A slip interlock control system for a live press machine

Abstract

This utility model belongs to the field of live-line working technology, and its purpose is to provide a slip interlock control system for a live-line working machine. The technical solution adopted is: a slip interlock control system for a live-line working machine, including a main pump, a first manual three-position four-way directional valve, a second manual three-position four-way directional valve, a first hydraulic cylinder, a first two-position three-way directional valve, a first load balancing valve, a second hydraulic cylinder, a second two-position three-way directional valve, a first shuttle valve, a pilot pump, a first two-position four-way solenoid valve, a manual two-position three-way directional valve, a first sensor, and a second sensor. This utility model can realize hydraulic and electromagnetic interlocking of the slip assembly, which can improve the safety and efficiency of live-line working.

Description

Technical Field

[0001] This utility model belongs to the field of live-line working technology, specifically relating to a slip interlock control system for a live-line working machine. Background Technology

[0002] During pressurized well workover operations, the raising or lowering of the tubing string requires the operation of four slips (moving load-bearing slips, fixed load-bearing slips, moving anti-overhead slips, and fixed anti-overhead slips) in different states via a control handle to ensure the tubing string is safely retrieved or lowered from the well. The slip group consisting of the moving and fixed load-bearing slips is used to prevent the tubing string from falling into the well, while the slip group consisting of the moving and fixed anti-overhead slips is used to prevent the tubing string from flying out of the well.

[0003] Because of the pressure at the bottom of the well, when the weight of the tubing is less than the upward thrust of the bottom pressure, the tubing may fly out of the wellhead; conversely, if the weight of the tubing is greater than the bottom pressure, it may fall into the well. Taking running tubing into the well as an example, when the weight of the tubing is less than the upward thrust of the bottom pressure, the fixed anti-overhead slips open, and the movable anti-overhead slips close to clamp the tubing. Under the downward pressure of the hoist, the tubing moves downward. When it reaches the appropriate position, the fixed anti-overhead slips close to clamp the tubing, and the movable anti-overhead slips open. The hoist moves upward with the movable anti-overhead slips, executing the next cycle. When the weight of the tubing is greater than the upward thrust of the bottom pressure, a load-bearing slip group is used to prevent the tubing from falling into the well when its weight exceeds the bottom thrust. Therefore, during pressurized operations, at least one slip in the same slip group must always effectively clamp the tubing.

[0004] In existing technologies, to ensure that the slips within the same slip group do not open simultaneously, a hydraulic system is primarily used to interlock and control the slips within the slip group, preventing safety accidents caused by uncontrolled tubing flow. However, in using existing technologies, the inventors have discovered at least the following problems:

[0005] Existing hydraulic systems cannot accurately detect whether the slip cylinders are fully open or closed, relying solely on the status of the control handle. If a slip is clamped at the coupling or not fully closed, but the hydraulic system still determines it is closed, the other slip may open incorrectly, causing the tubing string to fly out or fall under the pressure inside the well, resulting in a serious accident. Furthermore, existing hydraulic systems are limited in function and cannot monitor the actual status of the slips in real time, leading to insufficient safety and reliability in live-line operations. Utility Model Content

[0006] In order to at least partially solve the above-mentioned technical problems, this utility model provides a slip interlock control system for a live-line working machine.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A slip interlock control system for a live working machine includes a main pump, a first manual three-position four-way directional valve, a second manual three-position four-way directional valve, a first hydraulic cylinder, a first two-position three-way directional valve, a first load balancing valve, a second hydraulic cylinder, a second two-position three-way directional valve, a first shuttle valve, a pilot pump, a first two-position four-way solenoid valve, a manual two-position three-way directional valve, a first sensor, and a second sensor.

[0009] The oil outlet of the main pump is connected to the oil inlet of the first manual three-position four-way reversing valve and the oil inlet of the second manual three-position four-way reversing valve, respectively.

[0010] The first working port of the first manual three-position four-way directional valve is connected to the rodless chamber of the first cylinder and the inlet of the first two-position three-way directional valve, respectively. The working port of the first two-position three-way directional valve is connected to the first control port of the first load balance valve. The second working port of the first manual three-position four-way directional valve is connected to the rod chamber of the first cylinder and the inlet of the second two-position three-way directional valve, respectively. The working port of the second two-position three-way directional valve is connected to the first inlet of the first shuttle valve. The outlet of the first shuttle valve is connected to the second control port of the first load balance valve.

[0011] The first working port of the second manual three-position four-way directional valve is connected to the inlet port of the first load balance valve, the outlet port of the first load balance valve is connected to the rodless chamber of the second cylinder, and the second working port of the second manual three-position four-way directional valve is connected to the rod chamber of the second cylinder.

