Rivet pressing device for production of distribution box

Abstract

A rivet pressing device for production of a distribution box belongs to the technical field of equipment production and comprises a base, a machine body, a hydraulic cylinder, an air cylinder, a rivet head assembly, a punch, a guide rod, a supporting plate, a demolding assembly and an auxiliary positioning assembly. Wherein the machine body is arranged on the base, the hydraulic cylinder is fixedly arranged on the machine body, the air cylinder is fixedly arranged at the upper end of the hydraulic cylinder, and a hydraulic cylinder piston rod and an air cylinder piston rod are connected end to end through a coupler; the riveting head assembly is fixedly arranged at the output end of the hydraulic cylinder, the punch is arranged at the lower end of the riveting head assembly in a threaded connection mode, and the guide rods are fixedly arranged on the two sides of the riveting head assembly through connecting plates and movably penetrate through the machine body. The supporting plates are symmetrically arranged on the side wall of the machine body, one end of the demolding assembly is movably arranged on the guide rod, and the middle end of the demolding assembly is movably arranged on the supporting plates; the auxiliary positioning assembly is arranged on the front wall of the machine body, a workpiece clamped on the punch can be demolded, rivet pressing personnel are assisted in identifying the position of the positioning hole, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical equipment production, and in particular to a riveting device for producing a distribution box. Background Art

[0002] A distribution box is an electrical device that is mainly used to distribute electrical energy and control circuits. It can distribute input electrical energy to multiple output branches to meet the power needs of different equipment or areas.

[0003] Outdoor distribution boxes are often installed in public places such as streets, parks, and squares in cities. Due to the harsh outdoor environment, it may be affected by factors such as strong winds, dust, and temperature changes, which requires higher riveting strength for the distribution box. When the pressure of the riveting machine increases, the deformed rivets are easy to hold the punch, causing the workpiece to be stuck on the punch; if there is oil, impurities, etc. on the surface of the rivet, these substances will also melt or deform during riveting, sticking the workpiece and the punch together. The distribution box body and mounting plate are relatively thin. If the workpiece is stuck behind the punch and shaken and pulled hard, it will cause the distribution box to deform and the punch surface to wear, which will not only increase production costs, but also delay production progress. At the same time, since the large area of ​​the distribution box and the mounting plate often obstructs the line of sight, it is difficult for operators to judge the position of the positioning holes on the workbench, affecting the production efficiency of riveting. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a riveting device for the production of distribution boxes, which at least partially solves the problems raised in the above background technology.

[0005] The technical solution adopted by the present invention is as follows: a riveting device for the production of distribution boxes, comprising a base, a machine body, a hydraulic cylinder, an air cylinder, a rivet head assembly, a punch, a guide rod, a support plate, a demoulding component and an auxiliary positioning component, wherein the machine body is arranged on the base, the hydraulic cylinder is fixedly arranged on the machine body, the air cylinder is fixedly arranged on the upper end of the hydraulic cylinder, and the piston rod of the hydraulic cylinder is connected end to end with the piston rod of the air cylinder through a coupling; The rivet head assembly is fixedly arranged on the output end of the hydraulic cylinder, the punch is threadedly connected to the lower end of the rivet head assembly, the guide rod is fixedly arranged on both sides of the rivet head assembly through a connecting plate, and the guide rod is movably arranged to penetrate the machine body; The support plate is symmetrically arranged on the side wall of the machine body, one end of the demoulding component is movably arranged on the guide rod, and the middle end of the demoulding component is movably arranged on the support plate; The auxiliary positioning component is arranged on the front wall of the machine body.

[0006] Furthermore, the demolding assembly includes a driving folding rod, a rotating folding rod, a stabilizing rod and a pressure block. The lower end of the driving folding rod is hinged and movably arranged on the outer side wall of the guide rod. The bending part of the rotating folding rod is movably arranged on the support plate through a rotating shaft. The upper end of the driving folding rod is movably connected to the upper end of the rotating folding rod. The upper end of the stabilizing rod is rotatably and movably arranged on the support plate. The pressure block is connected to the lower ends of the rotating folding rod and the stabilizing rod. The stabilizing rod is arranged in parallel with the lower rod section of the rotating folding rod.

