Mining flame-proof and intrinsic safety type programmable control box

Abstract

The utility model discloses a mining flame-proof and intrinsic safety type programmable control box which comprises a flame-proof main cavity, an electric control module is arranged on the upper side of the flame-proof main cavity, a power supply module is arranged on the middle side of the flame-proof main cavity, a flame-proof battery cavity is fixedly installed on the lower side of the flame-proof main cavity, a power supply management system is arranged in the flame-proof battery cavity, and a power supply is arranged in the power supply management system. The left side of the explosion-proof main cavity is provided with a switch assembly, the right side of the explosion-proof main cavity is provided with an intrinsic safety wiring assembly, the electric control module, the power supply module, the power supply management system, the switch assembly and the intrinsic safety wiring assembly are all electrically connected with the central control module, and the lower side of the explosion-proof main cavity is fixedly provided with a four-core multi-core explosion-proof through-wall terminal. And a locking device is fixedly mounted at the upper part of the left side wall of the explosion-proof main cavity. The explosion suppression device can be rapidly installed, the posture of the device can be rapidly adjusted before installation so that the device can be installed in a horizontal state, the buffer device is arranged to buffer explosion shock waves, and the explosion suppression effect is improved.

Description

[Technical field]

[0001] The utility model relates to the technical field of mine control boxes, in particular to a mine flameproof and intrinsically safe programmable control box. [Background Technology]

[0002] The mine flameproof and intrinsically safe programmable control box is an electrical device used in the environment of explosive gas mixture containing methane and coal dust in coal mines. This control box adopts the flameproof and intrinsically safe design to ensure safe operation in dangerous environments. It is equipped with a programmable controller that can be programmed according to user needs to realize various complex control logics.

[0003] Patent No. CN201920641599.5 proposes a mine-use flameproof and intrinsically safe programmable information integrated control box. By setting wiring holes on the wiring chamber and setting terminals on the partition, external analog and digital quantities are transmitted to the processor in the flameproof chamber. It has strong applicability, scalability, high reliability and strong communication capabilities. Its logical control method can be realized by programming supporting software, making complex control logic simple and easy. An isolation module and an intrinsically safe power supply are provided between the input and output signals inside the control box to ensure that the connection and matching with various types of sensors, actuators, and various equipment electronic control circuits are more flexible and universal. It cannot be quickly installed in the mine, and the posture of the equipment cannot be quickly adjusted to be installed in a horizontal state. There is no buffer device to buffer the explosion shock wave to improve the flameproof effect. Therefore, the technicians in this field provide a mine-use flameproof and intrinsically safe programmable control box to solve the problem that it cannot be quickly installed in the mine, the posture of the equipment cannot be quickly adjusted to be installed in a horizontal state, and there is no buffer device to buffer the explosion shock wave to improve the flameproof effect. [Contents of the utility model]

[0004] The utility model aims to provide a flameproof and intrinsically safe programmable control box for mining, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above-mentioned purpose, a mine-use flameproof and intrinsically safe programmable control box is designed, comprising a flameproof main cavity, an electric control module is arranged on the upper side of the flameproof main cavity, a power supply module is arranged on the middle side of the flameproof main cavity, a flameproof battery cavity is fixedly installed on the lower side of the flameproof main cavity, a power supply management system is arranged in the flameproof battery cavity, a switch assembly is arranged on the left side of the flameproof main cavity, an intrinsically safe wiring assembly is arranged on the right side of the flameproof main cavity, a flameproof wiring cavity is arranged on the rear side of the flameproof main cavity, the electric control module, the power supply module, the power supply management system, the switch assembly and the intrinsically safe wiring assembly are all electrically connected to the central control module, a four-core multi-core flameproof through-wall terminal is fixedly installed on the lower side of the flameproof main cavity, and the upper part of the left wall of the flameproof main cavity is provided with a flameproof wiring cavity. A locking device is fixedly installed, a cable introduction device is fixedly installed on the lower part of the left side wall of the flameproof main cavity, an industrial control panel is fixedly installed on the upper part of the front side of the flameproof main cavity, a control keyboard is fixedly installed on the lower part of the front side of the flameproof main cavity, a plurality of quick installation mechanisms are arranged on the lower side of the flameproof main cavity, and a plurality of posture adjustment mechanisms are arranged on the lower side of the plurality of quick installation mechanisms. The electric control module comprises: a programmable module group, an intrinsically safe power supply, an Ethernet switch and an isolated safety barrier, the power supply module comprises: a transformer, a switching power supply, a fuse module, a switch quantity isolation module and a USB isolator, the power management system comprises: a filter module group and a relay module, and the industrial control panel and the control keyboard are both electrically connected to the central control module.