[0012] The oil outlet of the pilot pump is connected to the oil inlet of the first two-position four-way solenoid valve and the oil inlet of the manual two-position three-way directional valve, respectively. The first working oil port of the first two-position four-way solenoid valve is connected to the second oil inlet of the first shuttle valve. The second working oil port of the first two-position four-way solenoid valve is connected to the return oil port of the first two-position three-way directional valve. The working oil port of the manual two-position three-way directional valve is connected to the control oil port of the first two-position three-way directional valve and the control oil port of the second two-position three-way directional valve, respectively.

[0013] The first sensor is used to detect the working state of the first hydraulic cylinder, and the second sensor is used to detect the working state of the second hydraulic cylinder.

[0014] In one possible design, the system further includes a first oil tank, and the oil inlet of the main pump, the oil return port of the first manual three-position four-way directional valve, and the oil return port of the second manual three-position four-way directional valve are all connected to the first oil tank.

[0015] In one possible design, the system further includes a second oil tank, and the oil inlet of the pilot pump, the oil return port of the first two-position four-way solenoid valve, the oil return port of the second two-position three-way directional valve, and the oil return port of the manual two-position three-way directional valve are all connected to the second oil tank.

[0016] In one possible design, the system also includes a third two-position three-way directional valve, a second load balancing valve, a fourth two-position three-way directional valve, a second shuttle valve, and a second two-position four-way solenoid valve.

[0017] The first working port of the second manual three-position four-way directional valve is also connected to the inlet port of the third two-position three-way directional valve. The working port of the third two-position three-way directional valve is connected to the first control port of the second load balance valve. The inlet port of the second load balance valve is connected to the first working port of the first manual three-position four-way directional valve. The outlet port of the second load balance valve is connected to the rodless chamber of the first cylinder. The second working port of the second manual three-position four-way directional valve is also connected to the inlet port of the fourth two-position three-way directional valve. The working port of the fourth two-position three-way directional valve is connected to the first inlet port of the second shuttle valve. The outlet port of the second shuttle valve is connected to the second control port of the second load balance valve. The control ports of the third two-position three-way directional valve and the fourth two-position three-way directional valve are both connected to the working port of the manual two-position three-way directional valve.

[0018] The oil outlet of the pilot pump is also connected to the oil inlet of the second two-position four-way solenoid valve, the first working oil port of the second two-position four-way solenoid valve is connected to the second oil inlet of the second shuttle valve, and the second working oil port of the second two-position four-way solenoid valve is connected to the return oil port of the third two-position three-way directional valve.

[0019] In one possible design, the system further includes a second oil tank, and the return port of the fourth two-position three-way directional valve and the return port of the second two-position four-way solenoid valve are both connected to the second oil tank.

[0020] In one possible design, check valves are provided between the oil outlet of the main pump and the oil inlet of the first manual three-position four-way directional valve, and between the oil outlet of the main pump and the oil inlet of the second manual three-position four-way directional valve.

[0021] In one possible design, the first hydraulic cylinder is used to drive the floating load-bearing slip to open or close, and the second hydraulic cylinder is used to drive the fixed load-bearing slip to open or close.

[0022] In one possible design, the first hydraulic cylinder is used to drive the floating anti-top slip to open or close, and the second hydraulic cylinder is used to drive the fixed anti-top slip to open or close.

[0023] The beneficial effects of this utility model are mainly reflected in the fact that it can realize hydraulic interlocking and electromagnetic interlocking of the slip assembly, which can improve the safety and efficiency of live operation. Furthermore, by combining the first and second sensors to detect the switching status of the slip assembly, it can effectively avoid the problem of misoperation caused by the slips not being fully closed. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of one form of the slip interlock control system for the live-line working machine in the embodiment;

[0025] Figure 2 This is a schematic diagram of another form of the slip interlock control system for the live-line working machine in the embodiment. Detailed Implementation

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the present utility model will be briefly introduced below in conjunction with the accompanying drawings and descriptions of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the description of these embodiments is used to help understand this utility model, but does not constitute a limitation on this utility model.

[0027] It should be understood that although the terms first, second, etc., may be used herein to describe various units, these units should not be limited by these terms. These terms are only used to distinguish one unit from another. For example, the first unit may be referred to as the second unit, and similarly, the second unit may be referred to as the first unit, without departing from the scope of the exemplary embodiments of this utility model.

