A multi-way reversing valve group for outrigger extension and protection

Abstract

The present invention discloses a multi-way reversing valve group for leg extension and protection, including an oil-through reversing valve plate and a plurality of leg control valve plates, wherein the plurality of leg control valve plates are arranged in parallel with each other, the oil-through reversing valve plate is connected in series with the plurality of leg control valve plates arranged in parallel, the oil-through reversing valve plate is provided with a reversing valve stem, and each leg control valve plate is provided with a control valve stem, wherein the control valve stem has a horizontal leg action position, an intermediate position, and a vertical leg action position, the reversing valve stem has an actuator extension position, an intermediate position, and an actuator retraction position, and the reversing valve stem and the control valve stem are operated in sequence to make the legs perform corresponding actions. The present invention can prevent the phenomenon that the legs are retracted due to the misoperation of the control valve stem on the leg control valve plate or the misoperation of the reversing valve stem on the oil-through reversing valve plate during operation, eliminates safety hazards, and provides a guarantee for safe operation.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic component manufacturing, and in particular to a multi-way reversing valve group for outrigger extension and protection, which is mainly used for outrigger extension and protection on engineering machinery such as vehicle cranes and cranes. Background Art

[0002] Multi-way reversing valves are widely used in the hydraulic systems of construction machinery such as cranes and cranes, and are often used to control the extension and retraction of horizontal and vertical outriggers on these construction machinery. Before these construction machinery are operated, the horizontal outriggers must be spread out first, and then the vertical outriggers must be lowered to stably support these mechanical equipment. The stability of these outriggers directly determines the safety during operation.

[0003] The multi-way reversing valve currently used to control these legs has multiple sub-valves, each of which is provided with an oil port connected to the oil chamber of the actuator that drives the legs to move, and each sub-valve is also provided with a valve stem for switching the oil circuit.

[0004] However, the existing multi-way reversing valve does not have a protection function. During operation, it is easy for the legs to retract due to misoperation of the valve stem on the sub-valve. This will cause these mechanical equipment to tilt and then cause safety accidents. Therefore, such safety hazards need to be eliminated. Summary of the invention

[0005] The purpose of the present invention is to provide a multi-way reversing valve group for outrigger extension and protection, so as to solve the problem of outrigger retraction due to erroneous operation and improve the safety during operation.

[0006] To this end, the present invention adopts the following technical solutions:

[0007] A multi-way reversing valve group for leg extension and protection, which is provided with an oil inlet P, a pressure output port P1, and an oil return port T, comprising: a plurality of leg control valve plates, each of which is provided with a first oil circuit for correspondingly connecting to a rodless chamber of a horizontal leg driving actuator, a second oil circuit for correspondingly connecting to a rodless chamber of a vertical leg driving actuator, a middle oil channel, and a control valve stem for switching the oil circuit, wherein the control valve stem has a horizontal leg action position connected to the first oil circuit, a vertical leg action position connected to the second oil circuit, and an intermediate position in which both the first oil circuit and the second oil circuit are blocked; and an oil-passing reversing valve plate, on which is provided a third oil circuit for supplying oil to the rod chambers of all horizontal leg driving actuators and the rod chambers of all vertical leg driving actuators, a fourth oil circuit for returning oil to the rod chambers of all horizontal leg driving actuators and the rod chambers of all vertical leg driving actuators, and a control valve stem for switching the oil circuit. The first oil circuit and the second oil circuit on the valve plate provide oil to the fifth oil circuit, the sixth oil circuit connected to the first oil circuit and the second oil circuit on all the leg control valve plates and used for returning oil to the rodless chambers of all horizontal leg driving actuators and the rodless chambers of all vertical leg driving actuators, the middle oil channel, and a reversing valve stem, wherein the reversing valve stem has an actuator extension position in which the fifth oil circuit and the fourth oil circuit are connected, an actuator retracted position in which the third oil circuit and the sixth oil circuit are connected, and an intermediate position in which the third oil circuit, the fourth oil circuit, the fifth oil circuit, and the sixth oil circuit are all blocked, wherein when the reversing valve stem is in the intermediate position, the oil-passing reversing valve plate and the middle oil channels on multiple leg control valve plates constitute a middle oil circuit to connect the oil inlet P and the pressure output port P1; when the reversing valve stem is in the actuator extension position, the fourth oil circuit returns oil and the fifth oil circuit takes in oil; when the reversing valve stem is in the actuator retracted position, the sixth oil circuit returns oil and the third oil circuit takes in oil.

