A welding fixture pneumatic control logic control gas circuit and welding fixture

Abstract

The invention relates to the technical field of body-in-white welding fixtures, and in particular to a pneumatic logic control air circuit for a welding fixture and a welding fixture, wherein the control air circuit comprises: a multi-stage reversing valve group, each comprising a plurality of clamping reversing valves; the control air circuit comprises a release and clamping control air circuit; the clamping control air circuit comprises a sequence control air circuit and a plurality of clamping control branches, the clamping control branch comprises an AND valve and a vehicle type selection air circuit, the vehicle type selection air circuit comprises a plurality of vehicle type control air ports, and the vehicle type control air ports of different vehicle types cooperate with the sequence control air circuit to realize control of different clamping sequences of different vehicle types, and when it is necessary to increase control of other vehicle types, it is only necessary to increase the vehicle type control air port in the vehicle type selection air circuit; when it is necessary to increase the number of clamping reversing valves in the reversing valve group, it is only necessary to increase the clamping control branch, as well as increase the output ports of the sequence control air circuit and the release control air circuit, so as to solve the problem that the existing pneumatic control logic design is complicated and difficult to edit and modify.

Description

Technical Field

[0001] The invention relates to the technical field of body-in-white welding fixtures, and in particular to a welding fixture pneumatic logic control air circuit and a welding fixture. Background Art

[0002] The pneumatic control logic circuit is simple in control principle. It can realize logical sequence action under the combination of simple logic pneumatic components. The control and power only need compressed air to complete. It does not need complicated electrical components and PLC and electrical modules and other electrical systems. It is widely used in some simple stand-alone equipment, such as automobile welding fixtures. Especially in small sub-assembly fixtures with about 10 clamping points, it is widely used for its convenient operation, low investment cost, easy fault finding, etc.

[0003] However, when there are many clamping points on the welding fixture, or even when multiple varieties are mixed and switched for production, online programming and program modification cannot be achieved like PLC. When adding new products to the multi-variety welding fixture, the design and modification of the pneumatic control logic air circuit is very difficult, and there is no fault query display function, so it is very difficult to find the problem point. This problem was encountered when the fixture and air circuit of the side rear outer panel assembly fixture of a series of models were modified to add models. Before the modification, the fixture could already produce 6 models of vehicles in mixed flow. After the modification, 3 new models were added, and a total of 9 models could be produced, and there were as many as 77 clamping point cylinders, far exceeding the design limit of 10 clamping points. After three changes were made to the air circuits of the original six types of vehicle models, they became complicated and confusing, until the logical air circuit diagram for normal use could not be implemented. In the combination logic design of the vehicle model and the first clamping, a multi-layer AND valve design was used, and in the combination logic design of the vehicle model and the second clamping, a multi-layer OR valve design was used, making the logic very confusing and difficult to implement. Due to the large number of fixture actuators and many main air circuits and control air circuits, it is very easy to make mistakes during the connection process. Summary of the invention

[0004] In view of the defects existing in the prior art, the purpose of the present invention is to provide a welding fixture pneumatic control logic control air circuit and a welding fixture, which can solve the problems in the prior art that the pneumatic control logic design of the welding fixture is complex, there are many main air circuits and control air circuits, it is difficult to edit and modify, and it is easy to make errors.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] In one aspect, the present invention provides a pneumatic logic control gas circuit for a welding fixture, comprising:

[0007] A multi-stage reversing valve group, each stage of the reversing valve group includes a plurality of clamping reversing valves, the drive input ports of all the clamping reversing valves are used to communicate with the drive air circuit, and the drive control port of each clamping reversing valve is used to connect with at least one cylinder;

[0008] Control gas circuits corresponding to the reversing reversing valve groups at each level, the control gas circuits comprising a loosening control gas circuit and a clamping control gas circuit, the loosening control gas circuit is connected to the loosening control ports of all the clamping reversing valves in the reversing valve group, and the clamping control gas circuit is connected to the clamping control ports of all the clamping reversing valves in the reversing valve group;

[0009] The clamping control air circuit includes a sequence control air circuit and a plurality of clamping control branches corresponding to each of the clamping reversing valves, the clamping control branch includes an AND valve and a vehicle type selection air circuit, the output port of the AND valve is connected to the clamping control port corresponding to the clamping reversing valve, the vehicle type selection air circuit includes a plurality of vehicle type control air ports corresponding to the clamping reversing valve, the output port of the vehicle type selection air circuit is connected to one of the control ports corresponding to the AND valve, and the sequence control air circuit is connected to another control port corresponding to all the AND valves in the reversing reversing valve group;

[0010] The sequence control air circuit and the vehicle type selection air circuit in the clamping control air circuit are used to cooperate and jointly control the corresponding reversing valve group to switch to the clamping position to perform the clamping action, and the release control air circuit is used to control the corresponding reversing valve group to switch to the release position to perform the release action.

[0011] In some optional schemes, the vehicle type selection air circuit includes multiple valves, the output port of the first level valve is connected to the control port of the valve, the input port of the first level valve is connected to the output port of the second level valve or the vehicle type control air port, the output port of the i-th level valve is connected to the input port of the i-1-th level valve, the input port of the i-th level valve is connected to the output port of the i+1-th level valve or the vehicle type control air port, i=2...N-1, N is the number of vehicle types adapted to the corresponding clamping reversing valve.

[0012] In some optional schemes, it also includes a vehicle type control air circuit, which includes multiple manual two-position five-way valves, the input port of the first-level manual two-position five-way valve is used to communicate with the drive air circuit, the two-position output ports of the first-level manual two-position five-way valve are respectively connected to the input port of the second-level manual two-position five-way valve or serve as the vehicle type control air port of the corresponding OR valve, the input port of the j-th level manual two-position five-way valve is connected to one of the two-position output ports of the j-1-th level manual two-position five-way valve, the two-position output ports of the j-th level manual two-position five-way valve are respectively connected to the input port of the j+1-th level manual two-position five-way valve or serve as the vehicle type control air port of the corresponding OR valve, j=2...M-1, M is greater than or equal to N.