[0006] As a further solution of the utility model: the intrinsically safe wiring assembly includes: an intrinsically safe wiring cavity, a nine-core through-wall terminal, a functional knob, a waterproof joint and a double-layer wiring terminal. The intrinsically safe wiring cavity is fixedly installed on the right side of the flameproof main cavity, the nine-core through-wall terminal is fixedly installed on the left side of the intrinsically safe wiring cavity, the functional knob is fixedly installed on the front side of the intrinsically safe wiring cavity, and the waterproof joint and double-layer wiring terminals are fixedly installed on the right side of the intrinsically safe wiring cavity.

[0007] As a further solution of the utility model: the switch assembly includes: a combination switch and an explosion-proof switch, the combination switch is fixedly installed on the upper left side of the flameproof main cavity, and the explosion-proof switch is fixedly installed on the lower left side of the flameproof main cavity.

[0008] As a further solution of the utility model: the quick installation mechanism includes: a sliding plate, a fixed plate, a bearing plate and a locking assembly, the sliding plate is fixedly installed on the lower side of the explosion-proof main cavity, the fixed plate is slidably connected to the lower side of the sliding plate, the bearing plate is fixedly installed on the lower side of the fixed plate, the locking assembly is installed on the upper side of the bearing plate, the side wall of the sliding plate is provided with a groove, the side wall of the fixed plate is provided with an opening, and both ends of the sliding plate are provided with inclined surfaces.

[0009] As a further solution of the utility model: the locking assembly includes: a fixed cavity, a sliding rod, a first spring and a lever, the fixed cavity is fixedly mounted on the upper side of the supporting plate, the sliding rod is slidably connected in the fixed cavity, the first spring is arranged in the fixed cavity, one end of the first spring is fixedly mounted on the sliding rod, the other end of the first spring is fixedly mounted on the fixed cavity, the lever is rotatably connected to the upper side of the supporting plate through a rotating shaft, one end of the lever close to the sliding rod is movably connected to the sliding rod, one end of the sliding rod close to the fixed plate passes through an opening of the fixed plate and is tightly attached to the groove of the sliding plate, and the end of the sliding rod close to the fixed plate is provided with an inclined surface.

[0010] As a further solution of the utility model: a buffer assembly is installed on the lower side of the bearing plate.

[0011] As a further solution of the utility model: the buffer assembly includes: an upper limiting strip, a lower limiting plate and a second spring, the two upper limiting strips are fixedly mounted on the lower side of the load-bearing plate, the lower limiting plate is slidably connected between the two upper limiting strips, one end of the second spring is fixedly mounted on the lower side of the load-bearing plate through a bracket, and the other end of the second spring is fixedly mounted on the upper side of the lower limiting plate through a bracket.

[0012] As a further solution of the utility model: the posture adjustment mechanism includes: a fixed bracket, a sliding support foot, a worm gear, a threaded rod, a worm, a rotating knob and a spirit level; the fixed bracket is fixedly mounted on the lower side of the lower limiting plate; the sliding support foot is slidably connected to the fixed bracket; the worm gear is rotatably connected to the lower limiting plate; the upper side of the threaded rod is fixedly mounted on the axis of the worm gear; the lower side of the threaded rod is threadedly connected to the sliding support foot; the worm is rotatably connected to the lower limiting plate via a rotating shaft; the worm and worm gear are meshed with each other; the rotating knob is fixedly mounted on the rotating shaft of the worm; and a plurality of spirit levels are fixedly mounted on the side walls of the lower limiting plate.