[0008] Furthermore, the outrigger control valve plates are provided with four, and the first oil circuit of each outrigger control valve plate has an A oil port for correspondingly connecting to a rodless chamber oil port of a horizontal outrigger driving actuator, and the second oil circuit of each outrigger control valve plate has a B oil port for correspondingly connecting to a rodless chamber oil port of a vertical outrigger driving actuator, and the oil-passing reversing valve plate has a C oil port for connecting to the rod chamber oil ports of all horizontal outrigger driving actuators and the rod chamber oil ports of all vertical outrigger driving actuators.

[0009] Furthermore, the four leg control valve plates are composed of a first leg control valve plate, a second leg control valve plate, a third leg control valve plate, and a fourth leg control valve plate arranged in parallel in sequence, the oil-passing reversing valve plate is arranged between the second leg control valve plate and the third leg control valve plate, a first bridge valve plate is arranged between the oil-passing reversing valve plate and the second leg control valve plate, a second bridge valve plate is arranged between the oil-passing reversing valve plate and the third leg control valve plate, and a mid-position oil channel is provided in the first bridge valve plate and the second bridge valve plate, wherein the first bridge valve plate is used to realize the oil circuit connection between the oil-passing reversing valve plate and the second leg control valve plate, and is also used to realize the connection between the oil inlet P and the fifth oil circuit and the third oil circuit, and the second bridge valve plate is used to realize the oil circuit connection between the oil-passing reversing valve plate and the third leg control valve plate.

[0010] Further, the first bridge valve plate is provided with a first oil passage for connecting the third oil passage and the fifth oil passage, which is communicated with the middle oil passage of the first bridge valve plate, and a second oil passage and a third oil passage which are communicated with each other; the second bridge valve plate is provided with a fourth oil passage and a fifth oil passage which are communicated with each other; each of the outrigger control valve plates is provided with a sixth oil passage, a seventh oil passage which is communicated with the B oil port, and an eighth oil passage which is communicated with the A oil port, wherein the sixth oil passage and the seventh oil passage form a second oil passage, and the sixth oil passage and the eighth oil passage form a first oil passage; when the control valve stem is in the horizontal outrigger action position, the sixth oil passage is communicated with the eighth oil passage, and the sixth oil passage is communicated with the seventh oil passage. The oil channel is blocked, when the control valve rod is in the vertical leg action position, the sixth oil channel is connected with the seventh oil channel, and the sixth oil channel and the eighth oil channel are blocked, when the control valve rod is in the middle position, the sixth oil channel is blocked from the seventh oil channel and the eighth oil channel, wherein the sixth oil channel in the first leg control valve plate, the sixth oil channel in the second leg control valve plate, and the third oil channel are connected, the sixth oil channel in the third leg control valve plate, the sixth oil channel in the fourth leg control valve plate, and the fifth oil channel are connected, the second oil channel is used to connect the fifth oil channel and the sixth oil channel, and the fourth oil channel is used to connect the fifth oil channel and the sixth oil channel.

[0011] Further, the oil-through reversing valve plate is provided with a ninth oil passage communicating with the first oil passage, a tenth oil passage communicating with the C oil port, an eleventh oil passage for communicating with the second oil passage and the fourth oil passage, a twelfth oil passage communicating with the eleventh oil passage, and an oil return passage, wherein the ninth oil passage and the tenth oil passage form a third oil passage, the tenth oil passage and the oil return passage form a fourth oil passage, the ninth oil passage, the twelfth oil passage, and the eleventh oil passage form a fifth oil passage, the eleventh oil passage, the twelfth oil passage, and the oil return passage form a sixth oil passage, wherein when the reversing valve stem is in When the actuator is in the extended position, the ninth oil channel is connected with the twelfth oil channel, the tenth oil channel is connected with the return oil channel, the ninth oil channel and the tenth oil channel are blocked, and the twelfth oil channel and the return oil channel are blocked; when the reversing valve stem is in the retracted position of the actuator, the ninth oil channel is connected with the tenth oil channel, the twelfth oil channel is connected with the return oil channel, the ninth oil channel and the twelfth oil channel are blocked, and the tenth oil channel and the return oil channel are blocked; when the reversing valve stem is in the middle position, the ninth oil channel is blocked from the tenth oil channel and the twelfth oil channel, and the return oil channel is blocked from the tenth oil channel and the twelfth oil channel.

