anchor from sliding or deflecting during high-speed rotation and advancement.

[0003] In the related art, the hydraulic hose connected to the clamp cylinder reciprocates with the drilling rig. However, the external pipe is easily disturbed by external factors, such as the complex environment, collision, wear, etc. at the construction site, resulting in a greater risk of the hydraulic hose being hung up. In addition, after the clamp is closed and the oil supply to the clamp cylinder stops, the clamp is in an unstable state that can be moved by external forces, resulting in insufficient clamping force and failure to effectively clamp the anchor rod. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides 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 invention comprises:

[0007] A drilling rack, the drilling rack comprising a first bracket, a second bracket and two clamp oil pipes, the first bracket being slidable along its length direction, the second bracket being slidably mounted on the first bracket along its length direction, 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 to a bottom plate of the first bracket, a first oil supply channel being provided in the bottom plate of the first bracket, the top end of the outer pipe being connected to a top plate of the second bracket, a second oil supply channel being provided in the top plate of the second bracket;

[0008] The clamp assembly includes a connected clamp body and a clamp cylinder, the clamp cylinder is installed on the top plate of the second bracket, the second oil supply channel is connected to the inner cavity of the clamp cylinder, and a hydraulically controlled one-way valve is installed in the channel through which the second oil supply channel supplies oil to the rod cavity of the clamp cylinder.

[0009] In the clamp oil supply system of the embodiment of the present invention, the clamp oil pipe is installed on the drilling rig, and the clamp oil pipe is designed as a telescopic sleeve structure, which can move synchronously with the second bracket, solving the problem that the external oil pipe is easy to be hung up in the related art, and improving the reliability and safety of the device operation. In addition, by setting a hydraulically controlled one-way valve, the clamp body has a self-locking function, ensuring 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.

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

[0011] In some embodiments, 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 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 cylinder.

[0012] In some embodiments, the second rodless chamber oil supply channel is also connected to the pilot oil circuit of the hydraulically controlled one-way valve;

[0013] Supplying oil to the rod chamber of the clamp oil cylinder through the second rod chamber passage to put the clamp body in a clamping state, and the hydraulically controlled one-way valve restricts the hydraulic oil in the rod chamber of the clamp oil cylinder from flowing back;

[0014] Oil is supplied to the rodless chamber of the clamp cylinder through the second rodless chamber channel to put the clamp in a loosened state, and part of the hydraulic oil in the second rodless chamber 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.

[0015] In some embodiments, the hydraulically controlled one-way valve has port a, port b and port c. The hydraulic oil in the second rod chamber 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 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.

[0016] In some embodiments, 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.

[0017] In some embodiments, 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.

[0018] In some embodiments, the clamp assembly further includes a guard plate, wherein the guard plate is mounted on a top plate of the second bracket, and the clamp cylinder is located between the guard plate and the top plate of the second bracket.

[0019] In some embodiments, corresponding assembly holes are provided between the guard plate and the top plate of the second bracket and between the clamp cylinder and the top plate of the second bracket, and connecting parts are installed in the assembly holes.

[0020] An embodiment of the present invention further provides an oil supply control method, which is used for the clamp oil supply system described in any one of the above embodiments.

[0021] The oil supply control method of the embodiment of the present invention includes:

[0022] The minimum resistance of the piston rod of the clamp cylinder 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:

[0023]

[0024]

[0025] Among them, A JW A is the rodless cavity area of ​​the clamp cylinder, JY is the rod cavity area of ​​the clamp cylinder;

[0026] 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 P JB , then the minimum pressure in the clamp oil pipe is P JB ;

[0027] The thrust force that extends the inner tube of the clamp oil pipe outward is defined as F G , then the relationship is satisfied:

[0028]

[0029] Among them, ANG is the cross-sectional area of ​​the inner tube of the clamp oil pipe;

[0030] By adjusting the rod cavity area A of the clamp cylinder JY And the cross-sectional area A of the inner tube of the clamp oil pipe NG , adjust the thrust F of the inner tube of the clamp oil pipe extending outward during the operation of the clamp body G .