[0028] Example 1:

[0029] like Figure 1 As shown, this embodiment provides a slip interlock control system for a live-line working machine, including a main pump 16, a first manual three-position four-way directional valve 2, a second manual three-position four-way directional valve 1, a first hydraulic cylinder 15, a first two-position three-way directional valve 8, a first load balancing valve 6, a second hydraulic cylinder 14, a second two-position three-way directional valve 7, a first shuttle valve 5, a pilot pump 17, a first two-position four-way solenoid valve 3, a manual two-position three-way directional valve 13, a first sensor, and a second sensor; wherein, the first hydraulic cylinder 15 and the second hydraulic cylinder 14 are used to control two slips in the slip group, such as the first hydraulic cylinder 15 being used to drive the floating load-bearing slip to open or close, and the second hydraulic cylinder 14 being used to drive the fixed load-bearing slip to open or close; or, the first hydraulic cylinder 15 being used to drive the floating anti-overhead slip to open or close, and the second hydraulic cylinder 14 being used to drive the fixed anti-overhead slip to open or close.

[0030] The oil outlet of the main pump 16 is connected to the oil inlet of the first manual three-position four-way reversing valve 2 and the oil inlet of the second manual three-position four-way reversing valve 1, respectively; it should be noted that the main pump 16 is used to output the main oil supply.

[0031] The first working port of the first manual three-position four-way directional valve 2 is connected to the rodless chamber of the first cylinder 15 and the inlet port of the first two-position three-way directional valve 8, respectively. The working port of the first two-position three-way directional valve 8 is connected to the first control port of the first load balance valve 6. The second working port of the first manual three-position four-way directional valve 2 is connected to the rod chamber of the first cylinder 15 and the inlet port of the second two-position three-way directional valve 7, respectively. The working port of the second two-position three-way directional valve 7 is connected to the first inlet port of the first shuttle valve 5. The outlet port of the first shuttle valve is connected to the second control port of the first load balance valve 6.

[0032] The first working port of the second manual three-position four-way reversing valve 1 is connected to the inlet port of the first load balance valve 6, the outlet port of the first load balance valve 6 is connected to the rodless chamber of the second cylinder 14, and the second working port of the second manual three-position four-way reversing valve 1 is connected to the rod chamber of the second cylinder 14.

[0033] The oil outlet of the pilot pump 17 is connected to the oil inlet of the first two-position four-way solenoid valve 3 and the oil inlet of the manual two-position three-way directional valve 13, respectively. The first working oil port of the first two-position four-way solenoid valve 3 is connected to the second oil inlet of the first shuttle valve 5. The second working oil port of the first two-position four-way solenoid valve 3 is connected to the return oil port of the first two-position three-way directional valve 8. The working oil port of the manual two-position three-way directional valve 13 is connected to the control oil port of the first two-position three-way directional valve 8 and the control oil port of the second two-position three-way directional valve 7, respectively. It should be noted that the pilot pump 17 is used to output pilot control oil.

[0034] The first sensor is used to detect the working state of the first hydraulic cylinder 15, and the second sensor is used to detect the working state of the second hydraulic cylinder 14.

[0035] This embodiment can realize hydraulic and electromagnetic interlocking of the slip assembly, which can improve the safety and efficiency of live operation. By combining the first and second sensors to detect the opening and closing status of the slip assembly, it can effectively avoid the problem of misoperation caused by the slips not being fully closed.

[0036] Furthermore, in this embodiment, the second two-position three-way directional valve 7, the first shuttle valve 5, and the first load balance valve 6 constitute a hydraulic interlock circuit, and the first two-position four-way solenoid valve 3, the first shuttle valve 5, and the first load balance valve 6 constitute an electromagnetic interlock circuit. The two share the first shuttle valve 5 and the first load balance valve 6, thereby integrating the electromagnetic interlock and the hydraulic interlock into the same valve block, which can reduce the number of valve components, save installation space, and reduce the cost of use and maintenance.

[0037] In this embodiment, the system further includes a first oil tank 18, and the oil inlet of the main pump 16, the oil return port of the first manual three-position four-way reversing valve 2 and the oil return port of the second manual three-position four-way reversing valve 1 are all connected to the first oil tank 18.

[0038] In this embodiment, the system further includes a second oil tank 19, and the oil inlet of the pilot pump 17, the oil return port of the first two-position four-way solenoid valve 3, the oil return port of the second two-position three-way reversing valve 7, and the oil return port of the manual two-position three-way reversing valve 13 are all connected to the second oil tank 19.

[0039] In this embodiment, the system further includes a third two-position three-way directional valve 12, a second load balancing valve 10, a fourth two-position three-way directional valve 11, a second shuttle valve 9, and a second two-position four-way solenoid valve 4.