[0012] Furthermore, the oil-passing reversing valve plate, the four leg control valve plates, the first bridge valve plate, and the second bridge valve plate are all provided with oil return holes for returning oil, wherein the oil return holes in the oil-passing reversing valve plate are connected to the oil return channel, all the oil return holes are connected to form an oil return channel, and the oil return port T is connected to the oil return channel.

[0013] Furthermore, the multi-way reversing valve group further comprises a pressure protection unit connected to the oil inlet P and used for protecting the valve plate and the actuator.

[0014] Further, the pressure protection unit is a safety valve, the oil inlet of the safety valve is communicated with the oil inlet P, and the oil outlet of the safety valve is communicated with the oil return port T.

[0015] Furthermore, the control valve stem is provided with a first positioning steel ball, a first positioning column, and a first elastic resetting element for resetting the first positioning steel ball, wherein the first positioning column has three first positioning grooves corresponding to the control valve stem being in the horizontal leg action position, the middle position, and the vertical leg action position, respectively, and the first positioning steel ball is located in the first positioning groove to achieve position locking of the control valve stem.

[0016] Furthermore, the reversing valve stem is provided with a second positioning steel ball, a second positioning column, and a second elastic resetting element for resetting the second positioning steel ball, wherein the second positioning column has three second positioning grooves corresponding to the reversing valve stem being in the extended position, the middle position, and the retracted position of the actuator, respectively, and the second positioning steel ball is located in the second positioning groove to achieve position locking of the reversing valve stem.

[0017] The present invention has the following technical effects:

[0018] (1) The multi-way reversing valve group of the present invention has an outrigger protection function. Specifically, the present invention is provided with two-stage valve plates, namely, an oil-passing reversing valve plate as a first-stage valve plate and an outrigger control valve plate as a second-stage valve plate. The oil inlet and oil return in the outrigger control valve plate must pass through the oil-passing reversing valve plate, that is, all outrigger retraction and extension actions must first operate the oil-passing reversing valve plate. Only under the premise of operating the oil-passing reversing valve plate, the outrigger control valve plate can be operated to make the outrigger make corresponding movements. In other words, in order to make the outrigger move, the oil-passing reversing valve plate and the outrigger control valve plate must be operated in sequence. In this way, the phenomenon of outrigger retraction due to misoperation of the control valve stem on the outrigger control valve plate or misoperation of the reversing valve stem on the oil-passing reversing valve plate can be prevented, thereby eliminating safety hazards and providing a guarantee for safe operation.

[0019] (2) The reversing valve stem on the oil-passing reversing valve plate in the present invention has an actuator extension position and an actuator retracted position, that is, when the reversing valve stem is in the actuator extension position, operating the leg control valve plate can only make the legs extend, and when the reversing valve stem is in the actuator retracted position, operating the leg control valve plate can only make the legs retract. This design makes the retraction and extension operations of all legs clear and organized, avoids the situation where the leg retraction and extension operation instructions are unclear due to too many legs, and further improves the safety during operation.

[0020] (3) Both the reversing valve stem and the control valve stem are provided with a positioning steel ball and a positioning groove for locking the valve stem position, so that the position of the valve stem can be kept stable without applying external force, which further ensures safe operation.

[0021] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 The top view of the multi-way reversing valve group for leg extension and protection according to an embodiment of the present invention is shown;

[0024] Figure 2 The side view structure of the multi-way reversing valve group for leg extension and protection according to an embodiment of the present invention is shown;

[0025] Figure 3The internal structure of the oil-passing reversing valve piece in the multi-way reversing valve group for leg extension and protection according to an embodiment of the present invention is shown;

[0026] Figure 4 The internal structure of the outrigger control valve piece in the multi-way reversing valve group for outrigger extension and protection according to an embodiment of the present invention is shown;

[0027] Figure 5 The side view structure of the first bridge valve plate in the multi-way reversing valve group for leg extension and protection according to an embodiment of the present invention is shown;

[0028] Figure 6 The side view structure of the second bridge valve plate in the multi-way reversing valve group for leg extension and protection according to an embodiment of the present invention is shown;

[0029] Figure 7 The side view structure of the third bridge valve plate in the multi-way reversing valve group for leg extension and protection according to an embodiment of the present invention is shown; and

[0030] Figure 8 The hydraulic principle diagram of a multi-way reversing valve group for outrigger extension and protection according to an embodiment of the present invention.