[0031] The oil supply control method of the embodiment of the present invention adjusts the size of the rod cavity of the clamp oil cylinder and the inner tube of the clamp oil tube, thereby adjusting the thrust of the inner tube of the clamp oil tube extending outward, thereby reducing the sudden change effect of the clamp oil tube on the primary stroke propulsion force of the drilling rig. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the drilling rig in an initial state according to an embodiment of the present invention.

[0033] Figure 2 It is a schematic diagram of the drilling rig according to an embodiment of the present invention in an unfolded state.

[0034] Figure 3 Schematic diagram of the hydraulic principle of the clamp according to an embodiment of the present invention.

[0035] Figure 4 It is a schematic diagram of the hydraulic principle of the clamp opening according to an embodiment of the present invention.

[0036] Figure 5 It is a schematic diagram of the hydraulic principle of closing the drilling rig according to an embodiment of the present invention.

[0037] Figure 6 It is a first schematic diagram of the oil supply channel in the top plate of the second bracket according to an embodiment of the present invention.

[0038] Figure 7 4 is a second schematic diagram of the oil supply channel in the top plate of the second bracket according to an embodiment of the present invention.

[0039] Figure 8 3 is a third schematic diagram of the oil supply passage 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 rack, 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 oil cylinder, 33-guard plate, 4-hydraulic controlled one-way valve, 401-pilot oil circuit, 5-overflow valve, 6-reversing valve. DETAILED DESCRIPTION

[0042] 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 clamp oil pipes 23. The first bracket 21 is slidable along its length direction, and the second bracket 22 is slidably mounted on the first bracket 21 along the length direction of the first bracket 21. Optionally, both the first bracket 21 and the second bracket 22 are composed of a bottom plate and a top plate and a support plate connecting the two. The support plate of the first bracket 21 is a telescopic plate, and the slidable design meets 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 includes an inner pipe 231 and an outer pipe 232 that can slide relative to each other. The bottom end of the inner pipe 231 is connected to the bottom plate of the first bracket 21, and the top end of the outer pipe 232 is connected to the top plate of the second bracket 22, so that the clamp oil pipe 23 can be driven to extend and retract during the 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, so that the hydraulic oil can flow to the clamp oil cylinder 32 or flow out of the clamp oil cylinder 32 in reverse order through the first oil supply channel, the clamp oil pipe 23 and the second oil supply channel in sequence.

[0048] The clamp assembly 3 includes a clamp body 31 and a clamp cylinder 32, and the clamp cylinder 32 is connected to the clamp body 31 to drive the clamp body 31 to open and close. The clamp cylinder 32 is installed on the top plate of the second bracket 22, the second oil supply channel is connected to the inner cavity of the clamp cylinder 32, and a hydraulically controlled one-way valve 4 is installed in the channel where the second oil supply channel supplies oil to the rod cavity of the clamp cylinder 32.

[0049] The clamp oil supply system of the embodiment of the present invention, 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, which can move synchronously with the second bracket 22, thereby solving the problem of the external oil pipe being easily hung up in the related technology and improving the reliability and safety of the device operation.

[0050] Furthermore, by providing a hydraulically controlled one-way valve 4, the clamp has a self-locking function, ensuring 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 work.

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

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

[0053] The reversing valve 6 is used to change the flow direction of the hydraulic oil, thereby changing the movement direction of the clamp cylinder 32 to open or close the clamp body 31. Figure 4 As shown in FIG. 1 , the piston rod of the clamp oil cylinder 32 is extended, and the clamp body 31 is in an open state. Figure 5 As shown, the piston rod of the clamp cylinder 32 is retracted and the clamp body 31 is in a closed state.

[0054] In some embodiments, Figures 3 to 8 As shown, the two clamp oil pipes 23 include a rod chamber oil pipe 233 and a rodless chamber oil pipe 234, the first oil supply channel includes a first rod chamber oil supply channel 211 and a first rodless chamber oil supply channel 212, and the second oil supply channel includes a second rod chamber oil supply channel 221 and a second rodless chamber oil supply channel 222.

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

[0056] Furthermore, the second rodless chamber oil supply passage 222 is also communicated with the pilot oil passage 401 of the hydraulically controlled one-way valve 4 .

[0057] It can be understood that oil is supplied to the rod chamber of the clamp cylinder 32 through the second rod chamber channel to close the clamp body 31, and the oil supply is stopped after the clamp body 31 is closed. At this time, the hydraulically controlled one-way valve 4 is in a closed state. Under the limiting action of the hydraulically controlled one-way valve 4, the hydraulic oil in the rod chamber of the clamp cylinder 32 will not flow back.