[0013] In some optional schemes, the order control air circuit corresponding to the control air circuit of the first-stage reversing directional valve group includes a first two-position three-way valve and a first connecting branch with the same number as the clamping reversing valves in the first-stage reversing valve group, the input port of the first two-position three-way valve is used to connect with the driving air circuit, the output port of the first two-position three-way valve is connected to one end of all the first connecting branches, and the other end of the first connecting branch is connected one-to-one with the control port of each of the valves in the reversing directional valve group. When the first two-position three-way valve is in the connecting position, the first two-position three-way valve connects the driving air circuit with all the first connecting branches. When the first two-position three-way valve is in the exhaust position, the first two-position three-way valve connects all the first connecting branches with the external environment through its exhaust port to exhaust.

[0014] In some optional schemes, the order control air circuit corresponding to the control air circuit of the k-th level reversing directional valve group includes a third two-position three-way valve and a third connecting branch with the same number as the clamping reversing valves in the k-th level reversing valve group, the input port of the third two-position three-way valve is connected to a drive control port of one of the clamping reversing valves in the k-1-th level reversing directional valve group for controlling the clamping, the output port of the third two-position three-way valve is connected to one end of all the third connecting branches, and the other end of the third connecting branch is connected one-to-one with the control port of each of the valves in the reversing directional valve group, when the third two-position three-way valve is in the connecting position, the third two-position three-way valve connects the driving air circuit with all the third connecting branches, and when the third two-position three-way valve is in the exhaust position, the third two-position three-way valve connects all the third connecting branches with the external environment through its exhaust port for exhaust.

[0015] In some optional schemes, the release control air circuit includes a second two-position three-way valve and a second connecting branch with the same number of clamping reversing valves in the corresponding reversing valve group, the input port of the second two-position three-way valve is connected to a drive control port of one of the clamping reversing valves in the next-level reversing reversing valve group for controlling the release, the output port of the second two-position three-way valve is connected to one end of all the second connecting branches, and the other end of the second connecting branch is connected one-to-one with the release control ports of each of the clamping reversing valves in the reversing reversing valve group. When the second two-position three-way valve is in the connecting position, the second two-position three-way valve connects the driving air circuit with all the second connecting branches, and when the second two-position three-way valve is in the exhaust position, the second two-position three-way valve connects all the second connecting branches with the external environment through its exhaust port to exhaust.

[0016] In some optional schemes, the clamping reversing valve is a pneumatic two-position five-way valve, and the drive control port of the clamping reversing valve includes a clamping drive control port connection for controlling clamping and a release drive control port for controlling release, the clamping drive control port is used to connect with the clamping drive chamber of the cylinder, and the release drive control port is used to connect with the release drive chamber of the cylinder, the clamping reversing valve also includes a clamping exhaust port and a release exhaust port, when the clamping reversing valve is in the clamping position, the drive input port is connected with the clamping drive control port, and the release drive control port is connected with the clamping exhaust port, when the clamping reversing valve is in the release position, the drive input port is connected with the release drive control port, and the clamping drive control port is connected with the release exhaust port.

[0017] In some optional schemes, a loose exhaust pipeline and a clamping exhaust pipeline are further included, wherein the loose exhaust pipeline is connected to all the loose exhaust ports, and the clamping exhaust pipeline is connected to all the clamping exhaust ports.

[0018] In some optional solutions, silencers are provided at the ends of the loose exhaust line and the clamp exhaust line.

[0019] On the other hand, the present invention further provides a welding fixture, comprising: a pneumatic logic control gas circuit of the welding fixture as described in any one of the above items.

[0020] Compared with the prior art, the advantages of the present invention are: when in use, by connecting the vehicle control air ports corresponding to different vehicle models and cooperating with the sequence control air circuit, the control of different vehicle models and different clamping sequences can be realized. When each clamping reversing valve needs to increase the control of other vehicle models, it is only necessary to add the corresponding vehicle control air port in the vehicle selection air circuit, and there is no need to redesign the air circuit for the individual control of the clamping reversing valve; when it is necessary to increase the number of clamping reversing valves in a certain level of reversing valve group, it is only necessary to add the corresponding clamping control branch circuit, as well as the output ports of the sequence control air circuit and the release control air circuit, and there is no need to add the sequence control air circuit and the release control air circuit. Therefore, the air circuit design of this scheme improves the editability of the entire control air circuit, facilitates the subsequent addition of functions, and each branch circuit is relatively independent, making it easy to troubleshoot. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1Schematic diagram of the air circuit control of one of the clamping reversing valves in the first-stage reversing valve group in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the gas circuit control of another clamping reversing valve in the first-stage reversing valve group in an embodiment of the present invention;

[0024] Figure 3 Schematic diagram of the sequence control gas path corresponding to the first-stage reversing valve group in an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the third release control air circuit in an embodiment of the present invention;

[0026] Figure 5 Schematic diagram of the air circuit control of one of the clamping reversing valves in the second-stage reversing valve group in an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of a vehicle control gas circuit in an embodiment of the present invention;

[0028] Figure 7 Schematic diagram of the sequence control gas path corresponding to the second-stage reversing valve group in an embodiment of the present invention;

[0029] Figure 8 A schematic diagram of a second release control air circuit in an embodiment of the present invention;

[0030] Fig. 9 Schematic diagram of the control gas circuit corresponding to the second-stage reversing valve group in an embodiment of the present invention.