[0007] In a further embodiment, the folding angles of the driving folding rod and the rotating folding rod are both between 120° and 150°, and the two folding angles are arranged opposite to each other.

[0008] In a further embodiment, the length of the lower rod section of the driving folding rod and the rotating folding rod is greater than the length of the upper rod section.

[0009] Furthermore, the machine body includes a column, a workbench and a mounting seat, the column is fixed on the base, the workbench is arranged on the front wall of the column and close to the base, the mounting seat is arranged on the front wall of the column and above the mounting seat, the hydraulic cylinder is movably penetrated on the mounting seat, the workbench is provided with a lower mold, a positioning pin is fixed on the lower mold, and the positioning pin is arranged below the punch.

[0010] Furthermore, the support plate is symmetrically arranged on the side wall of the mounting seat, and a movable groove is provided on the support plate. The driving folding rod is movably arranged in the movable groove, the bending part of the rotating curved rod is movably arranged in the movable groove through a rotating shaft, and the upper end of the stabilizing rod is movably arranged in the interactive groove through a rotating shaft.

[0011] Furthermore, the auxiliary positioning assembly is arranged on the front wall of the mounting seat, and the auxiliary positioning assembly includes an inclined seat, a clamping cylinder and a laser generator. The inclined seat is fixedly arranged on the front wall of the machine body, the clamping cylinder is fixedly arranged on the inclined surface of the inclined seat and the clamping cylinder is made of elastic material, the laser generator is clamped in the clamping cylinder, and the output end of the laser generator is provided with a zoom lens for controlling the laser beam.

[0012] In a further embodiment, stress grooves are provided on the column, the workbench and the side walls of the mounting seat.

[0013] Furthermore, a control cabinet is installed in the stress groove of the side wall of the column, and a control circuit of the control cabinet is connected to a foot switch via an electric wire.

[0014] The beneficial effects achieved by the present invention using the above structure are as follows: When the punch completes riveting and rises, the demoulding component can automatically perform the demoulding operation. Under the push of the rivet head assembly, the pressure block at the lower end of the rotating folding rod is automatically moved diagonally downward close to the punch position and the height is lowered to below the punch, so that the adhered workpiece is smoothly pushed off from the punch, realizing an automated demoulding process, avoiding the problem of workpiece sticking to the punch, ensuring the continuity of production, and effectively improving production efficiency. This demoulding method makes the workpiece of the distribution box less likely to deform, helps to ensure the quality and dimensional accuracy of the workpiece, meets the distribution box's high requirements for component accuracy, and reduces workpiece damage caused by improper demoulding. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the three-dimensional structure of a pressure riveting device for producing a distribution box according to an embodiment of the present invention; Figure 2 A front view of a riveting device for producing a distribution box according to an embodiment of the present invention; Figure 3 A right view of a riveting device for producing a distribution box according to an embodiment of the present invention Figure 4 For the embodiment of the present invention Figure 1 The enlarged view of point A in the middle; Figure 5 For the embodiment of the present invention Figure 2 Enlarged view of point B in the middle.

[0016] Among them, 1. base, 2. machine body, 3. hydraulic cylinder, 4. cylinder, 5. rivet head assembly, 6. punch, 7. guide rod, 8. support plate, 9. demoulding assembly, 10. auxiliary positioning assembly, 11. driving folding rod, 12. rotating folding rod, 13. stabilizing rod, 14. pressing block, 15. column, 16. workbench, 17. mounting seat, 18. lower mold, 19. positioning pin, 20. movable groove, 21. inclined seat, 22. clamping cylinder, 23. laser generator, 24. zoom lens, 25. stress groove, 26. control cabinet, 27. foot switch.

[0017] The accompanying drawings are used to provide further understanding of the embodiments and constitute a part of the specification. They are used for explanation together with the embodiments and do not constitute a limitation of the embodiments. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection.

