Commercial concrete energy-saving stirring machine easy to maintain

Abstract

The utility model relates to the technical field of stirrers, and provides an easy-to-maintain commercial concrete energy-saving stirrer which comprises a supporting plate, two supports are fixedly mounted on the rear side of the top end of the supporting plate, and a discharging box is fixedly mounted between the two supports; the maintenance mechanism is arranged at the left end of the supporting plate; the driving mechanism is arranged on the upper left portion of the supporting plate. The maintenance mechanism comprises a vertical rod, the vertical rod is fixedly installed at the left end of the supporting plate, a transition box is fixedly installed at the top end of the vertical rod, a valve is fixedly connected into the top end of the transition box in a sleeved mode, a lubricating liquid tank is fixedly installed at the top end of the valve, and a sealing plate is movably connected to the right side of the bottom end of the interior of the transition box in a sleeved mode. And a connecting rod is fixedly mounted at the top end of the sealing plate. Through the technical scheme, the problem of inconvenience in maintenance in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of mixers, and in particular to an energy-saving commercial concrete mixer which is easy to maintain. Background Art

[0002] Commercial concrete, also known as commercial concrete or ready-mixed concrete, is a concrete mixture that can be exchanged at equivalent value. It is composed of cementitious materials, aggregates (such as sand and gravel) and possible additives. It is mixed in a special mixing station in a predetermined proportion. It has good workability, is easy to construct and can be transported to the place of use in a short time, thereby speeding up the construction progress and ensuring the quality of the project.

[0003] In the process of using commercial concrete, a corresponding mixer is needed to complete the mixing operation, so that the commercial concrete can be mixed more evenly. However, the existing mixer is limited by structure and design. In actual use, the mixing drum is mainly driven by external gears to rotate. Since the gears are exposed to the air for a long time and lack corresponding maintenance mechanisms, operators need to perform manual maintenance on the gears regularly. Frequent manual maintenance not only increases the workload of operators, but also increases labor costs. Therefore, improvements are needed. Utility Model Content

[0004] The utility model provides a commercial concrete energy-saving mixer which is easy to maintain, and solves the problem of inconvenient maintenance in the related art.

[0005] The technical solution of the utility model is as follows: an easy-to-maintain commercial concrete energy-saving mixer, comprising:

[0006] A support plate, a bracket is fixedly installed on the rear side of the top end of the support plate, the number of the brackets is two, and a discharge box is fixedly installed between the two brackets;

[0007] A maintenance mechanism, wherein the maintenance mechanism is arranged at the left end of the support plate;

[0008] A driving mechanism, wherein the driving mechanism is arranged at the upper left of the support plate;

[0009] Wherein, the maintenance mechanism includes a vertical rod, which is fixedly installed on the left end of the support plate, and a transition box is fixedly installed on the top of the vertical rod. A valve is fixedly sleeved inside the top of the transition box, and a lubricating liquid tank is fixedly installed on the top of the valve. A sealing plate is movably sleeved on the right side of the bottom end of the transition box, and a connecting rod is fixedly installed on the top of the sealing plate. The top of the connecting rod penetrates the transition box and extends to the outside of the transition box, and a conduit is fixedly sleeved on the bottom of the right end of the transition box. The left end of the conduit is movably connected to the right end of the sealing plate, and the connecting rod will drive the sealing plate to move.

[0010] As a preferred technical solution of the utility model, the driving mechanism includes:

[0011] A driving motor, the driving motor is fixedly mounted on the rear side of the top end of the transition box, and the other end of the output shaft of the driving motor is fixedly sleeved with a driving shaft;

[0012] A rotating rod is fixedly sleeved on the right side of the outer surface of the driving shaft, a short rod is movably sleeved inside the rotating rod, and the right end of the short rod is fixedly connected to the top of the left end of the connecting rod.

[0013] As a preferred technical solution of the utility model, first vertical blocks are fixedly installed on the left and right sides of the bottom of the front end of the support plate, respectively, a first round rod is movably sleeved inside the first vertical block, a first round wheel is fixedly sleeved on the left side of the outer surface of the first round rod, the outer surface of the first round wheel is movably connected to the outer surface of the first vertical block, a driving gear is fixedly sleeved on the right side of the outer surface of the first round rod, the outer surface of the driving gear is movably connected to the outer surface of the first vertical block, and the right end of the outer surface of the first round rod is fixedly sleeved with a driven wheel located on the right side of the driving gear.