[0031] Description of Reference Numerals

[0032] 1a, first leg control valve plate; 1b, second leg control valve plate;

[0033] 1c, the third leg control valve plate; 1d, the fourth leg control valve plate;

[0034] 11. Control valve stem; 111. First positioning steel ball;

[0035] 112. First positioning column; 113. First elastic reset element;

[0036] 114. first positioning groove; 12. sixth oil passage;

[0037] 13. The seventh oil passage; 14. The eighth oil passage;

[0038] 2. Oil-passing reversing valve disc; 21. Reversing valve stem;

[0039] 211. second positioning steel ball; 212. second positioning column;

[0040] 213. Second elastic reset element; 214. Second positioning groove;

[0041] 22. The ninth oil passage; 23. The tenth oil passage;

[0042] 24. 11th oil passage; 25. 12th oil passage;

[0043] 26. Oil return channel; 31. First bridge valve plate;

[0044] 311, first oil passage; 312, second oil passage;

[0045] 313, the third oil channel; 32, the second bridge valve plate;

[0046] 321, fourth oil passage; 322, fifth oil passage;

[0047] 33. The third bridge valve plate; 4. The inlet and outlet oil valve plates;

[0048] 5. Oil return body; 100. Middle oil channel;

[0049] 200. Oil return hole. DETAILED DESCRIPTION

[0050] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0051] like Figure 1 and Figure 8 As shown, the multi-way reversing valve group for leg extension and protection of the present invention includes an oil-through reversing valve plate 2 and four leg control valve plates, wherein the four leg control valve plates are arranged in parallel with each other, the oil-through reversing valve plate 2 is connected in series with the four leg control valve plates arranged in parallel, and the four leg control valve plates are composed of a first leg control valve plate 1a, a second leg control valve plate 1b, a third leg control valve plate 1c, and a fourth leg control valve plate 1d arranged in parallel in sequence.

[0052] Among them, each of the leg control valve plates is provided with a first oil circuit corresponding to a rodless chamber connected to a horizontal leg driving actuator, a second oil circuit corresponding to a rodless chamber connected to a vertical leg driving actuator, a mid-position oil channel 100, and a control valve stem 11 for switching the oil circuit, and the control valve stem 11 has a horizontal leg actuation position in which the first oil circuit is connected, a vertical leg actuation position in which the second oil circuit is connected, and an intermediate position in which both the first oil circuit and the second oil circuit are blocked.

[0053] The oil-passing reversing valve plate 2 is provided with a third oil circuit for supplying oil to the rod chambers of all horizontal leg driving actuators and the rod chambers of all vertical leg driving actuators, a fourth oil circuit for returning oil to the rod chambers of all horizontal leg driving actuators and the rod chambers of all vertical leg driving actuators, a fifth oil circuit for supplying oil to the first oil circuit and the second oil circuit on all leg control valve plates, a sixth oil circuit for returning oil to the rodless chambers of all horizontal leg driving actuators and the rodless chambers of all vertical leg driving actuators, which is connected to the first oil circuit and the second oil circuit on all leg control valve plates, a mid-position oil channel 100, and a reversing valve stem 21.

[0054] Among them, the reversing valve stem 21 has an actuator extended position in which the fifth oil circuit and the fourth oil circuit are connected, an actuator retracted position in which the third oil circuit and the sixth oil circuit are connected, and an intermediate position in which the third oil circuit, the fourth oil circuit, the fifth oil circuit, and the sixth oil circuit are all blocked.

[0055] like Figure 1 and Figure 2 As shown, the multi-way reversing valve group of the present invention is provided with an oil inlet P connected to both the third oil circuit and the fifth oil circuit, a pressure output port P1, and an oil return port T connected to both the fourth oil circuit and the sixth oil circuit.

[0056] When the reversing valve stem 21 is in the middle position, the oil-passing reversing valve plate 2 and the middle oil passages 100 on the four leg control valve plates are connected to form a middle oil circuit, and the oil inlet P and the pressure output port P1 are connected through the middle oil circuit. The oil enters from the oil inlet P and flows into other valve bodies through the pressure output port P1 for simple power output.