[0040] The first working port of the second manual three-position four-way directional valve 1 is also connected to the inlet port of the third two-position three-way directional valve 12. The working port of the third two-position three-way directional valve 12 is connected to the first control port of the second load balance valve 10. The inlet port of the second load balance valve 10 is connected to the first working port of the first manual three-position four-way directional valve 2. The outlet port of the second load balance valve 10 is connected to the rodless chamber of the first cylinder 15. The second working port of the second manual three-position four-way directional valve 1 is also connected to the inlet port of the fourth two-position three-way directional valve 11. The working port of the fourth two-position three-way directional valve 11 is connected to the first inlet port of the second shuttle valve 9. The outlet port of the second shuttle valve 9 is connected to the second control port of the second load balance valve 10. The control ports of the third two-position three-way directional valve 12 and the fourth two-position three-way directional valve 11 are both connected to the working port of the manual two-position three-way directional valve 13.

[0041] The oil outlet of the pilot pump 17 is also connected to the oil inlet of the second two-position four-way solenoid valve 4. The first working oil port of the second two-position four-way solenoid valve 4 is connected to the second oil inlet of the second shuttle valve 9. The second working oil port of the second two-position four-way solenoid valve 4 is connected to the return oil port of the third two-position three-way directional valve 12.

[0042] In this embodiment, the system further includes a second oil tank 19, and the oil return port of the fourth two-position three-way reversing valve 11 and the oil return port of the second two-position four-way solenoid valve 4 are both connected to the second oil tank 19.

[0043] In this embodiment, check valves 20 are provided between the oil outlet of the main pump 16 and the oil inlet of the first manual three-position four-way reversing valve 2, and between the oil outlet of the main pump 16 and the oil inlet of the second manual three-position four-way reversing valve 1. The check valves 20 prevent backflow of oil output from the main pump 16, thus protecting the stable operation of the main pump 16.

[0044] During implementation, hydraulic and electromagnetic interlock functions can be used in combination, individually, or without either function. When operating under pressure, both interlock functions are activated simultaneously. If one fails, the other effectively controls the opening and closing of the slips, preventing accidents. When the slips need to be opened simultaneously during equipment maintenance or when the equipment is not in operation, the interlock function should not be used. In this case, the interlock function should be disabled and can be deactivated via a control handle or switch. The working principle of this embodiment under the four application scenarios is as follows:

[0045] 1. When the manual two-position three-way directional valve 13 is in the left position, the hydraulic interlock function is activated, and the electromagnetic interlock function is activated.

[0046] 1.1 When the first manual three-position four-way directional valve 2 is moved to the right, the main oil output from the main pump 16 enters the rodless chamber of the first cylinder 15 through the first manual three-position four-way directional valve 2 and the second load balance valve 10. At this time, the control slip of the first cylinder 15 is closed. Another control oil circuit pushes the first load balance valve 6 to the right from the first manual three-position four-way directional valve 2 through the first two-position three-way directional valve 8.

[0047] At this time, the second manual three-position four-way directional valve 1 is moved to the right or left, and oil enters the rodless chamber or rod chamber of the second cylinder 14. The second cylinder 14 controls the slips to open or close normally.

[0048] 1.2. When the first manual three-position four-way directional valve 2 is moved to the left, the main oil output from the main pump 16 enters the rod chamber of the first cylinder 15 through the first manual three-position four-way directional valve 2, and the first cylinder 15 controls the opening of the slip. Another control oil circuit from the first manual three-position four-way directional valve 2 through the second two-position three-way directional valve 7 and the first shuttle valve 5 pushes the first load balance valve 6 to the left. When the first sensor detects that the first cylinder 15 controls the opening of the slip, the first two-position four-way solenoid valve 3 is energized, and the valve core moves to the left. The pilot control oil output from the pilot pump 17 enters the first shuttle valve 5 through the first two-position four-way solenoid valve 3, pushing the first load balance valve 6 to the left.

[0049] At this time, the second manual three-position four-way directional valve 1 is moved to the right, oil enters the rodless chamber of the second cylinder 14, and the control slip of the second cylinder 14 can be closed normally.

[0050] When the second manual three-position four-way directional valve 1 is moved to the left, oil enters the rod chamber of the second cylinder 14. However, since the first load balance valve 6 in its right position only allows unidirectional oil flow, the control slip of the second cylinder 14 cannot be opened.

[0051] The dual-path control oil provides redundant design and double protection. When the hydraulic interlock circuit of the second two-position three-way directional valve 7 fails, the oil circuit of the first two-position four-way solenoid valve 3 continues to push the first load balance valve 6 to the left, preventing the control slip of the second cylinder 14 from opening.