[0031] In the figure: 1. Clamping reversing valve; 11. Drive control port; 12. Clamping control port; 13. Release control port; 2. Drive air circuit; 3. Release control air circuit; 31. Second two-position three-way valve; 4. Clamping control air circuit; 41. Sequence control air circuit; 411. First two-position three-way valve; 412. Third two-position three-way valve; 413. Pneumatic two-position three-way valve; 42. Clamping control branch; 421. AND valve; 422. Vehicle type selection air circuit; 4221. OR valve; 5. Vehicle type control air circuit; 51. Manual two-position five-way valve; 6. Cylinder; 7. Release exhaust pipeline; 8. Clamp exhaust pipeline; 9. Muffler. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0033] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0034] like Figure 1-Figure 5 ,as well as Figure 6-Figure 9 As shown, on the one hand, the present invention provides a welding fixture pneumatic control logic control gas circuit, comprising:

[0035] A multi-stage reversing valve group, each stage of the reversing valve group includes a plurality of clamping reversing valves 1, the drive input ports of all the clamping reversing valves are used to communicate with the drive air circuit 2, and the drive control port 11 of each clamping reversing valve 1 is used to connect with at least one cylinder 6;

[0036] Control gas circuits corresponding to the reversing directional valve groups at each level, the control gas circuits include a loosening control gas circuit 3 and a clamping control gas circuit 4, the loosening control gas circuit 3 is connected to the loosening control ports 13 of all the clamping directional valves 1 in the reversing valve group, and the clamping control gas circuit 4 is connected to the clamping control ports 12 of all the clamping directional valves 1 in the reversing valve group;

[0037] The clamping control air circuit includes a sequence control air circuit 41 and a plurality of clamping control branches 42 corresponding to each clamping reversing valve 1, the clamping control branch 42 includes an AND valve 421 and a vehicle type selection air circuit 422, the output port of the AND valve 421 is connected to the clamping control port 12 of the corresponding clamping reversing valve 1, the vehicle type selection air circuit 422 includes a plurality of vehicle type control air ports corresponding to the clamping reversing valve 1, the output port of the vehicle type selection air circuit 422 is connected to one of the control ports of the corresponding AND valve 421, and the sequence control air circuit 41 is connected to the other control ports of all the AND valves 421 in the corresponding reversing reversing valve group;

[0038] The sequence control air circuit 41 and the vehicle type selection air circuit 422 in the clamping control air circuit are used to cooperate and jointly control the corresponding reversing valve group to switch to the clamping position to perform the clamping action, and the release control air circuit 3 is used to control the corresponding reversing valve group to switch to the release position to perform the release action.

[0039] In this solution, the drive input ports of all the clamping reversing valves 1 in the multi-stage reversing valve group are connected to the drive air circuit 2, and the drive control port 11 of each clamping reversing valve 1 is connected to at least one cylinder 6, and the cylinder 6 is connected to the clamping member. Each stage of the reversing reversing valve group is controlled by a control air circuit, and the release control air circuit 3 controls the corresponding reversing valve group to switch to the release position to perform the release action. The sequence control air circuit 41 in the clamping control air circuit and the vehicle type selection air circuit 422 in the clamping control branch 42 jointly control the clamping reversing valves 1 in the corresponding reversing valve group to switch to the clamping position to perform the clamping action by cooperating with the valve 421. Among them, each level of the reversing valve group is controlled by the same sequence control air circuit 41, and each clamping reversing valve 1 in each level of the reversing valve group can be set with a vehicle control air port corresponding to different vehicle models through the vehicle model selection air circuit 422. When in use, by connecting the vehicle model control air ports corresponding to different vehicle models and cooperating with the sequence control air circuit 41, the control of different vehicle models and different clamping sequences can be realized. When each clamping reversing valve 1 needs to increase the control of other vehicle models, it is only necessary to add the corresponding vehicle model control air port in the vehicle model selection air circuit 422, and there is no need to redesign the air circuit for the separate control of the clamping reversing valve 1; when it is necessary to increase the number of clamping reversing valves 1 in a certain level of the reversing valve group, it is only necessary to add the corresponding clamping control branch 42, and increase the output port of the sequence control air circuit 41 and the release control air circuit 3, and there is no need to add the sequence control air circuit 41 and the release control air circuit 3. Therefore, the air circuit design of this scheme improves the editability of the entire control air circuit, facilitates the addition of subsequent functions, and each branch is relatively independent, which is easy to troubleshoot.

[0040] In this example, a three-stage reversing valve group is involved, wherein the first-stage reversing valve group includes 14 clamping reversing valves 1, the second-stage reversing valve group includes 15 clamping reversing valves 1, and the third-stage reversing valve group includes 3 clamping reversing valves 1.

[0041] When performing the clamping and unclamping steps, perform the clamping step first:

[0042] First, the vehicle model control air port corresponding to the vehicle model to be processed is selected through the vehicle model selection air circuit 422 in all the clamping control branches 42, that is, one of the control ports of the clamping control branch 42 and the valve 421 in all the clamping reversing valves 1 to be used for the vehicle model is ventilated and pressurized through the vehicle model selection air circuit 422;

[0043] Then, the first clamping is performed, and the first-stage sequence control air circuit 41 is ventilated with another control port of the 14 clamping reversing valves 1 in the first-stage reversing valve group corresponding to the valve 421. The two control ports are both pressured and connected to the valve 421, and the air pressure is transmitted to the clamping control port 12 of the first-stage clamping reversing valve 1 of the corresponding vehicle type, so that the clamping reversing valve 1 of the corresponding vehicle type in the first-stage reversing valve group is in the clamping position, and the corresponding cylinder 6 can drive the clamping member to perform the first-stage clamping operation;

[0044] The second clamping is performed again, and the air is ventilated through the second-stage sequential control air circuit 41 and the other control port of the valve 421 corresponding to the 15 clamping reversing valves 1 in the second-stage reversing valve group. The two control ports are connected to the valve 421 with pressure, and the air pressure is transmitted to the clamping control port 12 of the second-stage clamping reversing valve 1 of the corresponding vehicle type, so that the clamping reversing valve 1 of the corresponding vehicle type in the second-stage reversing valve group is in the clamping position, and the corresponding cylinder 6 can drive the clamping member to perform the first-stage clamping operation;

[0045] Then, the third clamping is performed, and the other control port of the two clamping reversing valves 1 in the third-stage reversing valve group is ventilated through the third-stage sequential control air circuit 41 and the valve 421 corresponding to the two clamping reversing valves 1 in the third-stage reversing valve group. The two control ports are both pressured and connected to the valve 421, and the air pressure is transmitted to the clamping control port 12 of the third-stage clamping reversing valve 1 of the corresponding vehicle type, so that the clamping reversing valve 1 of the corresponding vehicle type in the third-stage reversing valve group is in the clamping position, and the corresponding cylinder 6 can drive the clamping member to perform the first-stage clamping operation;

