A marble surface flatness detection and measurement tool

Abstract

The invention discloses a marble surface flatness detection and measurement tool, which belongs to the field of flatness detection. It comprises a workbench, a material storage box is fixedly connected to the right side of the upper surface of the workbench, a piston tube is fixedly connected between the workbench and the material storage box, a piston rod is slidably connected inside the piston tube, a through-type transverse groove is provided on the front surface and the rear surface of the material storage box, the right ends of the two piston rods respectively penetrate into the inside of the two transverse grooves, and a push plate is fixedly connected together; a double-axis motor is fixedly connected to the left side of the material storage box; the double-axis motor is started, and under the cooperation of a reciprocating screw and a screw sleeve, the piston block can be controlled to move repeatedly inside the inflation box, and then the piston tube can be repeatedly inflated and evacuated through the air exchange pipe, and then the push plate can be controlled to move repeatedly left and right, so as to realize the automatic pushing effect of the marble plate and improve the marble detection efficiency.

Description

Technical Field

[0001] The invention relates to the field of flatness detection, and in particular to a marble surface flatness detection and measurement tool. Background Art

[0002] With the development of society and the continuous acceleration of urbanization, more and more marble is used in the construction process, such as in home decoration, park leisure construction and other fields, and its usage is increasing year by year. Marble tiles have won the favor of consumers with their realistic decorative effects and superior practical performance, and have developed into one of the mainstream products in the field of tiles.

[0003] In the production process of marble tiles, in order to ensure the quality of marble tiles, it is necessary to test the flatness of the marble surface;

[0004] Patent: Discloses a device for detecting the flatness of the surface of artificial marble, including an operating table, a telescopic rod is movably installed on the top of the operating table, a fixed plate is installed on the top of the telescopic rod, an electric push rod is installed on the top of the fixed plate, a mounting seat is movably sleeved on the surface of the fixed plate on one side of the electric push rod, a mounting plate is installed on the bottom end of the mounting seat, a fixed rod is installed on the bottom end of the mounting seat on one side of the mounting plate, a spring is installed on the bottom end of the mounting plate, a movable rod is installed on the bottom end of the spring, and the movable rod extends to the inside of the fixed rod. The device is simple in structure by installing a detection mechanism and a touch switch mechanism on the detection device, and the movable rod touches the touch switch mechanism to make the signal light flash. By installing a hydraulic rod at the bottom end of the operating table, it is convenient to place artificial marble, and installing a first slide groove can make the telescopic rod slide vertically, thereby increasing the range of movement of the detection wheel;

[0005] The above technology cannot facilitate the automatic detection of multiple marble assembly lines, and the detection efficiency is low. In addition, the above technology requires the use of a first slide groove to allow the telescopic rod to slide vertically and increase the range of movement of the detection wheel. It cannot perform multi-point simultaneous detection on the marble surface, and needs to be improved. For this reason, we propose a marble surface flatness detection and measurement tool. Summary of the invention

[0006] Purpose of the invention: The purpose of the present invention is to provide a detection device that is convenient for realizing automatic assembly line detection of multiple marbles and has high detection efficiency; another purpose of the present invention is to provide a device that can perform multi-point simultaneous detection on the marble surface.

[0007] Technical solution: A marble surface flatness detection and measurement tool, comprising a workbench, a material storage box is fixedly connected to the right side of the upper surface of the workbench, a piston tube is fixedly connected between the workbench and the material storage box, a piston rod is slidably connected inside the piston tube, a through transverse groove is opened on the front surface and the rear surface of the material storage box, the right ends of the two piston rods respectively penetrate into the inside of the two transverse grooves, and a push plate is fixedly connected to them together;

[0008] A double-axis motor is fixedly connected to the left side of the material storage box, and the two output shafts of the double-axis motor are slidably connected to reciprocating screws at opposite ends, and the outer wall of the reciprocating screw is threadedly connected to a screw sleeve, and the outer wall of the screw sleeve is fixedly connected to an inflation box, and the interior of the inflation box is slidably connected to a piston block, and the piston block is rotatably connected to the opposite end of the reciprocating screw through a rotating shaft, and a ventilation pipe 1 is fixedly connected between the inflation box and the piston tube;