[0052] 1.3 Similarly, when the second manual three-position four-way directional valve 1 moves to the right, the main oil output from the main pump 16 enters the rodless chamber of the second cylinder 14 through the second manual three-position four-way directional valve 1 and the first load balance valve 6. At this time, the control slip of the second cylinder 14 closes. Another control oil circuit pushes the second load balance valve 10 to the right through the third two-position three-way directional valve 12 from the second manual three-position four-way directional valve 1.

[0053] At this time, the first manual three-position four-way directional valve 2 is moved to the right or left, and oil enters the rodless chamber or rod chamber of the first oil cylinder 15. The first oil cylinder 15 controls the slip to open or close normally.

[0054] 1.4 When the second manual three-position four-way directional valve 1 moves to the left, the main oil output from the main pump 16 enters the rod chamber of the second cylinder 14 through the second manual three-position four-way directional valve 1, and the second cylinder 14 controls the slip to open. Another control oil circuit from the second manual three-position four-way directional valve 1 through the fourth two-position three-way directional valve 11 and the second shuttle valve 9 pushes the second load balance valve 10 to move to the left. The second sensor detects that the second cylinder 14 controls the slip to open, the second two-position four-way solenoid valve 4 is energized, the valve core moves to the left, and the pilot control oil output from the pilot pump 17 enters the second shuttle valve 9 through the second two-position four-way solenoid valve 4, pushing the second load balance valve 10 to move to the left.

[0055] At this time, the first manual three-position four-way directional valve 2 is moved to the right, oil enters the rodless chamber of the first oil cylinder 15, and the control slip of the first oil cylinder 15 can be closed normally.

[0056] When the first manual three-position four-way directional valve 2 is moved to the left, oil enters the rod chamber of the first cylinder 15. However, because the second load balance valve 10 only allows unidirectional oil flow in its right position, the control slip of the first cylinder 15 cannot open.

[0057] When the hydraulic interlock circuit of the fourth two-position three-way directional valve 11 fails, the oil circuit of the second two-position four-way solenoid valve 4 continues to push the second load balance valve 10 to the left, and the first cylinder 15 controls the slip to not open.

[0058] 2. When the manual two-position three-way directional valve 13 is in the right position, the hydraulic interlock function is activated and the electromagnetic interlock function is deactivated.

[0059] 2.1 When the first manual three-position four-way directional valve 2 moves to the right, the main oil output from the main pump 16 enters the rodless chamber of the first cylinder 15 through the first manual three-position four-way directional valve 2 and the second load balance valve 10. At this time, the control slip of the first cylinder 15 closes. Another control oil circuit pushes the first load balance valve 6 to the right from the first manual three-position four-way directional valve 2 through the first two-position three-way directional valve 8.

[0060] At this time, the second manual three-position four-way directional valve 1 is moved to the right or left, and oil enters the rodless chamber or rod chamber of the second cylinder 14. The second cylinder 14 controls the slips to open or close normally.

[0061] 2.2 When the first manual three-position four-way directional valve 2 moves to the left, the main oil output from the main pump 16 enters the rod chamber of the first cylinder 15 through the first manual three-position four-way directional valve 2, and the first cylinder 15 controls the slips to open. Another control oil circuit from the first manual three-position four-way directional valve 2 through the second two-position three-way directional valve 7 and the first shuttle valve 5 pushes the first load balance valve 6 to move to the left.

[0062] At this time, the second manual three-position four-way directional valve 1 is moved to the right, oil enters the rodless chamber of the second cylinder 14, and the control slip of the second cylinder 14 can be closed normally.

[0063] When the second manual three-position four-way directional valve 1 is moved to the left, oil enters the rod chamber of the second cylinder 14. However, since the first load balance valve 6 in its right position only allows unidirectional oil flow, the control slip of the second cylinder 14 cannot be opened.

[0064] 2.3 Similarly, when the second manual three-position four-way directional valve 1 is moved to the right, the main oil output from the main pump 16 enters the rodless chamber of the second cylinder 14 through the second manual three-position four-way directional valve 1 and the first load balance valve 6. At this time, the control slip of the second cylinder 14 is closed. Another control oil circuit pushes the second load balance valve 10 to the right through the third two-position three-way directional valve 12 from the second manual three-position four-way directional valve 1.

[0065] At this time, the first manual three-position four-way directional valve 2 is moved to the right or left, and oil enters the rodless chamber or rod chamber of the first oil cylinder 15. The first oil cylinder 15 controls the slip to open or close normally.