[0058] Oil is supplied to the rodless chamber of the clamp cylinder 32 through the second rodless chamber channel to open the clamp. At this time, part of the hydraulic oil in the second rodless chamber channel flows to the pilot oil circuit 401 of the hydraulically controlled one-way valve 4, thereby opening the hydraulically controlled one-way valve 4 to release the restriction of the hydraulically controlled one-way valve 4 and allow the hydraulic oil in the rod chamber of the clamp cylinder 32 to flow back and be discharged.

[0059] Alternatively, if Figures 3 to 5 As shown, the hydraulically controlled one-way 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 oil cylinder 32, the hydraulic oil in the second rod chamber channel flows into from the port b of the hydraulically controlled one-way valve 4 and opens the hydraulically controlled one-way valve 4, and then supplies oil to the rod chamber of the clamp oil cylinder 32 through the port a of the hydraulically controlled one-way valve 4. After the oil supply stops, the hydraulically controlled one-way valve 4 is closed, thereby ensuring that the hydraulic oil in the rod chamber does not flow back, so as 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 channel flows to the c port of the hydraulically controlled one-way valve 4, so that the c port of the hydraulically controlled one-way valve 4 is in a high-pressure state, and the hydraulically controlled one-way valve 4 is opened to allow the hydraulic oil in the rod chamber of the clamp cylinder 32 to flow from the a port to the b port of the hydraulically controlled one-way valve 4, thereby realizing the reflux of the hydraulic oil in the rod chamber.

[0062] In some embodiments, Figure 1 and Figure 2 As shown, the outer tube 232 flange is installed at the bottom end of the outer tube 232, and the outer tube 232 flange is installed in the interface on the bottom plate of the second bracket 22. The inner tube 231 flange is installed at the bottom end of the inner tube 231, and the inner tube 231 flange is installed in the 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] Furthermore, annular sealing grooves are provided at the interface between the bottom plate of the first bracket 21 and the flange of the inner tube 231, at the interface between the top plate of the second bracket 22 and the top end of the outer tube 232, and on the inner circumferential wall of the flange of the outer tube 232. Sealing rings are installed in the sealing grooves to ensure the sealing of the connections.

[0064] In some embodiments, Figure 1 and Figure 2 As shown, the clamp assembly 3 also includes a guard plate 33, which is installed on the top plate of the second bracket 22. The clamp cylinder 32 is located between the guard plate 33 and the top plate of the second bracket 22, thereby protecting the clamp cylinder 32 and preventing external factors (such as broken rocks) from damaging the clamp cylinder 32 during construction.

[0065] Optionally, corresponding assembly holes are provided between the guard plate 33 and the top plate of the second bracket 22 and between the clamp oil cylinder 32 and the top plate of the second bracket 22, and connecting members are installed in the assembly holes. For example, the assembly holes are screw holes, and the connecting members are bolts, and the guard plate 33 and the clamp oil cylinder 32 are detachably connected to the top plate of the second bracket 22 by bolt connection.

[0066] The oil supply control method according to an embodiment of the present invention is described below. The oil supply control method according to an embodiment of the present invention is used for the clamp oil supply system in any of the above embodiments.

[0067] It should be noted that, during the process of supplying oil to the clamp oil cylinder 32, the oil pressure in the clamp oil pipe 23 will cause the inner tube 231 of the clamp oil pipe 23 to have a tendency to extend. During the drilling process, the thrust of the extension needs to be controlled. If the thrust is too large, it will generate a large additional thrust on the primary stroke of the drilling rig 2 (the first bracket 21 is unfolded), which is not conducive to the normal operation of the drilling rig 2.

[0068] The oil supply control method of the embodiment of the present invention includes:

[0069] The clamp cylinder 32 is used to drive the clamp body 31 to open and close. The propulsion force of the piston rod of the clamp cylinder 32 must overcome the resistance F of the clamp body 31. J , can work normally, that is, F J It is the minimum value for the clamp body 31 to work normally.

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

[0071]

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

[0073]

[0074] Among them, A JW A is the rodless cavity area of ​​the clamp cylinder 32, JY It is the rod cavity area of ​​the clamp cylinder 32.