[0013] Compared with the prior art, the utility model moves the flameproof main cavity, and the movement of the flameproof main cavity drives the sliding plate to move, and the sliding plate is slidably connected to the fixed plate, so that the flameproof main cavity can be quickly fixed on the fixed plate; the lever rotates to drive the sliding rod to move away from the sliding plate slot, and the sliding rod leaves the sliding plate slot, which is conducive to the sliding plate quickly leaving the locked state, and the flameproof main cavity is moved, and the movement of the flameproof main cavity drives the sliding plate to move, the inclined surface of the sliding plate is close to the inclined surface of the sliding rod, and the movement of the sliding plate causes the sliding rod to move in the direction away from the sliding plate, the first spring is compressed, and the sliding rod moves to the sliding plate slot, and the compressed first spring recovers to push the sliding rod to the sliding plate slot, which is conducive to rapid locking after the flameproof main cavity is installed; turning the knob drives the worm to rotate, and the rotation of the worm drives the worm wheel Rotation, the rotation of the worm gear drives the threaded rod to rotate, and the rotation of the threaded rod allows the sliding foot to move up and down on the fixed bracket to adjust the posture. Multiple levels are used to observe whether the overall level is level, which is conducive to quickly adjusting the horizontal posture and ensuring that the equipment body is in a horizontal state when installed; when the explosion-proof main cavity receives the explosion impact force in the left and right directions, the explosion-proof main cavity moves left and right to drive the sliding plate to move left and right, the sliding plate moves left and right to drive the fixed plate to move left and right, and the fixed plate moves left and right to drive the bearing plate to move left and right, so that the second spring undergoes elastic deformation, which is conducive to absorbing the explosion impact force and performing buffering to improve the explosion-proof effect; the utility model can be quickly installed, and the posture of the equipment can be quickly adjusted before installation to make it in a horizontal state for installation, and a buffer device is provided to buffer the explosion shock wave to improve the explosion-proof effect. [Drawings]

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is the right view of the utility model;

[0016] Figure 3 It is the left view of the utility model;

[0017] Figure 4 It is a cross-sectional view taken along line AA of the structural schematic diagram of the utility model;

[0018] Figure 5 It is a BB cross-sectional view of the schematic diagram of the structure of the utility model;

[0019] Figure 6 It is a CC cross-sectional view of the schematic diagram of the structure of the utility model;

[0020] Figure 7 This is a schematic diagram of the structure of the quick installation mechanism of the utility model;

[0021] Figure 8 It is a cross-sectional view of the locking assembly of the utility model;

[0022] Fig. 9 This is a cross-sectional view of the posture adjustment mechanism of the utility model;

[0023] In the figure: 1. Intrinsically safe wiring cavity; 2. Flameproof battery cavity; 3. Flameproof main cavity; 4. Flameproof wiring cavity; 5. Cable entry device; 6. Power management system; 7. Nine-core through-wall terminal; 8. Four-core multi-core flameproof through-wall terminal; 9. Multi-core flameproof through-wall terminal; 10. Control keyboard; 11. Combination switch; 12. Explosion-proof switch; 13. Function knob; 14. Waterproof connector; 15. Locking device; 16. Industrial control panel; 17. Programmable module group; 18. Filter module group; 19. Transformer; 20. Intrinsically safe power supply; 21. Switching power supply; 22. Fuse module; 23. Ethernet switch; 24. Switch quantity isolation module; 25. USB isolator; 26. Relay module; 27. Isolation safety barrier; 28. Double-layer terminal block; 29. ​​Sliding plate; 30. Fixed plate; 31. Load-bearing plate; 32. Fixed cavity; 33. Sliding rod; 34. First spring; 35. Lever; 36. Upper limit strip; 37. Lower limit plate; 38. Second spring; 39. Fixed bracket; 40. Sliding foot; 41. Worm gear; 42. Threaded rod; 43. Worm; 44. Level. [Specific implementation method]

[0024] The utility model is further described below in conjunction with the accompanying drawings:

[0025] Please see attached Figure 1 To Attachment Fig. 9The utility model provides a flameproof and intrinsically safe programmable control box for mining, including a flameproof main cavity 3, an electric control module is arranged on the upper side of the flameproof main cavity 3, a power module is arranged in the middle side of the flameproof main cavity 3, a flameproof battery cavity 2 is fixedly installed on the lower side of the flameproof main cavity 3, a power management system 6 is arranged in the flameproof battery cavity 2, a switch assembly is arranged on the left side of the flameproof main cavity 3, an intrinsically safe wiring assembly is arranged on the right side of the flameproof main cavity 3, a flameproof wiring cavity 4 is arranged on the rear side of the flameproof main cavity 3, the electric control module, the power module, the power management system 6, the switch assembly and the intrinsically safe wiring assembly are all electrically connected to the central control module, a four-core multi-core flameproof through-wall terminal 8 is fixedly installed on the lower side of the flameproof main cavity 3, and a flameproof main cavity 3 is fixed on the upper left wall. A locking device 15 is installed, a cable introduction device 5 is fixedly installed on the lower part of the left side wall of the flameproof main cavity 3, an industrial control panel 16 is fixedly installed on the upper part of the front side of the flameproof main cavity 3, a control keyboard 10 is fixedly installed on the lower part of the front side of the flameproof main cavity 3, a plurality of quick installation mechanisms are arranged on the lower side of the flameproof main cavity 3, and a plurality of posture adjustment mechanisms are arranged on the lower side of the plurality of quick installation mechanisms. The electric control module includes: a programmable module group 17, an intrinsically safe power supply 20, an Ethernet switch 23 and an isolation safety barrier 27, the power supply module includes: a transformer 19, a switching power supply 21, a fuse module 22, a switch quantity isolation module 24 and a USB isolator 25, and the power management system 6 includes: a filter module group 18 and a relay module 26.

[0026] Among them, the intrinsically safe wiring assembly includes: an intrinsically safe wiring cavity 1, a nine-core wall terminal 7, a function knob 13, a waterproof joint 14, a double-layer wiring terminal 28 and a multi-core flameproof wall terminal 9. The intrinsically safe wiring cavity 1 is fixedly installed on the right side of the flameproof main cavity 3, the nine-core wall terminal 7 and the multi-core flameproof wall terminal 9 are fixedly installed on the left side of the intrinsically safe wiring cavity 1, the function knob 13 is fixedly installed on the front side of the intrinsically safe wiring cavity 1, and the waterproof joint 14 and the double-layer wiring terminal 28 are fixedly installed on the right side of the intrinsically safe wiring cavity 1.

[0027] The switch assembly includes: a combination switch 11 and an explosion-proof switch 12 . The combination switch 11 is fixedly installed at the upper left portion of the flameproof main cavity 3 , and the explosion-proof switch 12 is fixedly installed at the lower left portion of the flameproof main cavity 3 .

[0028] The quick installation mechanism includes: a sliding plate 29, a fixed plate 30, a bearing plate 31 and a locking assembly. The sliding plate 29 is fixedly installed on the lower side of the flameproof main cavity 3, the fixed plate 30 is slidably connected to the lower side of the sliding plate 29, the bearing plate 31 is fixedly installed on the lower side of the fixed plate 30, and the locking assembly is installed on the upper side of the bearing plate 31. The side wall of the sliding plate 29 is provided with a groove, the side wall of the fixed plate 30 is provided with an opening, and both ends of the sliding plate 29 are provided with inclined surfaces.

[0029] The flameproof main cavity 3 is moved, and the movement of the flameproof main cavity 3 drives the sliding plate 29 to move. The sliding plate 29 is slidably connected to the fixing plate 30 , so that the flameproof main cavity 3 can be quickly fixed on the fixing plate 30 .

[0030] The locking assembly includes: a fixed cavity 32, a sliding rod 33, a first spring 34 and a lever 35. The fixed cavity 32 is fixedly installed on the upper side of the supporting plate 31, the sliding rod 33 is slidably connected in the fixed cavity 32, the first spring 34 is arranged in the fixed cavity 32, one end of the first spring 34 is fixedly installed on the sliding rod 33, and the other end of the first spring 34 is fixedly installed on the fixed cavity 32. The lever 35 is rotatably connected to the upper side of the supporting plate 31 through a rotating shaft, one end of the lever 35 close to the sliding rod 33 is movably connected to the sliding rod 33, one end of the sliding rod 33 close to the fixed plate 30 passes through the opening of the fixed plate 30 and is tightly attached to the groove of the sliding plate 29, and the end of the sliding rod 33 close to the fixed plate 30 is provided with an inclined surface.