[0046] Follow the release steps:

[0047] First, the clamping reversing valve 1 after the clamping operation is performed in the third-stage reversing valve group is opened for the first time, and the third-stage sequence control air circuit 41 is exhausted first, and then the release control port 13 of the clamping reversing valve 1 is inflated and pressurized through the release control air circuit 3 corresponding to the two clamping reversing valves 1 in the third-stage reversing valve group, so that the clamping reversing valve 1 after the clamping operation is performed in the third-stage reversing valve group is switched to the release position;

[0048] Then, the clamping reversing valve 1 after the clamping operation is performed in the third-stage reversing valve group is opened for the second time, and the second-stage sequence control air circuit 41 is exhausted first, and then the release control port 13 of the clamping reversing valve 1 is inflated and pressurized through the release control air circuit 3 corresponding to the 15 clamping reversing valves 1 in the second-stage reversing valve group, so that the clamping reversing valve 1 after the clamping operation is performed in the third-stage reversing valve group is switched to the release position;

[0049] Then, the clamping reversing valve 1 is opened for the third time after the clamping operation is performed in the first-stage reversing valve group. First, the first-stage sequence control air circuit 41 is exhausted, and then the release control port 13 of the clamping reversing valve 1 is inflated and pressurized through the release control air circuit 3 corresponding to the 14 clamping reversing valves 1 in the first-stage reversing valve group, so that the clamping reversing valve 1 is switched to the release position after the clamping operation is performed in the first-stage reversing valve group.

[0050] like Figure 1 and Figure 2As shown, in some optional embodiments, the vehicle type selection air circuit 422 includes multiple valves 4221, the output port of the first-level valve 4221 is connected to the control port of the valve 421, the input port of the first-level valve 4221 is connected to the output port of the second-level valve 4221 or the vehicle type control air port, the output port of the i-th level valve 4221 is connected to the input port of the i-1-th level valve 4221, the input port of the i-th level valve 4221 is connected to the output port of the i+1-th level valve 4221 or the vehicle type control air port, i=2...N-1, N is the number of vehicle types adapted to the corresponding clamping reversing valve 1.

[0051] In this embodiment, N-1 or valves 4221 are connected to reserve connection ports for N vehicle model control air ports, and the N connection ports are connected to the N vehicle model control air ports. When selecting a vehicle model, it is only necessary to ventilate and pressurize the vehicle model control port of the selected vehicle model to ventilate the output port of the entire vehicle model selection air circuit 422. This design can avoid directly connecting all vehicle model control ports through a multi-port, which will cause the problem of chaotic series connection when selecting a vehicle model.

[0052] like Figure 2 As shown, a specific embodiment of the vehicle type selection gas circuit 422 is given below, taking the clamping reversing valve V3 as an example:

[0053] The clamping control port 12 of the clamping reversing valve V3 is connected to the output port of valve 421, and one of the control ports 102 of valve 421 is connected to the first-stage sequence control air circuit 41, and the other control port of valve 421 is connected to the output port of the first stage or valve 4221 in the vehicle model selection air circuit 422. The vehicle model selection air circuit 422 includes 2 stages or valves 4221, and the output port of the second stage or valve 4221 is connected to the left control port of the first stage or valve 4221, and the right control port of the first stage or valve 4221 is used to connect to the vehicle model control air port of the Q model, the left control port of the second stage or valve 4221 is used to connect to the vehicle model control air port of the B model, and the right control port of the second stage or valve 4221 is used to connect to the vehicle model control air port of the A model.

[0054] When selecting to process the parts of model A, inputting control air pressure to the model control air port of model A can make the model selection air path 422 open, so as to apply control air pressure to one of the control ports of the corresponding connection valve 421. When selecting to process the parts of model B or model Q, the same applies.

[0055] The selection of the gas circuit 422 for other clamping reversing valves 1 corresponding to vehicle models is similar to the above example, and a reasonable gas circuit can be designed according to requirements.

[0056] like Figure 6As shown, in some optional embodiments, the pneumatic logic control air circuit of the welding fixture also includes a vehicle type control air circuit 5, and the vehicle type control air circuit 5 includes multiple manual two-position five-way valves 51, the input port of the first-level manual two-position five-way valve 51 is used to communicate with the drive air circuit 2, the two-position output ports of the first-level manual two-position five-way valve 51 are respectively connected to the input port of the second-level manual two-position five-way valve 51 or serve as the vehicle type control air port of the corresponding valve 4221, the input port of the j-th level manual two-position five-way valve 51 is connected to one of the two-position output ports of the j-1-th level manual two-position five-way valve 51, the two-position output ports of the j-th level manual two-position five-way valve 51 are respectively connected to the input port of the j+1-th level manual two-position five-way valve 51 or serve as the vehicle type control air port of the corresponding valve 4221, j=2...M-1, M is greater than or equal to N.

[0057] In this embodiment, M vehicle model control air ports are formed by connecting M-1 manual two-position five-way valves 51, and each connection port of all vehicle model selection air circuits 422 is connected to the corresponding vehicle model control air port in the M vehicle model control air ports. When selecting a vehicle model, it is only necessary to manually adjust the valve position of the manual two-position five-way valve 51 to connect the vehicle model control air port of the selected vehicle model with the driving air circuit 2, so that the output port of the entire vehicle model selection air circuit 422 can be ventilated to achieve the control air pressure applied to one of the control ports corresponding to the valve 421. Such a design can avoid the problem of connecting all vehicle model control ports directly through a multi-way port, which will cause the problem of random series connection when selecting a vehicle model. M is the basic number of controlled vehicle models. In other embodiments, the output port of a manual two-position five-way valve 51 can also be connected to the input port of the next-level manual two-position five-way valve 51 as the vehicle model control air port of a certain vehicle model. Therefore, the vehicle model that can be controlled by the vehicle model control air circuit 5 can be greater than M, that is, greater than the M vehicle model control air ports formed by the original M-1 manual two-position five-way valves 51.