[0009] A U-shaped frame is fixedly connected to the left side of the outer wall of the workbench, a detection alarm is fixedly connected to the upper surface of the U-shaped frame, a fixed plate is fixedly connected to the inner side of the U-shaped frame, a plurality of detection abutments are slidably connected to the inner front and inner rear of the fixed plate, a concave block is fixedly connected to the top of the detection abutment, a movable plate is commonly arranged on the inner sides of the plurality of concave blocks, both sides of the movable plate respectively pass through the two sides of the U-shaped frame and are fixedly connected to an L-shaped plate, a limit switch is fixedly connected to the inner side of the L-shaped plate, and the upper and lower surfaces of the movable plate located on the inner sides of the concave block are fixedly connected to wedge-shaped pressure blocks.

[0010] Furthermore, a limiting stop plate is fixedly connected to the inner right side of the material storage box.

[0011] Furthermore, a fixed block is fixedly connected to the left side of the material storage box, and the opposite sides of the two fixed blocks are rotatably connected to an axle rod through a rotating shaft, and the outer side wall of the axle rod is fixedly connected to a plurality of auxiliary transmission rollers, and the outer side wall of the axle rod and the outer side wall of the dual-axis motor are both fixedly connected to a transmission wheel, and the outer side walls of the two transmission wheels are commonly connected to a transmission belt.

[0012] Furthermore, a through slot is provided on the right side of the material storage box, and a lower support plate is fixedly connected to the right side of the push plate located on the inner side of the through slot.

[0013] Furthermore, a ventilation box 1 is fixedly connected to the rear surface of the material storage box, a piston plate 1 is slidably connected to the interior of the ventilation box 1, an upper push plate is fixedly connected to the upper surface of the piston plate 1, the top of the upper push plate passes through the top of the ventilation box 1, and a lower support plate 2 is provided, a recess is opened on the lower surface of the lower support plate 2, a plurality of cross bars are fixedly connected to the inner side of the upper push plate inside the recess, the cross bars are slidably connected to the upper push plate, a spring 1 is fixedly connected between the upper push plate and the recess, and on the outer sides of the plurality of cross bars.

[0014] Furthermore, a ventilation box 2 is fixedly connected to the front surface of the material storage box, a ventilation pipe 2 is fixedly connected between the ventilation box 2 and the ventilation box 1, a piston plate 2 is slidably connected to the interior of the ventilation box 2, a wedge-shaped resistance block is fixedly connected to the lower surface of the piston plate 2, the bottom of the wedge-shaped resistance block passes through the bottom of the ventilation box 2 and is slidably connected to the ventilation box 2, and a plurality of springs 4 are fixedly connected between the piston plate 2 and the wedge-shaped resistance block.

[0015] Furthermore, the front surface of the push plate is located on the right side of the wedge-shaped resistance block and is fixedly connected with an extrusion block.

[0016] Furthermore, the bottom end of the detection lever is fixedly connected with a concave rotating part, the bottom end of the concave rotating part is fixedly connected with a detection roller, the concave rotating part is on the opposite side of the fixed plate and is fixedly connected with a spring 2 located on the outer side of the detection lever, and a pad is provided on the upper surface of the workbench located on the inner side of the U-shaped frame, and the upper surface of the pad is in contact with the bottom of the detection roller.

[0017] Furthermore, two side plates are fixedly connected to the upper surface of the movable plate, and a spring three is fixedly connected between the side plates and the U-shaped frame.

[0018] Beneficial effect: Start the double-axis motor, and with the cooperation of the reciprocating screw and the screw sleeve, the piston block can be controlled to move repeatedly inside the air box, and then the air can be repeatedly inflated and exhausted into the piston tube through the air exchange pipe, and then the push plate can be controlled to move left and right repeatedly, so as to realize the automatic pushing effect of the marble plate and improve the marble detection efficiency;

[0019] When the double-axis motor is started, the auxiliary transmission roller will rotate together under the drive of the transmission wheel and the transmission belt, so as to assist the marble slab to be pushed from right to left, thus playing the role of assisting movement;

[0020] When the push plate moves to the left, the extrusion block will move to the left together, and the gas inside the second ventilation box will be filled into the first ventilation box through the contact with the wedge-shaped resistance block. At this time, the upper push plate will rise, and because the push plate moves to the left, the left side of the lower support plate 2 loses its obstruction. Under the push of the spring 1, the lower support plate 2 moves to the left, so that it can support the right side of the lower surface of the marble slab to be lowered. In combination with the lower support plate 1, the marble can be stably supported.