[0019] In the description of the embodiments, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the embodiments.

[0020] In public places such as streets, parks, and squares in cities, outdoor distribution boxes are often installed. Due to the harsh outdoor environment, it may be affected by strong winds, dust, temperature changes and other factors, which requires higher riveting strength for the distribution box. When the pressure of the riveting machine increases, the deformed rivets are easy to hold the punch, causing the workpiece to be stuck on the punch; if there is oil, impurities, etc. on the surface of the rivet, these substances will also melt or deform during riveting, and the workpiece and the punch will stick together. The distribution box body and the mounting plate are relatively thin. If the workpiece is stuck behind the punch and shaken and pulled hard, it will cause the distribution box to deform and the punch surface to wear, which will not only increase production costs, but also delay production progress; at the same time, due to the large area of ​​the distribution box and the mounting plate, which often obstructs the line of sight, it is difficult for operators to judge the position of the positioning holes on the workbench, affecting the production efficiency of riveting.

[0021] After recognizing the above problems, the present application proposes and discloses a riveting device for the production of distribution boxes, which can demould the workpiece stuck on the punch, assist the riveting personnel in identifying the position of the locating hole, and improve production efficiency.

[0022] Referring to the accompanying drawings, Figure 1 , Figure 2 and Figure 3 As shown, the embodiment of the present disclosure provides a riveting device for distribution box production, including a base 1, a body 2, a hydraulic cylinder 3, a cylinder 4, a rivet head assembly 5, a punch 6, a guide rod 7, a support plate 8, a demoulding component 9 and an auxiliary positioning component 10, wherein the body 2 is arranged on the base 1, the hydraulic cylinder 3 is fixedly arranged on the body 2, the cylinder 4 is fixedly arranged on the upper end of the hydraulic cylinder 3, and the piston rod of the hydraulic cylinder 3 is connected end to end with the piston rod of the cylinder 4 through a coupling; The rivet head assembly 5 is fixedly arranged on the output end of the hydraulic cylinder 3, the punch 6 is threadedly connected to the lower end of the rivet head assembly 5 through a connecting plate, the guide rod 7 is fixedly arranged on both sides of the rivet head assembly 5, and the guide rod 7 is movably arranged through the machine body 2; The support plate 8 is symmetrically arranged on the side wall of the body 2, one end of the demoulding component 9 is movably arranged on the guide rod 7, the middle end of the demoulding component 9 is movably arranged on the support plate 8, and the auxiliary positioning component 10 is arranged on the front wall of the body 2.

[0023] In this embodiment, when the device is started, the piston rod of the air cylinder 4 drives the piston rod of the hydraulic cylinder 3 to quickly move the punch 6 to a position close to the workpiece, and then the hydraulic cylinder 3 provides a large pressure so that the rivet head assembly 5 drives the punch 6 to descend for the riveting operation. Due to the compressibility of the gas and the rapid response characteristics of the air pressure system, when it is necessary to quickly replace the workpiece or adjust the position of the fixture, the air cylinder 4 can complete the corresponding action within a few seconds, and the pressure regulating valve and the flow regulating valve in the hydraulic system are adjusted by the control cabinet 26, so that the riveting pressure can be controlled within a very small error range.

[0024] The guide rod 7 can limit the freedom of the punch 6 in the vertical direction so that it can only move along a vertical trajectory, thereby ensuring that the riveting head can accurately perform riveting operations on the workpiece, improving the accuracy and quality of riveting, and reducing poor riveting caused by the deviation of the riveting head.

[0025] When the punch 6 completes riveting and rises, the rivet head assembly 5 drives the guide rod 7 to rise, and the guide rod 7 drives one end of the demoulding component 9 to rise and the other end to fall. The fallen end is close to the riveted workpiece and pushes it off the punch 6, thereby improving production efficiency and accelerating production progress.