[0058] A more specific embodiment is given below: the two-position output port of the manual two-position five-way valve 51 includes a left-position output port and a right-position output port, and the manual two-position five-way valve 51 also includes a left-position exhaust port and a right-position exhaust port. When the manual two-position five-way valve 51 is in the right position, the input port of the manual two-position five-way valve 51 is connected with the right-position output port, and the left-position output port is connected with the right-position exhaust port. When the manual two-position five-way valve 51 is in the left position, the input port of the manual two-position five-way valve 51 is connected with the left-position output port, and the right-position output port is connected with the left-position exhaust port.

[0059] In this example, the input port of the first-level manual two-position five-way valve 51 is connected to the drive air circuit 2, and the left output port and the right output port of the first-level manual two-position five-way valve 51 are respectively connected to the input ports of two second-level manual two-position five-way valves 51, and the left output port and the right output port of one second-level manual two-position five-way valve 51 are respectively the input ports of two third-level manual two-position five-way valves 51, and the left output port and the right output port of these two third-level manual two-position five-way valves 51 are respectively used as the vehicle control air ports of A, B, D and H models, which are used to be connected to the control port of the corresponding or valve 4221. The right output port of another second-level manual two-position five-way valve 51 serves as the model control air port of the E model, and the left output port is connected to the input port of another third-level manual two-position five-way valve 51. The left output port of the third-level manual two-position five-way valve 51 serves as the model control air port of the J model, and the right output port is connected to the input port of the fourth-level manual two-position five-way valve 51. The left output port of the fourth-level manual two-position five-way valve 51 serves as the model control air port of the M model, and the right output port is connected to the input port of the fifth-level manual two-position five-way valve 51. The left output port of the fifth-level manual two-position five-way valve 51 serves as the model control air port of the Q model, and the right output port serves as the model control air port of the R model.

[0060] In addition, the left output port of the first-level manual two-position five-way valve 51 also serves as the vehicle control port of the P model. The right output port of the manual two-position five-way valve 51, which is the same as the vehicle control port of the J model, also serves as the vehicle control port of the S model. The right output port of the fourth-level manual two-position five-way valve 51 also serves as the vehicle control port of the T model. An AND valve is also provided between the right output port of the fourth-level manual two-position five-way valve 51 and the input port of the fifth-level manual two-position five-way valve 51. One of the control ports of the AND valve is connected to the right output port of the fourth-level manual two-position five-way valve 51, and the other control port is connected to the connection port 501. The output port is connected to the input port of the fifth-level manual two-position five-way valve 51. Such a design can add other restriction conditions on the basis of the vehicle type controlled by the fifth-level manual two-position five-way valve 51, which are specifically set according to actual needs.

[0061] In this example, the manual two-position five-way valve 51 is provided with a left-position drive button and a right-position drive button, which are respectively located on the left and right sides of the manual two-position five-way valve 51. The left-position drive button is used to drive the manual two-position five-way valve 51 to switch to the right position; the right-position drive button is used to drive the manual two-position five-way valve 51 to switch to the left position.

[0062] like Figure 3As shown, in some optional embodiments, the order control gas circuit 41 corresponding to the control gas circuit of the first-stage reversing directional valve group includes a first two-position three-way valve 411 and a first connecting branch with the same number as the clamping reversing valve 1 in the first-stage reversing valve group, the input port of the first two-position three-way valve 411 is used to connect with the driving gas circuit 2, the output port of the first two-position three-way valve 411 is connected to one end of all the first connecting branches, and the other end of the first connecting branch is connected one-to-one with the control port of each valve 421 in the reversing directional valve group. When the first two-position three-way valve 411 is in the connecting position, the first two-position three-way valve 411 connects the driving gas circuit 2 with all the first connecting branches, and when the first two-position three-way valve 411 is in the exhaust position, the first two-position three-way valve 411 connects all the first connecting branches with the external environment through its exhaust port to exhaust.

[0063] In this example, the first two-position three-way valve 411 includes an input port, an output port and an exhaust port. When the first two-position three-way valve 411 is in the connecting position, the input port and the output port of the first two-position three-way valve 411 are connected. When the first two-position three-way valve 411 is in the connecting position, the output port and the exhaust port of the first two-position three-way valve 411 are connected. The first two-position three-way valve 411 is manually driven. When the first-stage clamping action is required, the first two-position three-way valve 411 is manually switched to the connecting position to connect the driving air circuit 2 with all the first connecting branches, and transmit the control air pressure to one of the control ports corresponding to the valve 421.

[0064] In this example, the first-stage reversing valve group includes 14 clamping reversing valves 1, and 14 AND valves 421 are correspondingly provided. The control ports 101-114 of the 14 AND valves 421 are respectively connected to the 14 first connecting branches.

[0065] like Figure 5 , Figure 7 and Fig. 9 As shown, in some optional embodiments, the order control gas circuit 41 corresponding to the control gas circuit of the k-th level reversing directional valve group includes a third two-position three-way valve 412 and a third connecting branch with the same number as the clamping reversing valve 1 in the k-th level reversing valve group, the input port of the third two-position three-way valve 412 is connected to the drive control port 11 for controlling the clamping of one of the clamping reversing valves 1 in the k-1-th level reversing directional valve group, the output port of the third two-position three-way valve 412 is connected to one end of all the third connecting branches, and the other end of the third connecting branch is connected one-to-one with the control ports of each valve 421 in the reversing reversing valve group, when the third two-position three-way valve 412 is in the connecting position, the third two-position three-way valve 412 connects the driving gas circuit 2 with all the third connecting branches, and when the third two-position three-way valve 412 is in the exhaust position, the third two-position three-way valve 412 connects all the third connecting branches with the external environment through its exhaust port to exhaust.