[0031] The lever 35 rotates to drive the sliding rod 33 to move away from the slot of the sliding plate 29. The sliding rod 33 leaves the slot of the sliding plate 29, which is conducive to the sliding plate 29 to quickly leave the locked state, move the flameproof main chamber 3, and the movement of the flameproof main chamber 3 drives the sliding plate 29 to move. The inclined surface of the sliding plate 29 is close to the inclined surface of the sliding rod 33. The movement of the sliding plate 29 makes the sliding rod 33 move away from the sliding plate 29. The first spring 34 is compressed, and the sliding rod 33 moves to the slot of the sliding plate 29. The compressed first spring 34 recovers and The sliding rod 33 is pushed to the groove of the sliding plate 29, which is conducive to quick locking after the explosion-proof main cavity 3 is installed; a buffer assembly is installed on the lower side of the bearing plate 31; the buffer assembly includes: an upper limiting strip 36, a lower limiting plate 37 and a second spring 38, the two upper limiting strips 36 are fixedly installed on the lower side of the bearing plate 31, the lower limiting plate 37 is slidably connected between the two upper limiting strips 36, one end of the second spring 38 is fixedly installed on the lower side of the bearing plate 31 through a bracket, and the other end of the second spring 38 is fixedly installed on the upper side of the lower limiting plate 37 through a bracket.

[0032] When the explosion-proof main cavity 3 receives the explosion impact force in the left and right directions, the explosion-proof main cavity 3 moves left and right, driving the sliding plate 29 to move left and right, the sliding plate 29 moves left and right, driving the fixed plate 30 to move left and right, and the fixed plate 30 moves left and right, driving the bearing plate 31 to move left and right, so that the second spring 38 undergoes elastic deformation, which is beneficial to absorb the explosion impact force and provide buffering to improve the explosion-proof effect.

[0033] The posture adjustment mechanism includes: a fixed bracket 39, a sliding foot 40, a worm wheel 41, a threaded rod 42, a worm 43, a rotating knob and a level ruler 44. The fixed bracket 39 is fixedly installed on the lower side of the lower limiting plate 37, the sliding foot 40 is slidably connected to the fixed bracket 39, the worm wheel 41 is rotationally connected to the lower limiting plate 37, the upper side of the threaded rod 42 is fixedly installed on the axis of the worm wheel 41, the lower side of the threaded rod 42 is threadedly connected to the sliding foot 40, the worm 43 is rotationally connected to the lower limiting plate 37 through a rotating shaft, the worm 43 and the worm wheel 41 are meshed with each other, the rotating knob is fixedly installed on the rotating shaft of the worm 43, and multiple level rulers 44 are fixedly installed on the side wall of the lower limiting plate 37.

[0034] Turning the knob drives the worm 43 to rotate, the worm 43 drives the worm wheel 41 to rotate, the worm wheel 41 drives the threaded rod 42 to rotate, and the threaded rod 42 rotates so that the sliding foot 40 can move up and down on the fixed bracket 39 to adjust the posture. Using multiple level rulers 44 to observe whether the overall level is conducive to quickly adjusting the horizontal posture and ensuring that the equipment body is in a horizontal state when installed.

[0035] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. The standard parts used can be purchased from the market, and special-shaped parts can be customized according to the records in the specification and drawings. The specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0036] The present invention is not limited to the above-mentioned implementation modes, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be considered as equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A flameproof and intrinsically safe programmable control box for mining, comprising a flameproof main cavity (3), characterized in that: An electric control module is arranged on the upper side of the flameproof main cavity (3), a power module is arranged on the middle side of the flameproof main cavity (3), a flameproof battery cavity (2) is fixedly installed on the lower side of the flameproof main cavity (3), a power management system (6) is arranged in the flameproof battery cavity (2), a switch assembly is arranged on the left side of the flameproof main cavity (3), an intrinsically safe wiring assembly is arranged on the right side of the flameproof main cavity (3), and a four-core or multi-core flameproof through-wall terminal (8) is fixedly installed on the lower side of the flameproof main cavity (3), A locking device (15) is fixedly installed on the upper part of the left side wall of the flameproof main cavity (3), a cable introduction device (5) is fixedly installed on the lower part of the left side wall of the flameproof main cavity (3), an industrial control panel (16) is fixedly installed on the upper part of the front side of the flameproof main cavity (3), a control keyboard (10) is fixedly installed on the lower part of the front side of the flameproof main cavity (3), and a plurality of quick installation mechanisms are provided on the lower side of the plurality of quick installation mechanisms, and a plurality of posture adjustment mechanisms are provided on the lower side of the plurality of quick installation mechanisms.