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the demoulding assembly 9 includes a driving folding rod 11, a rotating folding rod 12, a stabilizing rod 13 and a pressing block 14. The lower end of the driving folding rod 11 is hinged and movably arranged on the outer wall of the guide rod 7. The bending part of the rotating folding rod 12 is movably arranged on the support plate 8 through a rotating shaft. The upper end of the driving folding rod 11 is movably connected to the upper end of the rotating folding rod 12. The upper end of the stabilizing rod 13 is rotatably and movably arranged on the support plate 8. The pressing block 14 is connected to the lower ends of the rotating folding rod 12 and the stabilizing rod 13. The stabilizing rod 13 is arranged in parallel with the lower rod section of the rotating folding rod 12.

[0027] In this embodiment, when the punch 6 presses down to rivet, the rivet head assembly 5 drives the guide rod 7 to descend, and the guide rod 7 pulls the driving folding rod 11 to descend, and the upper end of the driving folding rod 11 pulls the rotating folding rod 12 to rotate counterclockwise around the rotating axis at its bending point, thereby driving the pressure block 14 at the lower end of the rotating folding rod 12 to move diagonally upward away from the position of the punch 6; when the punch 6 completes the riveting, the output end of the hydraulic cylinder 3 drives the guide rod 7 to rise through the rivet head assembly 5, and the guide rod 7 pushes the driving folding rod 11 to rise, and the upper end of the driving folding rod 11 pushes the upper end of the rotating folding rod 12 to rotate clockwise around the rotating axis at its bending point, thereby driving the pressure block 14 at the lower end of the rotating folding rod 12 to move diagonally downward close to the position of the punch 6 and drop its height to below the punch 6, thereby pushing the adhered workpiece off the punch 6, making the workpiece of the distribution box less likely to deform, reducing the surface wear of the punch 6, and improving production efficiency. The stabilizing rod 13 and the lower rod section of the rotating folding rod 12 together fix the pressing block 14 , while increasing the upper force limit of the pressing block 14 and improving the service life of the demoulding assembly 9 .

[0028] like Figure 2 and Figure 4 As shown, the folding angles of the driving folding rod 11 and the rotating folding rod 12 are both between 120° and 150°, and the two folding angles are arranged opposite to each other.

[0029] In this embodiment, the force applied by the driving folding rod 11 can be decomposed into a tangential force perpendicular to the rotation axis of the rotating folding rod 12 and a normal force along a certain rod section of the rotating folding rod 12. The tangential force causes the rotating folding rod 12 to rotate.

[0030] like Figure 2 and Figure 4 As shown, the length of the lower rod section of the driving folding rod 11 and the rotating folding rod 12 is greater than the length of the upper rod section.

[0031] In this embodiment, since the length of the lower rod section of the driving folding rod 11 and the rotating folding rod 12 is greater than the length of the upper rod section, when the driving folding rod 11 is raised or lowered a short distance, the lower end of the rotating folding rod 12 can be driven to rotate a longer distance, thereby achieving that when the punch 6 is pressed down, the height of the pressing block 14 is higher than the bottom of the punch 6, and when the punch 6 is raised, the height of the pressing block 14 is lower than the bottom of the punch 6.

[0032] like Figure 1 , Figure 2 and Figure 3 As shown, the body 2 includes a column 15, a workbench 16 and a mounting seat 17. The column 15 is fixedly arranged on the base 1. The workbench 16 is arranged on the front wall of the column 15 and is arranged close to the base 1. The mounting seat 17 is arranged on the front wall of the column 15 and is arranged above the mounting seat 17. The hydraulic cylinder 3 is movably arranged on the mounting seat 17. A lower mold 18 is arranged on the workbench 16. A positioning pin 19 is fixedly arranged on the lower mold 18. The positioning pin 19 is arranged below the punch 6.

[0033] In this embodiment, the corresponding holes on the workpiece of the generator box can be sleeved on the positioning pins 19, and the positioning holes of the lower mold 18 cooperate with the positioning pins 19 to ensure that the position of the workpiece is correct each time riveting, thereby ensuring the riveting accuracy.