[0057] When the reversing valve stem 21 is in the actuator extension position, the middle oil passage 100 in the oil-passing reversing valve plate 2 is blocked, the middle oil passage is disconnected, the fourth oil passage returns oil, and the fifth oil passage takes in oil;

[0058] When the reversing valve stem 21 is in the actuator retracted position, the middle oil passage 100 in the oil-passing reversing valve plate 2 is blocked, the middle oil passage is disconnected, the sixth oil passage returns oil, and the third oil passage takes in oil.

[0059] Among them, when the reversing valve stem 21 is in the extended position of the actuator and the control valve stem 11 is in the horizontal leg action position, the horizontal leg is extended; when the reversing valve stem 21 is in the extended position of the actuator and the control valve stem 11 is in the vertical leg action position, the vertical leg is extended; when the reversing valve stem 21 is in the retracted position of the actuator and the control valve stem 11 is in the horizontal leg action position, the horizontal leg is retracted; when the reversing valve stem 21 is in the retracted position of the actuator and the control valve stem 11 is in the vertical leg action position, the vertical leg is retracted.

[0060] The first oil circuit of each leg control valve plate in the present invention has an A oil port for correspondingly connecting to a rodless chamber oil port of a horizontal leg driving actuator, and the second oil circuit of each leg control valve plate has a B oil port for correspondingly connecting to a rodless chamber oil port of a vertical leg driving actuator.

[0061] Specifically, the first leg control valve plate 1a is provided with two oil ports A1 and B1, the second leg control valve plate 1b is provided with two oil ports A2 and B2, the third leg control valve plate 1c is provided with two oil ports A3 and B3, and the fourth leg control valve plate 1d is provided with two oil ports A4 and B4.

[0062] The oil-passing reversing valve plate 2 has a C oil port for communicating with the rod chamber oil ports of all horizontal leg driving actuators and the rod chamber oil ports of all vertical leg driving actuators, and the C oil port is connected to both the third oil circuit and the fourth oil circuit.

[0063] like Figure 1 As shown, the oil-passing reversing valve plate 2 is arranged between the second leg control valve plate 1b and the third leg control valve plate 1c, a first bridge valve plate 31 is arranged between the oil-passing reversing valve plate 2 and the second leg control valve plate 1b, and a second bridge valve plate 32 is arranged between the oil-passing reversing valve plate 2 and the third leg control valve plate 1c. Figure 5 and Figure 6 As shown, both the first bridge valve plate 31 and the second bridge valve plate 32 are provided with a mid-position oil passage 100 to form a mid-position oil circuit.

[0064] Among them, the oil circuit connection between the oil reversing valve plate 2 and the second leg control valve plate 1b and the first leg control valve plate 1a is realized through the first bridge valve plate 31, and the connection between the oil inlet P and the fifth oil circuit and the third oil circuit can also be realized through the first bridge valve plate 31; the oil circuit connection between the oil reversing valve plate 2 and the third leg control valve plate 1c and the fourth leg control valve plate 1d is realized through the second bridge valve plate 32.

[0065] Specifically, Figure 5As shown, the first bridge valve plate 31 is provided with a first oil passage 311 for connecting the third oil passage and the fifth oil passage, which is communicated with the middle oil passage 100 of the first bridge valve plate 31, and a second oil passage 312 and a third oil passage 313 which are communicated with each other. Figure 6 As shown, the second bridge valve plate 32 is provided with a fourth oil passage 321 and a fifth oil passage 322 which are interconnected.

[0066] like Figure 4 As shown, each of the outrigger control valve plates is provided with a sixth oil passage 12, a seventh oil passage 13 connected to the B oil port, and an eighth oil passage 14 connected to the A oil port, wherein the sixth oil passage 12 and the seventh oil passage 13 form a second oil passage, and the sixth oil passage 12 and the eighth oil passage 14 form a first oil passage.

[0067] Among them, when the control valve stem 11 is in the horizontal leg action position, the sixth oil channel 12 is connected with the eighth oil channel 14, and the sixth oil channel 12 and the seventh oil channel 13 are blocked; when the control valve stem 11 is in the vertical leg action position, the sixth oil channel 12 is connected with the seventh oil channel 13, and the sixth oil channel 12 and the eighth oil channel 14 are blocked; when the control valve stem 11 is in the middle position, the sixth oil channel 12 is blocked from the seventh oil channel 13 and the eighth oil channel 14.