[0066] 2.4 When the second manual three-position four-way directional valve 1 moves to the left, the main oil output from the main pump 16 enters the rod chamber of the second cylinder 14 through the second manual three-position four-way directional valve 1, and the second cylinder 14 controls the slips to open. Another control oil circuit from the second manual three-position four-way directional valve 1 through the fourth two-position three-way directional valve 11 and the second shuttle valve 9 pushes the second load balance valve 10 to move to the left.

[0067] At this time, the first manual three-position four-way directional valve 2 is moved to the right, oil enters the rodless chamber of the first oil cylinder 15, and the control slip of the first oil cylinder 15 can be closed normally.

[0068] When the first manual three-position four-way directional valve 2 is moved to the left, oil enters the rod chamber of the first cylinder 15. However, because the second load balance valve 10 only allows unidirectional oil flow in its right position, the control slip of the first cylinder 15 cannot open.

[0069] 3. When the manual two-position three-way directional valve 13 is in the left position, the hydraulic interlock function is off and the electromagnetic interlock function is on.

[0070] The pilot control oil output from pilot pump 17 pushes the second two-position three-way directional valve 7, the first two-position three-way directional valve 8, the fourth two-position three-way directional valve 11, and the third two-position three-way directional valve 12 downwards via manual two-position three-way directional valve 13. One pilot oil pushes the second load balance valve 10 to the right via the second two-position four-way solenoid valve 4 and the third two-position three-way directional valve 12. The other pilot oil pushes the first load balance valve 6 to the right via the first two-position four-way solenoid valve 3 and the first two-position three-way directional valve 8.

[0071] 3.1 When the first manual three-position four-way directional valve 2 is moved to the right, the main oil output from the main pump 16 enters the rodless chamber of the first cylinder 15 through the first manual three-position four-way directional valve 2 and the second load balance valve 10. The first cylinder 15 then controls the slips to close. Another control oil circuit terminates from the first manual three-position four-way directional valve 2 through the first two-position three-way directional valve 8.

[0072] At this time, the second manual three-position four-way directional valve 1 is moved to the right or left, and oil enters the rodless chamber or rod chamber of the second cylinder 14. The second cylinder 14 controls the slips to open or close normally.

[0073] 3.2. The first manual three-position four-way directional valve 2 is moved to the left. The main oil output from the main pump 16 enters the rod chamber of the first cylinder 15 through the first manual three-position four-way directional valve 2, and the first cylinder 15 controls the opening of the slips. Another control oil circuit terminates from the first manual three-position four-way directional valve 2 through the second two-position three-way directional valve 7. The first sensor detects that the first cylinder 15 controls the opening of the slips. The first two-position four-way solenoid valve 3 is energized, and pilot oil passes through the first two-position four-way solenoid valve 3 and the first shuttle valve 5, pushing the first load balance valve 6 to the left.

[0074] At this time, the second manual three-position four-way directional valve 1 is moved to the right, oil enters the rodless chamber of the second cylinder 14, and the control slip of the second cylinder 14 can be closed normally.

[0075] When the second manual three-position four-way directional valve 1 is moved to the left, oil enters the rod chamber of the second cylinder 14. However, since the first load balance valve 6 in its right position only allows unidirectional oil flow, the control slip of the second cylinder 14 cannot be opened.

[0076] 3.3. When the second manual three-position four-way directional valve 1 is moved to the right, the main oil output from the main pump 16 enters the rodless chamber of the second cylinder 14 through the second manual three-position four-way directional valve 1 and the first load balance valve 6. The second cylinder 14 then controls the slips to close. Another control oil circuit terminates from the second manual three-position four-way directional valve 1 through the third two-position three-way directional valve 12.

[0077] At this time, the first manual three-position four-way directional valve 2 is moved to the right or left, and oil enters the rodless chamber or rod chamber of the first oil cylinder 15. The first oil cylinder 15 controls the slip to open or close normally.

[0078] 3.4. The second manual three-position four-way directional valve 1 is moved to the left. The main oil output from the main pump 16 enters the rod chamber of the second cylinder 14 through the second manual three-position four-way directional valve 1, and the second cylinder 14 controls the slips to open. Another control oil circuit terminates from the second manual three-position four-way directional valve 1 through the fourth two-position three-way directional valve 11. The second sensor detects that the second cylinder 14 controls the slips to open. The second two-position four-way solenoid valve 4 is energized, and pilot oil pushes the second load balance valve 10 to the left through the second two-position four-way solenoid valve 4 and the second shuttle valve 9.