[0021] When the detection roller contacts the concave part of the marble surface, the concave block will be pulled down by the pressure of the second spring. At this time, the moving plate will be pressed backward by the wedge-shaped pressure block. At this time, the limit switch in front contacts the outer side of the U-shaped frame and opens, causing the detection alarm to sound an alarm.

[0022] When the detection roller contacts the raised part of the marble surface, the concave block rises and squeezes the movable plate forward through the wedge-shaped pressure block. At this time, the limit switch at the rear contacts the outer side of the U-shaped frame, causing the detection alarm to sound, thereby achieving the detection effect of the uneven marble surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the side view connection structure of the interior of the inflation box and the material storage box of the present invention;

[0025] Figure 3 It is a schematic diagram of the connection structure between the piston tube and the push plate of the present invention;

[0026] Figure 4 It is a schematic diagram of the internal connection structure of the ventilation box 1 and the ventilation box 2 of the present invention;

[0027] Figure 5 It is a schematic diagram of the cross-sectional connection structure of the lower support plate 2 and the upper push plate of the present invention;

[0028] Figure 6 It is a schematic diagram of the side view connection structure of the U-shaped frame, the fixed plate, the movable plate and the pad of the present invention;

[0029] Figure 7 It is a schematic diagram of the side view connection structure of the movable plate, the wedge-shaped pressure block, the side plate and the L-shaped plate of the present invention.

[0030] In the figure: 1. workbench; 2. material storage box; 3. piston tube; 4. piston rod; 5. transverse groove; 6. push plate; 7. double-axis motor; 8. reciprocating screw; 9. screw sleeve; 10. inflatable box; 11. piston block; 12. ventilation pipe 1; 13. U-shaped frame; 14. detection alarm; 15. fixed plate; 16. detection rod; 17. concave card block; 18. moving plate; 19. L-shaped plate; 20. limit switch; 21. wedge-shaped pressure block; 22. limit plate; 23. fixed block; 24. shaft rod; 25. Auxiliary transmission roller; 26, transmission wheel; 27, transmission belt; 28, through groove; 29, lower support plate one; 30, ventilation box one; 31, piston plate one; 32, upper push plate; 33, lower support plate two; 34, notch; 35, cross bar; 36, spring one; 37, ventilation box two; 38, ventilation pipe two; 39, piston plate two; 40, wedge-shaped resistance block; 41, extrusion block; 42, concave rotating part; 43, detection roller; 44, spring two; 45, pad; 46, side plate; 47, spring three; 48, spring four. DETAILED DESCRIPTION

[0031] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Example 1

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a marble surface flatness detection and measurement tool is provided, comprising a workbench 1, a material storage box 2 is fixedly connected to the right side of the upper surface of the workbench 1, a piston tube 3 is fixedly connected between the workbench 1 and the material storage box 2, a piston rod 4 is slidably connected inside the piston tube 3, a through transverse groove 5 is opened on the front surface and the rear surface of the material storage box 2, the right ends of the two piston rods 4 respectively penetrate into the inside of the two transverse grooves 5, and a push plate 6 is fixedly connected to both;

[0033] A double-axis motor 7 is fixedly connected to the left side of the storage box 2, and the two output shafts of the double-axis motor 7 are slidably connected to the reciprocating screw 8 at the opposite ends, and the outer wall of the reciprocating screw 8 is threadedly connected to the screw sleeve 9, and the outer wall of the screw sleeve 9 is fixedly connected to the inflation box 10, and the interior of the inflation box 10 is slidably connected to the piston block 11, and the piston block 11 is rotatably connected to the opposite end of the reciprocating screw 8 through a rotating shaft, and a ventilation pipe 12 is fixedly connected between the inflation box 10 and the piston tube 3;