[0034] like Figure 4 As shown, the support plate 8 is symmetrically arranged on the side wall of the mounting seat 17, and a movable groove 20 is provided on the support plate 8. The driving folding rod 11 is movably arranged in the movable groove 20, the bending part of the rotating curved rod is movably arranged in the movable groove 20 through a rotating shaft, and the upper end of the stabilizing rod 13 is movably arranged in the interactive groove through a rotating shaft.

[0035] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the auxiliary positioning assembly 10 is arranged on the front wall of the mounting seat 17, and the auxiliary positioning assembly 10 includes an inclined seat 21, a clamping cylinder 22 and a laser generator 23. The inclined seat 21 is fixedly arranged on the front wall of the body 2, and the clamping cylinder 22 is fixedly arranged on the inclined surface of the inclined seat 21 and the clamping cylinder 22 is made of elastic material. The laser generator 23 is clamped in the clamping cylinder 22, and a zoom lens 24 is provided at the output end of the laser generator 23 for controlling the laser beam.

[0036] In this embodiment, the laser beam of the laser generator 23 is irradiated on the positioning pin 19. When the large distribution box and the mounting plate block the line of sight, the laser can be used to quickly locate the rivet hole on the workpiece. The pattern of the laser emitted by the laser generator 23 is a circular ring. The size of the circular ring pattern can be adjusted by the zoom lens 24 to correspond to rivet holes of different sizes, so that it is convenient to accurately place it on the lower mold 18 for pressure riveting operation, thereby improving production efficiency.

[0037] In this embodiment, the closed ring formed by the annular laser beam is more visually intuitive. Compared with a cross-shaped laser beam, the operator can more clearly observe the positional relationship between the object and the laser beam, thereby performing positioning operations more quickly and accurately.

[0038] like Figure 1 and Figure 3 As shown, stress grooves 25 are provided on the side walls of the column 15 , the workbench 16 and the mounting seat 17 .

[0039] In this embodiment, the hydraulic cylinder 3 and the air cylinder 4 on the mounting seat 17 need to frequently apply force to the lower mold 18 on the workbench 16. The stress groove 25 can enable the body 2 to maintain good performance during multiple cycles of loading and unloading stress, thereby preventing the body 2 from suddenly failing due to excessive local stress.

[0040] like Figure 1 , Figure 2 and Figure 3 As shown, a control cabinet 26 is installed in the stress groove 25 on the side wall of the column 15. The control circuit of the control cabinet 26 is connected to a foot switch 27 through an electric wire. There are contacts inside the foot switch 27. When the foot pedal is stepped on, the contacts are closed to make the circuit conductive, thereby transmitting a signal to the control cabinet 26 for controlling the action of the air cylinder 4 or the hydraulic cylinder 3.

[0041] In this embodiment, the control cabinet 26 is mainly used to control various electrical operations of the riveting machine. It includes many electrical components such as power switches, contactors, relays, controllers, motor drivers, etc. These components work together to achieve power control, action sequence control, and parameter setting and adjustment of the riveting device. The control cabinet 26 can be used to set the riveting pressure, travel speed of the riveting head, working mode and other parameters of the riveting machine.

[0042] It should be noted that, in this article, 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.

[0043] Although embodiments have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and the scope of the embodiments is defined by the appended claims and their equivalents.

[0044] The above description of the implementation mode is not restrictive, and the drawings show only one of the implementation modes, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the scope of protection.