[0079] At this time, the first manual three-position four-way directional valve 2 is moved to the right, oil enters the rodless chamber of the first oil cylinder 15, and the control slip of the first oil cylinder 15 can be closed normally.

[0080] When the first manual three-position four-way directional valve 2 is moved to the left, oil enters the rod chamber of the first cylinder 15. However, because the second load balance valve 10 only allows unidirectional oil flow in its right position, the control slip of the first cylinder 15 cannot open.

[0081] IV. When the manual two-position three-way directional valve 13 is in the left position, the hydraulic interlock function is off and the electromagnetic interlock function is off.

[0082] The pilot control oil output from pilot pump 17 pushes the second two-position three-way directional valve 7, the first two-position three-way directional valve 8, the fourth two-position three-way directional valve 11, and the third two-position three-way directional valve 12 downwards via manual two-position three-way directional valve 13. One pilot oil pushes the second load balance valve 10 to the right via the second two-position four-way solenoid valve 4 and the third two-position three-way directional valve 12. The other pilot oil pushes the first load balance valve 6 to the right via the first two-position four-way solenoid valve 3 and the first two-position three-way directional valve 8.

[0083] 4.1 When the first manual three-position four-way directional valve 2 is moved to the right, the main oil output from the main pump 16 enters the rodless chamber of the first cylinder 15 through the first manual three-position four-way directional valve 2 and the second load balance valve 10. The first cylinder 15 then controls the slips to close. Another control oil circuit terminates from the first manual three-position four-way directional valve 2 through the first two-position three-way directional valve 8.

[0084] At this time, the second manual three-position four-way directional valve 1 is moved to the right or left, and oil enters the rodless chamber or rod chamber of the second cylinder 14. The second cylinder 14 controls the slips to open or close normally.

[0085] 4.2. When the first manual three-position four-way directional valve 2 is moved to the left, the main oil output from the main pump 16 enters the rod chamber of the first cylinder 15 through the first manual three-position four-way directional valve 2, and the first cylinder 15 controls the slips to open. The other control oil circuit terminates from the first manual three-position four-way directional valve 2 through the second two-position three-way directional valve 7.

[0086] At this time, the second manual three-position four-way directional valve 1 is moved to the right or left, and oil enters the rodless chamber or rod chamber of the second cylinder 14. The second cylinder 14 controls the slips to open or close normally.

[0087] 4.3. When the second manual three-position four-way directional valve 1 is moved to the right, the main oil output from the main pump 16 enters the rodless chamber of the second cylinder 14 through the second manual three-position four-way directional valve 1 and the first load balance valve 6. The second cylinder 14 then controls the slips to close. Another control oil circuit terminates from the second manual three-position four-way directional valve 1 through the third two-position three-way directional valve 12.

[0088] At this time, the first manual three-position four-way directional valve 2 is moved to the right or left, and oil enters the rodless chamber or rod chamber of the first oil cylinder 15. The first oil cylinder 15 controls the slip to open or close normally.

[0089] 4.4. When the second manual three-position four-way directional valve 1 is moved to the left, the main oil output from the main pump 16 enters the rod chamber of the second cylinder 14 through the second manual three-position four-way directional valve 1, and the second cylinder 14 controls the slips to open. Another control oil circuit terminates from the second manual three-position four-way directional valve 1 through the fourth two-position three-way directional valve 11.

[0090] At this time, the first manual three-position four-way directional valve 2 is moved to the right or left, and oil enters the rodless chamber or rod chamber of the first oil cylinder 15. The first oil cylinder 15 controls the slip to open or close normally.

[0091] Furthermore, in this embodiment, to achieve status control of the four slips (moving load-bearing slip, fixed load-bearing slip, moving anti-overhead slip, and fixed anti-overhead slip), in this embodiment, as follows: Figure 2 As shown, two sets of slip interlock control systems, A and B, can be set up, and the two sets of slip interlock control systems share the main pump 16 and the pilot pump 17. Correspondingly, if the two cylinders in one slip interlock control system drive the floating load-bearing slip and the fixed load-bearing slip to open or close respectively, then the two cylinders in the other slip interlock control system drive the floating anti-top slip and the fixed anti-top slip to open or close respectively.