[0034] Start the double-axis motor 7, and with the cooperation of the reciprocating screw 8 and the screw sleeve 9, the piston block 11 can be controlled to move repeatedly inside the inflation box 10, and then the piston tube 3 can be repeatedly inflated and exhausted through the air exchange pipe 12, and then the push plate 6 can be controlled to move left and right repeatedly, so as to realize the automatic pushing effect of the marble plate and improve the marble detection efficiency;

[0035] The right side of the interior of the storage box 2 is fixedly connected to a limit stop plate 22;

[0036] When the push plate 6 moves to the right to reset, it will move below the limit stop plate 22, and the marble can then drop down and contact the left side of the push plate 6;

[0037] A fixed block 23 is fixedly connected to the left side of the storage box 2, and the opposite sides of the two fixed blocks 23 are rotatably connected to a shaft 24 through a rotating shaft, and the outer side wall of the shaft 24 is fixedly connected to a plurality of auxiliary transmission rollers 25, and the outer side wall of the shaft 24 and the outer side wall of the double-axis motor 7 are both fixedly connected to a transmission wheel 26, and the outer side walls of the two transmission wheels 26 are commonly connected to a transmission belt 27;

[0038] When the dual-axis motor 7 is started, the auxiliary transmission roller 25 will rotate together with the transmission wheel 26 and the transmission belt 27, so as to assist the marble slab to be pushed from right to left, thus achieving the effect of assisting the movement;

[0039] A through slot 28 is provided on the right side of the storage box 2, and a lower support plate 29 is fixedly connected to the right side of the push plate 6, which is located inside the through slot 28;

[0040] After the push plate 6 moves to the left, it can be supported on the left side of the lower surface of the marble stacked later through the lower supporting plate 1 29 to prevent the marble from descending and blocking the push plate 6 from resetting to the right.

[0041] The rear surface of the storage box 2 is fixedly connected with a ventilation box 30, and a piston plate 31 is slidably connected inside the ventilation box 30. An upper push plate 32 is fixedly connected to the upper surface of the piston plate 31. The top of the upper push plate 32 penetrates to the top of the ventilation box 30, and a lower support plate 33 is provided. A recess 34 is provided on the lower surface of the lower support plate 33. A plurality of cross bars 35 are fixedly connected to the inner side of the upper push plate 32 in the recess 34. The cross bars 35 are slidably connected to the upper push plate 32. A spring 36 is fixedly connected between the upper push plate 32 and the recess 34, and on the outer sides of the plurality of cross bars 35.

[0042] A ventilation box 2 37 is fixedly connected to the front surface of the storage box 2, a ventilation pipe 2 38 is fixedly connected between the ventilation box 2 37 and the ventilation box 1 30, a piston plate 2 39 is slidably connected inside the ventilation box 2 37, a wedge-shaped abutment block 40 is fixedly connected to the lower surface of the piston plate 2 39, the bottom of the wedge-shaped abutment block 40 passes through the bottom of the ventilation box 2 37 and is slidably connected to the ventilation box 2 37, and a plurality of springs 48 are fixedly connected between the piston plate 2 39 and the wedge-shaped abutment block 40.

[0043] The front surface of the push plate 6 is located on the right side of the wedge-shaped abutment block 40 and is fixedly connected with an extrusion block 41;

[0044] When the push plate 6 moves to the left, the extrusion block 41 will move to the left together, and the gas inside the ventilation box 2 37 will be filled into the ventilation box 1 30 through the contact with the wedge-shaped abutment block 40. At this time, the upper push plate 32 will rise, and because the push plate 6 moves to the left, the left side of the lower support plate 2 33 loses its obstruction. Under the push of the spring 1 36, the lower support plate 2 33 moves to the left, so that it can support the right side of the lower surface of the marble slab to be lowered. In combination with the lower support plate 1 29, the marble can be stably supported.

[0045] When the push plate 6 moves to the right and resets, the wedge-shaped abutment block 40 loses its obstruction, and the ventilation box 37 draws out the internal gas of the ventilation box 30, causing the lower support plate 33 to descend. Moreover, when the push plate 6 moves to the right, it pushes the lower support plate 33 to move to the right, causing the lower support plate 33 to detach from under the marble. At this time, the marble can descend normally and contact the left side of the push plate 6, so that the push plate 6 can push the next marble out when it moves to the left.