[0075] If the area of ​​the rod chamber of the clamp cylinder 32 is smaller than the area of ​​the rodless chamber of the clamp cylinder 32, then P JB Greater than P JZ The minimum pressure for driving the clamp body 31 to operate normally is the minimum pressure P required to drive the clamp body 31 to close. JB , then the minimum pressure in the clamp oil pipe 23 is P JB .

[0076] The thrust force of the inner tube 231 of the clamp oil tube 23 extending outward is defined as F G , then the relationship is satisfied:

[0077]

[0078] Among them, A NGis the cross-sectional area of ​​the inner tube 231 of the clamp oil tube 23.

[0079] By adjusting the rod cavity area A of the clamp oil cylinder 32 JY and the cross-sectional area A of the inner tube 231 of the clamp oil tube 23 NG , adjust the thrust F of the inner tube 231 of the clamp oil pipe 23 extending outward during the operation of the clamp body 31 G .

[0080] Therefore, the oil supply control method of the embodiment of the present invention increases the rod cavity area A of the clamp oil cylinder 32. JY , reduce the cross-sectional area A of the inner tube 231 of the clamp oil tube 23 NG , thereby reducing the thrust of the inner tube 231 of the clamp oil pipe 23 extending outward during the operation of the clamp body 31, and further reducing the sudden change effect of the clamp oil pipe 23 on the primary stroke propulsion force of the drilling rig 2.

[0081] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0082] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0085] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0086] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A clamp oil supply system, characterized in that: include: A drilling rack, the drilling rack comprising a first bracket, a second bracket and two clamp oil pipes, the first bracket being slidable along its length direction, the second bracket being slidably mounted on the first bracket along its length direction, 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 to a bottom plate of the first bracket, a first oil supply channel being provided in the bottom plate of the first bracket, the top end of the outer pipe being connected to a top plate of the second bracket, a second oil supply channel being provided in the top plate of the second bracket; The clamp assembly includes a connected clamp body and a clamp cylinder, the clamp cylinder is installed on the top plate of the second bracket, the second oil supply channel is connected to the inner cavity of the clamp cylinder, and a hydraulically controlled one-way valve is installed in the channel through which the second oil supply channel supplies oil to the rod cavity of the clamp cylinder.

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 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 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 cylinder.

4. The clamp oil supply system according to claim 3, characterized in that: 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 passage to put the clamp body in a clamping state, and the hydraulically controlled one-way valve restricts the hydraulic oil in the rod chamber of the clamp oil cylinder from flowing back; Oil is supplied to the rodless chamber of the clamp cylinder through the second rodless chamber channel to put the clamp in a loosened state, and part of the hydraulic oil in the second rodless chamber 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.

5. The clamp oil supply system according to claim 4, characterized in that: The hydraulically controlled one-way valve has ports a, b and c. The hydraulic oil in the second rod chamber channel flows into from port b of the hydraulically controlled one-way valve and opens the hydraulically controlled one-way valve, so as 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 channel flows into from port c of the hydraulically controlled one-way valve and opens the hydraulically controlled one-way valve, so that the hydraulic oil in the rod chamber of the clamp cylinder flows back through ports a and b of the hydraulically controlled one-way valve in turn.

6. 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.

7. The clamp oil supply system according to claim 6, 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.

8. The clamp oil supply system according to claim 1, characterized in that: The clamp assembly further comprises a guard plate, wherein the guard plate is 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.

9. The clamp oil supply system according to claim 8, 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 parts are installed in the assembly holes.

10. 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 9, and the oil supply control method comprises: The minimum resistance of the piston rod of the clamp cylinder 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: Among them, A JW A is the rodless cavity area of ​​the clamp cylinder, 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 P JB , then the minimum pressure in the clamp oil pipe is P JB ; The thrust force that extends the inner tube of the clamp oil pipe outward is defined as F G , then the relationship is satisfied: Among them, A NG is the cross-sectional area of ​​the inner tube of the clamp oil pipe; By adjusting the rod cavity area A of the clamp cylinder JY And the cross-sectional area A of the inner tube of the clamp oil pipe NG , adjust the thrust F of the inner tube of the clamp oil pipe extending outward during the operation of the clamp body G .

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