[0066] In this embodiment, the third two-position three-way valve 412 has the same structural form as the first two-position three-way valve 411, except that the third two-position three-way valve 412 of the sequential control gas circuit 41 in the control gas circuit corresponding to the k-th level reversing directional valve group has an input port connected to a drive control port 11 for controlling clamping of one of the clamping reversing valves 1 in the k-1-th level reversing directional valve group. That is, only after the k-1-th level reversing directional valve group performs the clamping action, will the clamping action of the k-th level reversing directional valve group continue to be performed. Such a design can avoid the execution of the next level of clamping action when the first level of clamping action has not been executed due to the accidental touch of the third two-position three-way valve 412. In this example, k is a natural number greater than or equal to 2.

[0067] A more specific embodiment is given below: the second stage reversing valve group includes 15 clamping reversing valves 1, and 15 corresponding valves 421 are provided. The control ports 101-114 of the 15 valves 421 are respectively connected to the 14 third connecting branches. The input port of the third two-position three-way valve 412 corresponding to the second stage reversing valve group is connected to the driving control port 11 for controlling clamping of the clamping reversing valve V2 in the first stage reversing reversing valve group through the connecting port ③ (such as Figure 1 and 7 The third two-position three-way valve 412 is also manually switched. The input port of the third two-position three-way valve 412 corresponding to the third-stage reversing valve group is connected to the driving control port 11 of the clamping reversing valve V1 in the second-stage reversing reversing valve group for controlling the clamping through the connecting port ④ (as shown in FIG. Figure 5 and 9 shown).

[0068] In this example, a pneumatic two-position three-way valve 413 is also arranged between the connection port ③ and the third two-position three-way valve 412, which is set according to more specific design requirements. The pneumatic two-position three-way valve 413 can be set on a control node of a certain gas circuit to achieve more complex gas circuit control.

[0069] like Figure 4 , Figure 7 and Fig. 9As shown, in some optional embodiments, the release control air circuit 3 includes a second two-position three-way valve 31 and a second connecting branch with the same number of clamping reversing valves 1 in the corresponding reversing valve group, the input port of the second two-position three-way valve 31 is connected to the drive control port 11 of one of the clamping reversing valves 1 in the next-level reversing reversing valve group for controlling the release, the output port of the second two-position three-way valve 31 is connected to one end of all the second connecting branches, and the other end of the second connecting branch is connected one-to-one with the release control port 13 of each clamping reversing valve 1 in the reversing reversing valve group, when the second two-position three-way valve 31 is in the connecting position, the second two-position three-way valve 31 connects the driving air circuit 2 with all the second connecting branches, and when the second two-position three-way valve 31 is in the exhaust position, the second two-position three-way valve 31 connects all the second connecting branches with the external environment through its exhaust port for exhaust.

[0070] In addition, the last-stage reversing valve group corresponds to the input port 0 of the second two-position three-way valve 31 in the release control air circuit 3, which is controlled separately and can be directly connected to the drive air circuit 2. In this scheme, the reverse release step of the clamping step can be realized. Taking the three-stage reversing valve group as an example, when clamping, the clamping action is performed in sequence from the first-stage reversing valve group, the second-stage reversing valve group to the third-stage reversing valve group. When releasing, the release action is performed in sequence from the third-stage reversing valve group, the second-stage reversing valve group to the first-stage reversing valve group. The third-stage reversing valve group corresponds to the first release control air circuit 3.

[0071] like Fig. 9 As shown, the input port 0 of the second two-position three-way valve 31 in the first release control air circuit 3 is connected to the drive air circuit 2, and the output port is connected to two second connecting branches (one of which is the output port 301 of the second connecting branch), which are respectively connected to the release control ports 13 of the two clamping reversing valves 1 in the third-stage reversing reversing valve group.

[0072] like Figure 8 As shown, the input port of the second two-position three-way valve 31 in the second release control air circuit 3 is connected to an output port of a valve 32, and the two control ports 302 and 303 of the valve 32 are connected to the driving control port 11 for controlling the release of two clamping directional valves 1 in the third-stage reversing directional valve group, and the output port of the second two-position three-way valve 31 in the second release control air circuit 3 is connected to the second connecting branch with the same number as the clamping directional valve 1 in the second-stage reversing directional valve group, and all the second connecting branches are provided with 15 connecting ports, namely, output ports 216-227, which are respectively connected to the release control ports 13 of each clamping directional valve 1 in the second-stage reversing directional valve group.

[0073] like Figure 4As shown, the input port 26 of the second two-position three-way valve 31 in the third release control air circuit 3 is connected to the driving control port 11 for controlling the release of the two clamping directional valves 1 in the second-stage reversing directional valve group, and the output port of the second two-position three-way valve 31 in the third release control air circuit 3 is connected to the second connecting branch with the same number as the clamping directional valve 1 in the first-stage reversing directional valve group, and all the second connecting branches are provided with output ports 115-128, a total of 14 connecting ports, which are respectively connected to the release control ports 13 of each clamping directional valve 1 in the first-stage reversing directional valve group.

[0074] In this scheme, the input port of the second two-position three-way valve 31 is connected to the drive control port 11 of one of the clamping reversing valves 1 in the next-level reversing reversing valve group for controlling the release, which can avoid confusion in the release steps due to accidental touch. For example, when the third-level reversing reversing valve group is not released, the second two-position three-way valve 31 in the release control air circuit 3 corresponding to the second-level reversing reversing valve group is in the release position, and the second-level reversing reversing valve group will not perform the release action.

[0075] In this example, the second two-position three-way valve 31 has the same structural form as the first two-position three-way valve 411. The structural form of the release control air circuit 3 is the same as that of the corresponding sequence control air circuit 41, except that the connection position of the output port of each second connecting branch is different from the connection position of the output port of the connecting branch in the corresponding sequence control air circuit 41, and the output port of each second connecting branch is connected to the release control port 13 of each clamping reversing valve 1 in the corresponding reversing reversing valve group in a one-to-one correspondence. When executing the release instruction of each clamping reversing valve 1 in the reversing reversing valve group of this level, the second two-position three-way valve 31 switches the conduction position, and the air pressure of the driving air circuit 2 is passed through the output value of each second connecting branch to the release control port 13 of each clamping reversing valve 1 in the reversing reversing valve group, so that each clamping reversing valve 1 is switched to the release position, so that the cylinder 6 connected to the drive control port 11 on the clamping reversing valve 1 performs the release action.