[0068] Among them, the second oil passage 312 and the fourth oil passage 321 are both used to connect the fifth oil passage and the sixth oil passage, the sixth oil passage 12 in the first leg control valve plate 1a, the sixth oil passage 12 in the second leg control valve plate 1b, and the third oil passage 313 are connected, and the sixth oil passage 12 in the third leg control valve plate 1c, the sixth oil passage 12 in the fourth leg control valve plate 1d, and the fifth oil passage 322 are connected.

[0069] The above-mentioned fifth oil circuit and the sixth oil circuit are connected to the third oil passage 313 through the second oil passage 312 and then connected to the first leg control valve plate 1a and the sixth oil passage 12 in the second leg control valve plate 1b; the above-mentioned fifth oil circuit and the sixth oil circuit are connected to the fifth oil passage 322 through the fourth oil passage 321 and then connected to the third leg control valve plate 1c and the sixth oil passage 12 in the fourth leg control valve plate 1d.

[0070] Furthermore, if Figures 3 to 6 As shown, the oil-passing reversing valve plate 2 is provided with a ninth oil passage 22 connected to the first oil passage 311, a tenth oil passage 23 connected to the C oil port, an eleventh oil passage 24 for connecting the second oil passage 312 and the fourth oil passage 321, a twelfth oil passage 25 connected to the eleventh oil passage 24, and an oil return passage 26.

[0071] Among them, the ninth oil passage 22 and the tenth oil passage 23 form a third oil passage, the tenth oil passage 23 and the return oil passage 26 form a fourth oil passage, the ninth oil passage 22, the twelfth oil passage 25, and the eleventh oil passage 24 form a fifth oil passage, and the eleventh oil passage 24, the twelfth oil passage 25, and the return oil passage 26 form a sixth oil passage.

[0072] When the reversing valve rod 21 is in the actuator extension position, the ninth oil passage 22 is connected to the twelfth oil passage 25, the tenth oil passage 23 is connected to the oil return passage 26, the ninth oil passage 22 is blocked from the tenth oil passage 23, and the twelfth oil passage 25 is blocked from the oil return passage 26;

[0073] When the reversing valve stem 21 is in the actuator retracted position, the ninth oil passage 22 is connected to the tenth oil passage 23, the twelfth oil passage 25 is connected to the oil return passage 26, the ninth oil passage 22 and the twelfth oil passage 25 are blocked, and the tenth oil passage 23 and the oil return passage 26 are blocked;

[0074] When the reversing valve rod 21 is in the middle position, the ninth oil passage 22 is blocked from the tenth oil passage 23 and the twelfth oil passage 25 , and the oil return passage 26 is blocked from the tenth oil passage 23 and the twelfth oil passage 25 .

[0075] It can be seen from the above content that the multi-way reversing valve group of the present invention has a leg protection function. Specifically, the present invention is provided with two-stage valve plates, namely, the oil-passing reversing valve plate as the first-stage valve plate and the leg control valve plate as the second-stage valve plate. The oil inlet and oil return in the leg control valve plate need to pass through the oil-passing reversing valve plate, that is, all leg retraction and extension actions must first operate the oil-passing reversing valve plate. Only under the premise of operating the oil-passing reversing valve plate, the leg control valve plate is operated to make the leg make corresponding movements. In other words, in order to make the leg move, the oil-passing reversing valve plate and the leg control valve plate must be operated in turn. In this way, the phenomenon of retraction of the leg due to misoperation of the control valve stem on the leg control valve plate or misoperation of the reversing valve stem on the oil-passing reversing valve plate can be prevented, thereby eliminating safety hazards and providing guarantee for safe operation.

[0076] The reversing valve stem on the oil-passing reversing valve plate in the present invention has an actuator extending position and an actuator retracting position, that is, when the reversing valve stem is in the actuator extending position, operating the leg control valve plate can only make the legs extend, and when the reversing valve stem is in the actuator retracting position, operating the leg control valve plate can only make the legs retract. Such a design makes the retraction and extension operations of all legs clear and organized, avoids the situation where the leg retraction and extension operation instructions are unclear due to too many legs, and further improves the safety during operation.

[0077] like Figures 1 to 6As shown, the oil-passing reversing valve plate 2, the four leg control valve plates, the first bridge valve plate 31, and the second bridge valve plate 32 are all provided with oil return holes 200 for returning oil, wherein the oil return holes 200 in the oil-passing reversing valve plate 2 are connected with the oil return passage 26, all the oil return holes 200 are connected to form an oil return passage, and the oil return port T is connected with the oil return passage to realize oil return.