2. The flameproof and intrinsically safe programmable control box for mining according to claim 1 is characterized in that: The intrinsically safe wiring assembly comprises: an intrinsically safe wiring cavity (1), a nine-core through-wall terminal (7), a function knob (13), a waterproof joint (14), a double-layer wiring terminal (28) and a multi-core flameproof through-wall terminal (9); the intrinsically safe wiring cavity (1) is fixedly mounted on the right side of a flameproof main cavity (3); the nine-core through-wall terminal (7) and the multi-core flameproof through-wall terminal (9) are fixedly mounted on the left side of the intrinsically safe wiring cavity (1); the function knob (13) is fixedly mounted on the front side of the intrinsically safe wiring cavity (1); and the waterproof joint (14) and the double-layer wiring terminal (28) are fixedly mounted on the right side of the intrinsically safe wiring cavity (1).

3. The flameproof and intrinsically safe programmable control box for mining according to claim 2 is characterized in that: The switch assembly comprises: a combination switch (11) and an explosion-proof switch (12); the combination switch (11) is fixedly mounted on the upper left side of the flameproof main cavity (3); and the explosion-proof switch (12) is fixedly mounted on the lower left side of the flameproof main cavity (3).

4. The flameproof and intrinsically safe programmable control box for mining according to claim 3 is characterized in that: The quick installation mechanism comprises: a sliding plate (29), a fixed plate (30), a bearing plate (31) and a locking assembly, wherein the sliding plate (29) is fixedly installed on the lower side of the flameproof main cavity (3), the fixed plate (30) is slidably connected to the lower side of the sliding plate (29), the bearing plate (31) is fixedly installed on the lower side of the fixed plate (30), and the locking assembly is installed on the upper side of the bearing plate (31).

5. The flameproof and intrinsically safe programmable control box for mining according to claim 4 is characterized in that: The locking assembly comprises: a fixed cavity (32), a sliding rod (33), a first spring (34) and a lever (35); the fixed cavity (32) is fixedly mounted on the upper side of the bearing plate (31); the sliding rod (33) is slidably connected in the fixed cavity (32); the first spring (34) is arranged in the fixed cavity (32); one end of the first spring (34) is fixedly mounted on the sliding rod (33); the other end of the first spring (34) is fixedly mounted on the fixed cavity (32); the lever (35) is rotatably connected to the upper side of the bearing plate (31) via a rotating shaft; one end of the lever (35) close to the sliding rod (33) is movably connected to the sliding rod (33).

6. The flameproof and intrinsically safe programmable control box for mining according to claim 5 is characterized in that: A buffer assembly is installed on the lower side of the bearing plate (31).

7. The flameproof and intrinsically safe programmable control box for mining according to claim 6 is characterized in that: The buffer assembly comprises: an upper limiting strip (36), a lower limiting plate (37) and a second spring (38), wherein the two upper limiting strips (36) are fixedly mounted on the lower side of the bearing plate (31), the lower limiting plate (37) is slidably connected between the two upper limiting strips (36), one end of the second spring (38) is fixedly mounted on the lower side of the bearing plate (31) via a bracket, and the other end of the second spring (38) is fixedly mounted on the upper side of the lower limiting plate (37) via a bracket.

8. The flameproof and intrinsically safe programmable control box for mining according to claim 7 is characterized in that: The posture adjustment mechanism comprises: a fixed bracket (39), a sliding support foot (40), a worm wheel (41), a threaded rod (42), a worm (43), a rotating knob and a level ruler (44); the fixed bracket (39) is fixedly mounted on the lower side of the lower limiting plate (37); the sliding support foot (40) is slidably connected to the fixed bracket (39); the worm wheel (41) is rotationally connected to the lower limiting plate (37); the upper side of the threaded rod (42) is fixedly mounted on the axis of the worm wheel (41); the lower side of the threaded rod (42) is threadedly connected to the sliding support foot (40); the worm (43) is rotationally connected to the lower limiting plate (37) via a rotating shaft; the worm (43) and the worm wheel (41) are meshed with each other; the rotating knob is fixedly mounted on the rotating shaft of the worm (43); and a plurality of level rulers (44) are fixedly mounted on the side wall of the lower limiting plate (37).

Images