[0014] As a preferred technical solution of the utility model, a first motor is fixedly installed on the left side of the bottom end of the support plate, a rotating shaft is fixedly sleeved on the other end of the output shaft of the first motor, a driving wheel is fixedly sleeved on the right side of the outer surface of the rotating shaft, and the driving wheel is connected to the driven wheel through a transmission belt.

[0015] As a preferred technical solution of the utility model, second vertical blocks are fixedly installed on the front and rear ends of the left side of the top end of the support plate, respectively; a second round rod is movably sleeved inside the second vertical block; a second round wheel is fixedly sleeved on the front end of the outer surface of the second round rod; the outer surface of the second round wheel is movably connected to the outer surface of the second vertical block; a driven gear is fixedly sleeved on the rear end of the outer surface of the second round rod; and the outer surface of the driven gear is movably connected to the outer surface of the second vertical block.

[0016] As a preferred technical solution of the utility model, a circular ring is movably sleeved on the outer surface of the second circular wheel, the right side of the outer surface of the circular ring is movably sleeved on the outer surface of the first circular wheel, a mixing drum is fixedly sleeved on the inside of the circular ring, a connecting gear is fixedly sleeved on the rear side of the outer surface of the mixing drum, and the left and right sides of the outer surface of the connecting gear are respectively meshed and connected with the outer surfaces of the driving gear and the driven gear.

[0017] As a preferred technical solution of the utility model, fixed blocks are respectively fixedly installed on the left and right ends of the rear side of the bottom end of the support plate, a long rod is movably sleeved inside the fixed block, rollers are respectively fixedly sleeved on the left and right ends of the outer surface of the long rod, and the outer surface of the roller is movably connected to the outer surface of the fixed block.

[0018] As a preferred technical solution of the utility model, columns are fixedly installed on the left and right sides of the bottom end of the support plate, and the number of the columns is two. The bottom ends of the two columns are movably sleeved with extension rods, and the number of the extension rods is two. The top ends of the two extension rods are fixedly installed with cross bars, and the left and right ends of the cross bars are movably sleeved on the inner surfaces of the two columns.

[0019] As a preferred technical solution of the present utility model, a second motor is fixedly installed on the left side of the bottom end of the support plate, and a double-threaded rod is fixedly sleeved on the other end of the output shaft of the second motor. The top end of the double-threaded rod passes through the support plate and extends to the top of the support plate. Sliders are threadedly sleeved on the upper and lower sides of the outer surface of the double-threaded rod, and there are two slides. The two slides are movably sleeved on the inner surface of the left end of the support plate, and the rear ends of the two slides are respectively hinged with connecting rods. The other end of the connecting rod is hinged to the right end of the cross bar, and the slider will cause the cross bar to move.

[0020] The beneficial effects of the utility model are:

[0021] 1. The utility model is provided with a transition box, a sealing plate, a conduit, a driving motor and a rotating rod. When the driving motor is started, the driving shaft will drive the rotating rod to rotate. Since the inner surface of the rotating rod is movably sleeved with the short rod, the short rod will drive the connecting rod and the sealing plate to move upward along the inner surface of the transition box under the action of the rotating rod, thereby releasing the sealing plate from blocking the conduit, and then allowing the lubricating fluid inside the transition box to fall onto the outer surface of the connecting gear through the conduit, thereby realizing automatic maintenance of the connecting gear, thereby reducing the workload of the operator.

[0022] 2. The utility model is provided with an extension rod, a cross rod, a second motor, a slider and a connecting rod. When the second motor is started, the double-threaded rod will rotate. Since the outer surface of the double-threaded rod and the inner surface of the slider are threadedly sleeved, the two sliders will move the connecting rod in opposite directions under the action of the double-threaded rod, so that the other end of the connecting rod generates a pulling force on the cross rod, pulling the cross rod to move along the inner surface of the column with the extension rod, thereby realizing the adjustment of the height of the mixer discharge port, making it convenient for the operator to clean it. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Figure 2 It is a structural schematic diagram of the top of the utility model;

[0026] Figure 3 It is a cross-sectional structural schematic diagram of the vertical rod of the utility model;

[0027] Figure 4 It is a schematic cross-sectional structural diagram of the slider of the utility model;

[0028] Figure 5 It is a schematic cross-sectional view of the extension rod of the utility model;

[0029] Figure 6 for Figure 2 A schematic diagram of the local enlarged structure at point A in the middle;

[0030] Figure 7 for Figure 3 Schematic diagram of the local enlarged structure at point B in the middle.