[0078] like Figure 8 As shown, the multi-way reversing valve group of the present invention also includes a pressure protection unit connected to the oil inlet P for protecting the valve plate and the actuator. The pressure protection unit is a safety valve, the oil inlet of the safety valve is connected to the oil inlet P, and the oil outlet of the safety valve is connected to the oil return port T. When the oil pressure exceeds the set pressure value of the safety valve, the oil inlet and the oil outlet of the safety valve are connected to realize the protection function.

[0079] like Figures 1 to 7 As shown, the multi-way reversing valve group of the present invention also includes an inlet and outlet oil valve plate 4 and a third bridge valve plate 33 arranged adjacent to the first leg control valve plate 1a, wherein the third bridge valve plate 33 is located between the inlet and outlet oil valve plate 4 and the first leg control valve plate 1a, and a mid-position oil passage 100 and an oil return hole 200 are also provided in the third bridge valve plate 33, and the sixth oil passage 12 in the first leg control valve plate 1a is closed by the third bridge valve plate 33, and the safety valve, the oil inlet P, and the oil return port T are all arranged on the inlet and outlet oil valve plate 4.

[0080] Reference Figures 1 to 4 As shown, the multi-way reversing valve group of the present invention further includes an oil return body 5 for returning oil. In addition, the oil return body 5 can also close the sixth oil passage 12 in the fourth leg control valve plate 1d.

[0081] The oil inlet and outlet valve plates 4, the third bridge valve plate 33, the first leg control valve plate 1a, the second leg control valve plate 1b, the first bridge valve plate 31, the oil reversing valve plate 2, the second bridge valve plate 32, the third leg control valve plate 1c, the fourth leg control valve plate 1d, and the oil return body 5 in the present invention are fixedly connected together by a bolt assembly to form a multi-way reversing valve group.

[0082] like Figure 4 As shown, the control valve stem 11 is provided with a first positioning steel ball 111, a first positioning column 112, and a first elastic resetting element 113 for resetting the first positioning steel ball 111, wherein the first positioning column 112 has three first positioning grooves 114 corresponding to the control valve stem 11 being in the horizontal leg action position, the middle position, and the vertical leg action position, respectively, and the first positioning steel ball 111 is located in the first positioning groove 114 to achieve position locking of the control valve stem 11.

[0083] like Figure 3 As shown, the reversing valve stem 21 is provided with a second positioning steel ball 211, a second positioning column 212, and a second elastic resetting element 213 for resetting the second positioning steel ball 211, wherein the second positioning column 212 has three second positioning grooves 214 corresponding to the reversing valve stem 21 being in the actuator extended position, the middle position, and the actuator retracted position, respectively, and the second positioning steel ball 211 is located in the second positioning groove 214 to achieve position locking of the reversing valve stem 21.

[0084] The first elastic reset element 113 and the second elastic reset element 213 both include a spring and a top plate, and the top plate has an inclined surface for pressing the steel ball.

[0085] The above-mentioned reversing valve stem and control valve stem are both provided with a positioning steel ball and a positioning groove for locking the valve stem position, so that the position of the valve stem can be kept stable without applying external force, which further ensures safe operation.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-way reversing valve group for leg extension and protection, which is provided with an oil inlet P, a pressure output port P1, and an oil return port T, characterized in that: include: A plurality of outrigger control valve plates, each of which is provided with a first oil circuit for correspondingly communicating with a rodless cavity of a horizontal outrigger drive actuator, a second oil circuit for correspondingly communicating with a rodless cavity of a vertical outrigger drive actuator, a middle oil passage (100), and a control valve stem (11) for switching the oil circuits, wherein the control valve stem (11) has a horizontal outrigger actuation position in which the first oil circuit is connected, a vertical outrigger actuation position in which the second oil circuit is connected, and an intermediate position in which both the first oil circuit and the second oil circuit are blocked; and An oil-transmitting reversing valve plate (2) is provided with a third oil circuit for supplying oil to the rod chambers of all horizontal outrigger driving actuators and the rod chambers of all vertical outrigger driving actuators, a fourth oil circuit for returning oil to the rod chambers of all horizontal outrigger driving actuators and the rod chambers of all vertical outrigger driving actuators, a fifth oil circuit for supplying oil to the first oil circuit and the second oil circuit on all outrigger control valve plates, a sixth oil circuit for returning oil to the rodless chambers of all horizontal outrigger driving actuators and the rodless chambers of all vertical outrigger driving actuators, the sixth oil circuit being connected to the first oil circuit and the second oil circuit on all outrigger control valve plates, a mid-position oil passage (100), and a reversing valve stem (21). The reversing valve rod (21) has an actuator extension position in which the fifth oil circuit and the fourth oil circuit are both connected, an actuator retracted position in which the third oil circuit and the sixth oil circuit are both connected, and an intermediate position in which the third oil circuit, the fourth oil circuit, the fifth oil circuit, and the sixth oil circuit are all blocked. Wherein, when the reversing valve stem (21) is in the middle position, the oil-passing reversing valve plate (2) and the middle oil passages (100) on the plurality of leg control valve plates form a middle oil circuit to connect the oil inlet P and the pressure output port P1; when the reversing valve stem (21) is in the actuator extension position, the fourth oil circuit returns oil and the fifth oil circuit enters oil; when the reversing valve stem (21) is in the actuator retracted position, the sixth oil circuit returns oil and the third oil circuit enters oil.