[0076] In some optional embodiments, the clamping reversing valve 1 is a pneumatic two-position five-way valve, and the drive control port 11 of the clamping reversing valve 1 includes a clamping drive control port connection for controlling clamping and a release drive control port for controlling release, the clamping drive control port is used to connect with the clamping drive chamber of the cylinder 6, and the release drive control port is used to connect with the release drive chamber of the cylinder 6, the clamping reversing valve 1 also includes a clamping exhaust port and a release exhaust port, when the clamping reversing valve 1 is in the clamping position, the drive input port is connected with the clamping drive control port, and the release drive control port is connected with the clamping exhaust port, when the clamping reversing valve 1 is in the release position, the drive input port is connected with the release drive control port, and the clamping drive control port is connected with the release exhaust port.

[0077] In this embodiment, the air sources used by the clamping reversing valve 1, the release control air circuit 3 and the clamping control air circuit 4 are all the driving air circuit 2, which can save air source layout, reduce the complexity of the entire air circuit, and facilitate layout.

[0078] In addition, when used on site, all pipelines and valve groups are labeled to facilitate subsequent maintenance.

[0079] In some optional embodiments, a loose exhaust pipeline 7 and a clamping exhaust pipeline 8 are further included, wherein the loose exhaust pipeline 7 is connected to all the loose exhaust ports, and the clamping exhaust pipeline 8 is connected to all the clamping exhaust ports.

[0080] In this example, all loose exhaust ports are connected by a loose exhaust pipeline 7, and all clamped exhaust ports are connected by a clamped exhaust pipeline 8, so as to achieve unified exhaust and prevent the exhaust port of the clamped reversing valve 1 from being contaminated and blocked in a messy environment.

[0081] In some optional embodiments, silencers 9 are provided at the ends of the loose exhaust line 7 and the clamp exhaust line 8 .

[0082] In this embodiment, silencers 9 are provided at the ends of the loose exhaust line 7 and the clamp exhaust line 8, which can reduce the noise when exhausting from the clamp exhaust port and the loose exhaust port, thereby improving comfort.

[0083] On the other hand, the present invention further provides a welding fixture, comprising any one of the above-mentioned welding fixture pneumatic control logic control gas circuits.

[0084] The driving input ports of all the clamping reversing valves 1 in the multi-stage reversing valve group are connected to the driving air circuit 2, and the driving control port 11 of each clamping reversing valve 1 is connected to at least one cylinder 6, and the cylinder 6 is connected to the clamping member. Each stage of the reversing reversing valve group is controlled by a control air circuit, and the release control air circuit 3 controls the corresponding reversing valve group to switch to the release position to perform the release action. The sequence control air circuit 41 in the clamping control air circuit and the vehicle type selection air circuit 422 in the clamping control branch 42 jointly control each clamping reversing valve 1 in the corresponding reversing valve group to switch to the clamping position to perform the clamping action by cooperating with the valve 421. Among them, each level of the reversing valve group is controlled by the same sequence control air circuit 41, and each clamping reversing valve 1 in each level of the reversing valve group can be set with a vehicle control air port corresponding to different vehicle models through the vehicle model selection air circuit 422. When in use, by connecting the vehicle model control air ports corresponding to different vehicle models and cooperating with the sequence control air circuit 41, the control of different vehicle models and different clamping sequences can be realized. When each clamping reversing valve 1 needs to increase the control of other vehicle models, it is only necessary to add the corresponding vehicle model control air port in the vehicle model selection air circuit 422, and there is no need to redesign the air circuit for the separate control of the clamping reversing valve 1; when it is necessary to increase the number of clamping reversing valves 1 in a certain level of the reversing valve group, it is only necessary to add the corresponding clamping control branch 42, and increase the output port of the sequence control air circuit 41 and the release control air circuit 3, and there is no need to add the sequence control air circuit 41 and the release control air circuit 3. Therefore, the air circuit design of this scheme improves the editability of the entire control air circuit, facilitates the addition of subsequent functions, and each branch is relatively independent, which is easy to troubleshoot.

[0085] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0086] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0087] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A pneumatic logic control gas circuit for a welding fixture, characterized in that: include: A multi-stage reversing valve group, each stage of the reversing valve group comprising a plurality of clamping reversing valves (1), the drive input ports of all the clamping reversing valves being used to communicate with a drive air circuit (2), and the drive control port (11) of each of the clamping reversing valves (1) being used to connect with at least one cylinder (6); Control air circuits corresponding to the reversing valve groups at each level, the control air circuits comprising a loosening control air circuit (3) and a clamping control air circuit (4), the loosening control air circuit (3) being connected to the loosening control ports (13) of all the clamping reversing valves (1) in the reversing valve group, and the clamping control air circuit (4) being connected to the clamping control ports (12) of all the clamping reversing valves (1) in the reversing valve group; The clamping control air circuit comprises a sequence control air circuit (41) and a plurality of clamping control branches (42) corresponding to each of the clamping reversing valves (1); the clamping control branch (42) comprises an AND valve (421) and a vehicle type selection air circuit (422); the output port of the AND valve (421) is connected to the clamping control port (12) corresponding to the clamping reversing valve (1); the vehicle type selection air circuit (422) comprises a plurality of vehicle type control air ports corresponding to the clamping reversing valve (1); the output port of the vehicle type selection air circuit (422) is connected to one of the control ports corresponding to the AND valve (421); and the sequence control air circuit (41) is connected to another control port corresponding to all the AND valves (421) in the reversing reversing valve group; The sequence control air circuit (41) and the vehicle type selection air circuit (422) in the clamping control air circuit are used to cooperate and jointly control the corresponding reversing valve group to switch to the clamping position to perform the clamping action, and the release control air circuit (3) is used to control the corresponding reversing valve group to switch to the release position to perform the release action.