[0031] In the figure: 1, support plate; 2, bracket; 3, discharge box; 4, maintenance mechanism; 401, vertical rod; 402, transition box; 403, valve; 404, lubricating liquid tank; 405, sealing plate; 406, connecting rod; 407, guide tube; 5, driving mechanism; 501, driving motor; 502, driving shaft; 503, rotating rod; 504, short rod; 6, first vertical block; 7, first round rod; 8, first round wheel; 9, driving gear; 10, from driving wheel; 11. first motor; 12. rotating shaft; 13. driving wheel; 14. transmission belt; 15. second vertical block; 16. second round rod; 17. second round wheel; 18. driven gear; 19. circular ring; 20. mixing drum; 21. connecting gear; 22. fixed block; 23. long rod; 24. roller; 25. column; 26. extension rod; 27. cross rod; 28. second motor; 29. ​​double threaded rod; 30. slider; 31. connecting rod. DETAILED DESCRIPTION

[0032] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figures 1 to 7 As shown, the utility model provides an easy-to-maintain commercial concrete energy-saving mixer, including:

[0034] A support plate 1, a bracket 2 is fixedly installed on the rear side of the top of the support plate 1, the number of the brackets 2 is two, and a discharge box 3 is fixedly installed between the two brackets 2;

[0035] A maintenance mechanism 4, which is arranged at the left end of the support plate 1;

[0036] The driving mechanism 5 is arranged at the upper left of the support plate 1;

[0037] Among them, the maintenance mechanism 4 includes a vertical rod 401, which is fixedly installed on the left end of the support plate 1, and a transition box 402 is fixedly installed on the top of the vertical rod 401. A valve 403 is fixedly sleeved inside the top of the transition box 402, and a lubricating liquid tank 404 is fixedly installed on the top of the valve 403. A sealing plate 405 is movably sleeved on the right side of the bottom end of the transition box 402, and a connecting rod 406 is fixedly installed on the top of the sealing plate 405. The top of the connecting rod 406 penetrates the transition box 402 and extends to the outside of the transition box 402. A conduit 407 is fixedly sleeved on the bottom of the right end of the transition box 402. The left end of the conduit 407 is movably connected to the right end of the sealing plate 405, and the connecting rod 406 will drive the sealing plate 405 to move.

[0038] When the connecting rod 406 moves upward, the sealing plate 405 fixedly connected to the connecting rod 406 will move along the inner surface of the transition box 402, thereby releasing the sealing barrier of the sealing plate 405 on the conduit 407. At this time, the operator opens the valve 403, and the lubricating liquid inside the lubricating liquid tank 404 will flow into the interior of the transition box 402. Since the conduit 407 is fixedly sleeved on the bottom of the right end of the transition box 402, the lubricating liquid inside the transition box 402 will flow out through the conduit 407, so that the mixer can be maintained, thereby improving the convenience and service life of the mixer.

[0039] Wherein, the driving mechanism 5 comprises:

[0040] The driving motor 501 is fixedly mounted on the rear side of the top of the transition box 402, and the other end of the output shaft of the driving motor 501 is fixedly sleeved with the driving shaft 502;

[0041] The rotating rod 503 is fixedly sleeved on the right side of the outer surface of the driving shaft 502 . A short rod 504 is movably sleeved inside the rotating rod 503 . The right end of the short rod 504 is fixedly connected to the top of the left end of the connecting rod 406 .

[0042] When the driving motor 501 is started, the driving shaft 502 drives the rotating rod 503 to rotate, so that the inner surface of the rotating rod 503 generates a thrust on the outer surface of the short rod 504, pushing the short rod 504 to move upward with the connecting rod 406.

[0043] Among them, the left and right sides of the bottom of the front end of the support plate 1 are respectively fixedly installed with the first vertical block 6, the first round rod 7 is movably sleeved inside the first vertical block 6, the left side of the outer surface of the first round rod 7 is fixedly sleeved with the first round wheel 8, the outer surface of the first round wheel 8 is movably connected to the outer surface of the first vertical block 6, the right side of the outer surface of the first round rod 7 is fixedly sleeved with a driving gear 9, the outer surface of the driving gear 9 is movably connected to the outer surface of the first vertical block 6, and the right end of the outer surface of the first round rod 7 is fixedly sleeved with a driven wheel 10 located on the right side of the driving gear 9.

[0044] When the driven wheel 10 rotates, it will drive the first round rod 7, the first round wheel 8 and the driving gear 9 to rotate together.