Claims

1. A riveting device for distribution box production, characterized in that: The machine body (2) comprises a base (1), a machine body (2), a hydraulic cylinder (3), an air cylinder (4), a rivet head assembly (5), a punch (6), a guide rod (7), a support plate (8), a demoulding component (9) and an auxiliary positioning component (10), wherein the machine body (2) is arranged on the base (1), the hydraulic cylinder (3) is fixedly arranged on the machine body (2), the air cylinder (4) is fixedly arranged on the upper end of the hydraulic cylinder (3), and the piston rod of the hydraulic cylinder (3) and the piston rod of the air cylinder (4) are connected end to end via a coupling; The rivet head assembly (5) is fixedly arranged on the output end of the hydraulic cylinder (3), the punch (6) is threadedly connected to the lower end of the rivet head assembly (5), the guide rod (7) is fixedly arranged on both sides of the rivet head assembly (5) through a connecting plate, and the guide rod (7) is movably arranged to penetrate the machine body (2); The support plate (8) is symmetrically arranged on the side wall of the machine body (2); one end of the demoulding component (9) is movably arranged on the guide rod (7); and the middle end of the demoulding component (9) is movably arranged on the support plate (8); The auxiliary positioning component (10) is arranged on the front wall of the machine body (2).

2. The riveting device for distribution box production according to claim 1 is characterized in that: The demoulding assembly (9) comprises a driving folding rod (11), a rotating folding rod (12), a stabilizing rod (13) and a pressing block (14); the lower end of the driving folding rod (11) is hingedly movably arranged on the outer wall of the guide rod (7); the bending part of the rotating folding rod (12) is movably arranged on the support plate (8) through a rotating shaft; the upper end of the driving folding rod (11) is movably connected to the upper end of the rotating folding rod (12); the upper end of the stabilizing rod (13) is rotatably movably arranged on the support plate (8); the pressing block (14) is connected to the lower ends of the rotating folding rod (12) and the stabilizing rod (13); and the stabilizing rod (13) and the lower rod section of the rotating folding rod (12) are arranged in parallel.

3. The riveting device for distribution box production according to claim 2 is characterized in that: The folding angles of the driving folding rod (11) and the rotating folding rod (12) are both between 120° and 150°, and the two folding angles are arranged opposite to each other.

4. The riveting device for distribution box production according to claim 2 is characterized in that: The length of the lower rod section of the driving folding rod (11) and the rotating folding rod (12) is greater than the length of the upper rod section.

5. The riveting device for distribution box production according to claim 1 is characterized in that: The machine body (2) comprises a column (15), a workbench (16) and a mounting seat (17); the column (15) is fixedly mounted on the base (1); the workbench (16) is arranged on the front wall of the column (15) and is arranged close to the base (1); the mounting seat (17) is arranged on the front wall of the column (15) and is arranged above the mounting seat (17); the hydraulic cylinder (3) is movably arranged on the mounting seat (17); a lower mold (18) is arranged on the workbench (16); a positioning pin (19) is fixedly mounted on the lower mold (18); and the positioning pin (19) is arranged below the punch (6).

6. The riveting device for distribution box production according to claim 5 is characterized in that: The support plate (8) is symmetrically arranged on the side wall of the mounting seat (17), and a movable groove (20) is provided on the support plate (8). The driving folding rod (11) is movably arranged in the movable groove (20), the bending part of the rotating curved rod is movably arranged in the movable groove (20) through a rotating shaft, and the upper end of the stabilizing rod (13) is movably arranged in the interactive groove through a rotating shaft.

7. The riveting device for distribution box production according to claim 5 is characterized in that: The auxiliary positioning assembly (10) is arranged on the front wall of the mounting seat (17), and comprises an inclined seat (21), a clamping tube (22) and a laser generator (23). The inclined seat (21) is fixedly arranged on the front wall of the machine body (2), the clamping tube (22) is fixedly arranged on the inclined surface of the inclined seat (21) and the clamping tube (22) is made of elastic material, the laser generator (23) is clamped in the clamping tube (22), and a zoom lens (24) is provided at the output end of the laser generator (23) for controlling the laser beam.

8. The riveting device for distribution box production according to claim 5 is characterized in that: Stress grooves (25) are provided on the side walls of the upright column (15), the workbench (16) and the mounting seat (17).

9. The riveting device for producing a distribution box according to claim 8, characterized in that: A control cabinet (26) is installed in the stress groove (25) on the side wall of the column (15), and a control circuit of the control cabinet (26) is connected to a foot switch (27) via an electric wire.

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