2. The pneumatic control logic control gas circuit of the welding fixture according to claim 1, characterized in that: The vehicle type selection air circuit (422) comprises a plurality of valves (4221), wherein the output port of the first-stage valve (4221) is connected to the control port of the valve (421), the input port of the first-stage valve (4221) is connected to the output port of the second-stage valve (4221) or the vehicle type control air port, the output port of the i-th stage valve (4221) is connected to the input port of the i-1-th stage valve (4221), and the input port of the i-th stage valve (4221) is connected to the output port of the i+1-th stage valve (4221) or the vehicle type control air port, i=2...N-1, and N is the number of vehicle types to which the corresponding clamping reversing valve (1) is adapted.

3. The pneumatic control logic control gas circuit of the welding fixture as claimed in claim 2, characterized in that: The vehicle model control air circuit (5) is also included. The vehicle model control air circuit (5) includes a plurality of manual two-position five-way valves (51). The input port of the first-level manual two-position five-way valve (51) is used to communicate with the drive air circuit (2). The two-position output ports of the first-level manual two-position five-way valve (51) are respectively connected to the input port of the second-level manual two-position five-way valve (51) or serve as the vehicle model control air port of the corresponding OR valve (4221). The input port of the j-th level manual two-position five-way valve (51) is connected to one of the two-position output ports of the j-1-th level manual two-position five-way valve (51). The two-position output ports of the j-th level manual two-position five-way valve (51) are respectively connected to the input port of the j+1-th level manual two-position five-way valve (51) or serve as the vehicle model control air port of the corresponding OR valve (4221), where j=2...M-1, and M is greater than or equal to N.

4. The pneumatic control logic control gas circuit of the welding fixture as claimed in claim 1, characterized in that: The sequence control gas circuit (41) corresponding to the control gas circuit of the first-stage reversing valve group comprises a first two-position three-way valve (411) and first communication branches having the same number as the clamping reversing valves (1) in the first-stage reversing valve group, wherein the input port of the first two-position three-way valve (411) is used to communicate with the driving gas circuit (2), the output port of the first two-position three-way valve (411) is connected to one end of all the first communication branches, and the other end of the first communication branch is connected to the control ports of each of the valves (421) in the reversing valve group in a one-to-one correspondence, when the first two-position three-way valve (411) is in the communication position, the first two-position three-way valve (411) connects the driving gas circuit (2) with all the first communication branches, and when the first two-position three-way valve (411) is in the exhaust position, the first two-position three-way valve (411) connects all the first communication branches with the external environment through its exhaust port to exhaust air.

5. The pneumatic logic control gas circuit of the welding fixture as claimed in claim 4, characterized in that: The sequence control gas circuit (41) corresponding to the control gas circuit of the k-th level reversing directional valve group comprises a third two-position three-way valve (412) and a third communication branch having the same number as the clamping reversing valve (1) in the k-th level reversing directional valve group, wherein the input port of the third two-position three-way valve (412) is connected to a drive control port (11) for controlling clamping of one of the clamping reversing valves (1) in the k-1-th level reversing directional valve group, and the output port of the third two-position three-way valve (412) is connected to one end of all the third communication branches. The other end of the third connecting branch is connected to the control port of each of the AND valves (421) in the reversing valve group in a one-to-one correspondence. When the third two-position three-way valve (412) is in the connecting position, the third two-position three-way valve (412) connects the driving gas circuit (2) with all the third connecting branches. When the third two-position three-way valve (412) is in the exhaust position, the third two-position three-way valve (412) connects all the third connecting branches with the external environment through its exhaust port to exhaust.

6. The pneumatic logic control gas circuit of the welding fixture as claimed in claim 1, characterized in that: The release control air circuit (3) comprises a second two-position three-way valve (31) and second connecting branches having the same number as the clamping reversing valves (1) in the corresponding reversing valve group; an input port of the second two-position three-way valve (31) is connected to a driving control port (11) for controlling release of one of the clamping reversing valves (1) in the next-level reversing reversing valve group; an output port of the second two-position three-way valve (31) is connected to one end of all the second connecting branches; and the other end of the second connecting branch is connected to the release control ports (13) of each of the clamping reversing valves (1) in the reversing reversing valve group in a one-to-one correspondence; when the second two-position three-way valve (31) is in the connecting position, the second two-position three-way valve (31) connects the driving air circuit (2) with all the second connecting branches; and when the second two-position three-way valve (31) is in the exhaust position, the second two-position three-way valve (31) connects all the second connecting branches with the external environment through its exhaust port for exhaust.

7. The pneumatic logic control gas circuit of the welding fixture as claimed in claim 1, characterized in that: The clamping reversing valve (1) is a pneumatic two-position five-way valve. The drive control port (11) of the clamping reversing valve (1) includes a clamping drive control port connection for controlling clamping and a release drive control port for controlling release. The clamping drive control port is used to connect to the clamping drive chamber of the cylinder (6), and the release drive control port is used to connect to the release drive chamber of the cylinder (6). The clamping reversing valve (1) also includes a clamping exhaust port and a release exhaust port. When the clamping reversing valve (1) is in the clamping position, the drive input port is connected to the clamping drive control port, and the release drive control port is connected to the clamping exhaust port. When the clamping reversing valve (1) is in the release position, the drive input port is connected to the release drive control port, and the clamping drive control port is connected to the release exhaust port.

8. The pneumatic logic control gas circuit of the welding fixture as claimed in claim 7, characterized in that: It also comprises a loosening exhaust pipeline (7) and a clamping exhaust pipeline (8), wherein the loosening exhaust pipeline (7) is connected to all the loosening exhaust ports, and the clamping exhaust pipeline (8) is connected to all the clamping exhaust ports.

9. The pneumatic logic control gas circuit of the welding fixture as claimed in claim 8, characterized in that: The ends of the loose exhaust pipeline (7) and the clamp exhaust pipeline (8) are both provided with silencers (9).

10. A welding fixture, characterized in that: include: A pneumatic logic control gas circuit for a welding fixture as described in any one of claims 1 to 9.

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