[0046] like Figure 1 , Figure 6 and Figure 7 As shown, a U-shaped frame 13 is fixedly connected to the left side of the outer wall of the workbench 1, a detection alarm 14 is fixedly connected to the upper surface of the U-shaped frame 13, a fixed plate 15 is fixedly connected to the inner side of the U-shaped frame 13, a plurality of detection levers 16 are slidably connected to the inner front and inner rear of the fixed plate 15, a concave block 17 is fixedly connected to the top of the detection lever 16, a movable plate 18 is commonly arranged on the inner sides of the plurality of concave blocks 17, both sides of the movable plate 18 respectively pass through the two sides of the U-shaped frame 13, and are fixedly connected to an L-shaped plate 19, a limit switch 20 is fixedly connected to the inner side of the L-shaped plate 19, and the upper and lower surfaces of the movable plate 18 are located on the inner side of the concave block 17 and are fixedly connected to a wedge-shaped pressure block 21;

[0047] The bottom end of the detection lever 16 is fixedly connected with a concave rotating member 42, and the bottom end of the concave rotating member 42 is fixedly connected with a detection roller 43. The concave rotating member 42 is on the opposite side of the fixed plate 15, and a spring 2 44 is fixedly connected to the outside of the detection lever 16. The upper surface of the workbench 1 is located on the inner side of the U-shaped frame 13 and is provided with a pad 45. The upper surface of the pad 45 fits with the bottom of the detection roller 43.

[0048] The upper surface of the movable plate 18 is fixedly connected to two side plates 46, and a spring 3 47 is fixedly connected between the side plates 46 and the U-shaped frame 13;

[0049] Under normal conditions, the pad 45 is placed at the bottom of the plurality of detection rollers 43, and the limit switches 20 on the two L-shaped plates 19 are not squeezed, that is, the detection alarm 14 does not sound an alarm;

[0050] When the marble slab to be inspected is pushed, the pad 45 is gradually squeezed away from the bottom of the inspection roller 43 and contacts the bottom of the inspection roller 43;

[0051] When the detection roller 43 contacts the concave part of the marble surface, the spring 2 44 pushes the concave block 17 downward, and the wedge-shaped pressure block 21 pushes the moving plate 18 backward. At this time, the limit switch 20 in front contacts the outer side of the U-shaped frame 13 and opens, causing the detection alarm 14 to sound an alarm.

[0052] When the detection roller 43 contacts the raised part of the marble surface, the concave block 17 rises and squeezes the movable plate 18 forward through the wedge-shaped pressure block 21. At this time, the limit switch 20 at the rear contacts the outer side of the U-shaped frame 13, causing the detection alarm 14 to sound an alarm, thereby achieving the detection effect of the uneven marble surface.

[0053] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A marble surface flatness detection and measurement tool, comprising a workbench (1), characterized in that: A material storage box (2) is fixedly connected to the right side of the upper surface of the workbench (1), a piston tube (3) is fixedly connected between the workbench (1) and the material storage box (2), a piston rod (4) is slidably connected inside the piston tube (3), a through-type transverse groove (5) is provided on the front surface and the rear surface of the material storage box (2), the right ends of the two piston rods (4) respectively penetrate into the inside of the two transverse grooves (5), and are fixedly connected to a push plate (6) together; A double-shaft motor (7) is fixedly connected to the left side of the material storage box (2); two output shafts of the double-shaft motor (7) are slidably connected to reciprocating screws (8) at opposite ends; a screw sleeve (9) is threadedly connected to the outer wall of the reciprocating screw (8); an air-filling box (10) is fixedly connected to the outer wall of the screw sleeve (9); a piston block (11) is slidably connected to the inside of the air-filling box (10); the piston block (11) is rotatably connected to the opposite end of the reciprocating screw (8) via a rotating shaft; and a ventilation pipe (12) is fixedly connected between the air-filling box (10) and the piston tube (3); A U-shaped frame (13) is fixedly connected to the left side of the outer wall of the workbench (1), a detection alarm (14) is fixedly connected to the upper surface of the U-shaped frame (13), a fixed plate (15) is fixedly connected to the inner side of the U-shaped frame (13), a plurality of detection levers (16) are slidably connected to the inner front and inner rear of the fixed plate (15), a concave clamping block (17) is fixedly connected to the top of the detection lever (16), a movable plate (18) is commonly arranged on the inner sides of the plurality of concave clamping blocks (17), two sides of the movable plate (18) respectively pass through the two sides of the U-shaped frame (13) and are fixedly connected to an L-shaped plate (19), a limit switch (20) is fixedly connected to the inner side of the L-shaped plate (19), and the upper and lower surfaces of the movable plate (18) located on the inner side of the concave clamping block (17) are fixedly connected to a wedge-shaped pressure block (21).