[0092] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A slip interlock control system for a press-on work machine, characterized by: Includes a main pump, a first manual three-position four-way directional valve, a second manual three-position four-way directional valve, a first hydraulic cylinder, a first two-position three-way directional valve, a first load balancing valve, a second hydraulic cylinder, a second two-position three-way directional valve, a first shuttle valve, a pilot pump, a first two-position four-way solenoid valve, a manual two-position three-way directional valve, a first sensor, and a second sensor; The oil outlet of the main pump is connected to the oil inlet of the first manual three-position four-way reversing valve and the oil inlet of the second manual three-position four-way reversing valve, respectively. The first working port of the first manual three-position four-way directional valve is connected to the rodless chamber of the first cylinder and the inlet of the first two-position three-way directional valve, respectively. The working port of the first two-position three-way directional valve is connected to the first control port of the first load balance valve. The second working port of the first manual three-position four-way directional valve is connected to the rod chamber of the first cylinder and the inlet of the second two-position three-way directional valve, respectively. The working port of the second two-position three-way directional valve is connected to the first inlet of the first shuttle valve. The outlet of the first shuttle valve is connected to the second control port of the first load balance valve. The first working port of the second manual three-position four-way directional valve is connected to the inlet port of the first load balance valve, the outlet port of the first load balance valve is connected to the rodless chamber of the second cylinder, and the second working port of the second manual three-position four-way directional valve is connected to the rod chamber of the second cylinder. The oil outlet of the pilot pump is connected to the oil inlet of the first two-position four-way solenoid valve and the oil inlet of the manual two-position three-way directional valve, respectively. The first working oil port of the first two-position four-way solenoid valve is connected to the second oil inlet of the first shuttle valve. The second working oil port of the first two-position four-way solenoid valve is connected to the return oil port of the first two-position three-way directional valve. The working oil port of the manual two-position three-way directional valve is connected to the control oil port of the first two-position three-way directional valve and the control oil port of the second two-position three-way directional valve, respectively. The first sensor is used to detect the working state of the first hydraulic cylinder, and the second sensor is used to detect the working state of the second hydraulic cylinder.

2. The slip interlock control system for a live-line working machine according to claim 1, characterized in that: The system also includes a first oil tank, and the oil inlet of the main pump, the oil return port of the first manual three-position four-way reversing valve, and the oil return port of the second manual three-position four-way reversing valve are all connected to the first oil tank.

3. The slip interlock control system for a live-line working machine according to claim 1, characterized in that: The system also includes a second oil tank, and the oil inlet of the pilot pump, the oil return port of the first two-position four-way solenoid valve, the oil return port of the second two-position three-way directional valve, and the oil return port of the manual two-position three-way directional valve are all connected to the second oil tank.

4. The slip interlock control system for a live-line working machine according to claim 1, characterized in that: The system also includes a third two-position three-way directional valve, a second load balancing valve, a fourth two-position three-way directional valve, a second shuttle valve, and a second two-position four-way solenoid valve. The first working port of the second manual three-position four-way directional valve is also connected to the inlet port of the third two-position three-way directional valve. The working port of the third two-position three-way directional valve is connected to the first control port of the second load balance valve. The inlet port of the second load balance valve is connected to the first working port of the first manual three-position four-way directional valve. The outlet port of the second load balance valve is connected to the rodless chamber of the first cylinder. The second working port of the second manual three-position four-way directional valve is also connected to the inlet port of the fourth two-position three-way directional valve. The working port of the fourth two-position three-way directional valve is connected to the first inlet port of the second shuttle valve. The outlet port of the second shuttle valve is connected to the second control port of the second load balance valve. The control ports of the third two-position three-way directional valve and the fourth two-position three-way directional valve are both connected to the working port of the manual two-position three-way directional valve. The oil outlet of the pilot pump is also connected to the oil inlet of the second two-position four-way solenoid valve, the first working oil port of the second two-position four-way solenoid valve is connected to the second oil inlet of the second shuttle valve, and the second working oil port of the second two-position four-way solenoid valve is connected to the return oil port of the third two-position three-way directional valve.

5. The slip interlock control system for a live-line working machine according to claim 4, characterized in that: The system also includes a second oil tank, and the return port of the fourth two-position three-way reversing valve and the return port of the second two-position four-way solenoid valve are both connected to the second oil tank.

6. The slip interlock control system for a live-line working machine according to claim 1, characterized in that: Check valves are provided between the oil outlet of the main pump and the oil inlet of the first manual three-position four-way reversing valve, and between the oil outlet of the main pump and the oil inlet of the second manual three-position four-way reversing valve.

7. The slip interlock control system for a live-line working machine according to claim 1, characterized in that: The first hydraulic cylinder is used to drive the floating load-bearing slip to open or close, and the second hydraulic cylinder is used to drive the fixed load-bearing slip to open or close.

8. The slip interlock control system for a live-line working machine according to claim 1, characterized in that: The first hydraulic cylinder is used to drive the floating anti-top slip to open or close, and the second hydraulic cylinder is used to drive the fixed anti-top slip to open or close.

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