2. The multi-way reversing valve group for leg extension and protection according to claim 1 is characterized in that: The outrigger control valve plates are provided with four, each of which has an A oil port on the first oil circuit for correspondingly connecting to a rodless chamber oil port of a horizontal outrigger driving actuator, and each of which has a B oil port on the second oil circuit for correspondingly connecting to a rodless chamber oil port of a vertical outrigger driving actuator, and the oil-through reversing valve plate (2) has a C oil port for connecting to the rod chamber oil ports of all horizontal outrigger driving actuators and the rod chamber oil ports of all vertical outrigger driving actuators.

3. The multi-way reversing valve group for leg extension and protection according to claim 2 is characterized in that: The four outrigger control valve plates are composed of a first outrigger control valve plate (1a), a second outrigger control valve plate (1b), a third outrigger control valve plate (1c), and a fourth outrigger control valve plate (1d) which are arranged in sequence in parallel; the oil-passing reversing valve plate (2) is arranged between the second outrigger control valve plate (1b) and the third outrigger control valve plate (1c); a first bridge valve plate (31) is arranged between the oil-passing reversing valve plate (2) and the second outrigger control valve plate (1b); and a second bridge valve plate (32) is arranged between the oil-passing reversing valve plate (2) and the third outrigger control valve plate (1c). The first bridge valve plate (31) is used to achieve oil circuit communication between the oil-passing reversing valve plate (2) and the second leg control valve plate (1b), and is also used to achieve communication between the oil inlet P and the fifth oil circuit and the third oil circuit, and the second bridge valve plate (32) is used to achieve oil circuit communication between the oil-passing reversing valve plate (2) and the third leg control valve plate (1c).

4. The multi-way reversing valve group for leg extension and protection according to any one of claims 1 to 3, characterized in that: It also includes a pressure protection unit communicated with the oil inlet P for protecting the valve plate and the actuator.

5. The multi-way reversing valve assembly for leg extension and protection according to claim 4 is characterized in that: The pressure protection unit is a safety valve, the oil inlet of the safety valve is connected to the oil inlet P, and the oil outlet of the safety valve is connected to the oil return port T.

6. The multi-way reversing valve group for leg extension and protection according to any one of claims 1 to 3, characterized in that: The control valve stem (11) is provided with a first positioning steel ball (111), a first positioning column (112), and a first elastic resetting element (113) for resetting the first positioning steel ball (111), wherein the first positioning column (112) has three first positioning grooves (114) corresponding to the control valve stem (11) being in a horizontal leg action position, a middle position, and a vertical leg action position, respectively, and the first positioning steel ball (111) is located in the first positioning groove (114) to achieve position locking of the control valve stem (11).

7. The multi-way reversing valve group for leg extension and protection according to any one of claims 1 to 3, characterized in that: The reversing valve stem (21) is provided with a second positioning steel ball (211), a second positioning column (212), and a second elastic resetting element (213) for resetting the second positioning steel ball (211), wherein the second positioning column (212) has three second positioning grooves (214) corresponding to the reversing valve stem (21) being in an actuator extended position, an intermediate position, and an actuator retracted position, respectively, and the second positioning steel ball (211) is located in the second positioning groove (214) to achieve position locking of the reversing valve stem (21).

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