2. A marble surface flatness detection and measurement tool according to claim 1, characterized in that: A limiting stop plate (22) is fixedly connected to the right side of the interior of the material storage box (2).

3. The marble surface flatness detection and measurement tool according to claim 1, characterized in that: A fixed block (23) is fixedly connected to the left side of the material storage box (2); opposite sides of the two fixed blocks (23) are rotatably connected to a shaft (24) via a rotating shaft; the outer side wall of the shaft (24) is fixedly connected to a plurality of auxiliary transmission rollers (25); the outer side wall of the shaft (24) and the outer side wall of the dual-axis motor (7) are both fixedly connected to a transmission wheel (26); and the outer side walls of the two transmission wheels (26) are commonly transmission-connected to a transmission belt (27).

4. The marble surface flatness detection and measurement tool according to claim 1, characterized in that: A through slot (28) is provided on the right side of the material storage box (2), and a lower support plate (29) is fixedly connected to the right side of the push plate (6) located inside the through slot (28).

5. The marble surface flatness detection and measurement tool according to claim 1, characterized in that: The rear surface of the material storage box (2) is fixedly connected to a ventilation box (30), and a piston plate (31) is slidably connected inside the ventilation box (30). An upper push plate (32) is fixedly connected to the upper surface of the piston plate (31). The top of the upper push plate (32) extends to the top of the ventilation box (30), and a lower support plate (33) is provided. A recess (34) is provided on the lower surface of the lower support plate (33). A plurality of cross bars (35) are fixedly connected to the inner side of the upper push plate (32) inside the recess (34). The cross bars (35) are slidably connected to the upper push plate (32), and a spring (36) is fixedly connected between the upper push plate (32) and the recess (34), and on the outer sides of the plurality of cross bars (35).

6. A marble surface flatness detection and measurement tool according to claim 5, characterized in that: The front surface of the material storage box (2) is fixedly connected to a ventilation box 2 (37), a ventilation pipe 2 (38) is fixedly connected between the ventilation box 2 (37) and the ventilation box 1 (30), a piston plate 2 (39) is slidably connected inside the ventilation box 2 (37), a wedge-shaped abutment block (40) is fixedly connected to the lower surface of the piston plate 2 (39), the bottom of the wedge-shaped abutment block (40) passes through the bottom of the ventilation box 2 (37) and is slidably connected to the ventilation box 2 (37), and a plurality of springs 4 (48) are fixedly connected between the piston plate 2 (39) and the wedge-shaped abutment block (40).

7. A marble surface flatness detection and measurement tool according to claim 6, characterized in that: The front surface of the push plate (6) is located to the right of the wedge-shaped abutment block (40) and is fixedly connected to a pressing block (41).

8. The marble surface flatness detection and measurement tool according to claim 1, characterized in that: The bottom end of the detection lever (16) is fixedly connected to a concave rotating member (42), the bottom end of the concave rotating member (42) is fixedly connected to a detection roller (43), a second spring (44) is fixedly connected to the opposite side of the concave rotating member (42) and the fixed plate (15) and located outside the detection lever (16), and the upper surface of the workbench (1) is located inside the U-shaped frame (13) and is provided with a pad (45), the upper surface of the pad (45) is in contact with the bottom of the detection roller (43).

9. The marble surface flatness detection and measurement tool according to claim 1, characterized in that: Two side plates (46) are fixedly connected to the upper surface of the movable plate (18), and a spring three (47) is fixedly connected between the side plates (46) and the U-shaped frame (13).

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