[0045] Among them, a first motor 11 is fixedly installed on the left side of the bottom end of the support plate 1, a rotating shaft 12 is fixedly sleeved on the other end of the output shaft of the first motor 11, a driving wheel 13 is fixedly sleeved on the right side of the outer surface of the rotating shaft 12, and the driving wheel 13 is connected to the driven wheel 10 through a transmission belt 14.

[0046] When the first motor 11 is started, the rotating shaft 12 drives the driving wheel 13 to rotate, thereby causing the driven wheel 10 to rotate through the transmission belt 14 .

[0047] Among them, the front and rear ends of the left side of the top of the support plate 1 are respectively fixedly installed with the second vertical block 15, the second round rod 16 is movably sleeved inside the second vertical block 15, the front end of the outer surface of the second round rod 16 is fixedly sleeved with a second round wheel 17, the outer surface of the second round wheel 17 is movably connected to the outer surface of the second vertical block 15, the rear end of the outer surface of the second round rod 16 is fixedly sleeved with a driven gear 18, and the outer surface of the driven gear 18 is movably connected to the outer surface of the second vertical block 15.

[0048] When the driven gear 18 rotates, the second round wheel 17 will be driven to rotate together through the second round rod 16 .

[0049] Among them, the outer surface of the second circular wheel 17 is movably sleeved with a circular ring 19, the right side of the outer surface of the circular ring 19 is movably sleeved with the outer surface of the first circular wheel 8, the inner part of the circular ring 19 is fixedly sleeved with a mixing drum 20, and the rear side of the outer surface of the mixing drum 20 is fixedly sleeved with a connecting gear 21, and the left and right sides of the outer surface of the connecting gear 21 are respectively meshed and connected with the outer surfaces of the driving gear 9 and the driven gear 18.

[0050] When the driving gear 9 rotates, the connecting gear 21 drives the mixing drum 20 to rotate, and the driven gear 18 also rotates under the action of the connecting gear 21 .

[0051] Among them, fixed blocks 22 are fixedly installed on the left and right ends of the rear side of the bottom end of the support plate 1, and a long rod 23 is movably sleeved inside the fixed block 22. Rollers 24 are fixedly sleeved on the left and right ends of the outer surface of the long rod 23, and the outer surface of the roller 24 is movably connected to the outer surface of the fixed block 22.

[0052] The presence of the rollers 24 facilitates the movement of the mixer.

[0053] Among them, columns 25 are fixedly installed on the left and right sides of the bottom end of the support plate 1, and the number of the columns 25 is two. The bottom ends of the two columns 25 are movably connected with extension rods 26, and the number of the extension rods 26 is two. The top ends of the two extension rods 26 are fixedly installed with cross bars 27, and the left and right ends of the cross bars 27 are movably connected to the inner surfaces of the two columns 25.

[0054] When the cross bar 27 moves, it will bring the extension bar 26 to move along the inner surface of the column 25 .

[0055] Among them, a second motor 28 is fixedly installed on the left side of the bottom end of the support plate 1, and a double-threaded rod 29 is fixedly sleeved on the other end of the output shaft of the second motor 28. The top end of the double-threaded rod 29 penetrates the support plate 1 and extends to the top of the support plate 1. Sliders 30 are threadedly sleeved on the upper and lower sides of the outer surface of the double-threaded rod 29. There are two slide blocks 30, and the two slide blocks 30 are movably sleeved on the inner surface of the left end of the support plate 1. The rear ends of the two slide blocks 30 are respectively hinged with connecting rods 31, and the other ends of the connecting rods 31 are hinged to the right end of the cross bar 27. The slide block 30 will move the cross bar 27.

[0056] When the second motor 28 is started, the double-threaded rod 29 will rotate, so that the two sliders 30 threadedly connected to the double-threaded rod 29 will move in opposite directions, and then the connecting rod 31 will generate a pulling force on the cross bar 27, pulling the cross bar 27 to move.

[0057] The working principle and use process of this utility model:

[0058] First, the operator starts the first motor 11, so that the rotating shaft 12 drives the driving wheel 13 to rotate. Since the driving wheel 13 and the driven wheel 10 are connected through the transmission belt 14, the driven wheel 10 will rotate along the inner surface of the first vertical block 6 with the first round rod 7, the first round wheel 8 and the driving gear 9, and the driving gear 9 is meshed with the connecting gear 21, so the connecting gear 21 will rotate with the mixing drum 20. Then the operator puts the commercial concrete into the mixing drum 20 through the discharge box 3 to mix it. When the connecting gear 21 needs to be maintained, During maintenance, the operator starts the drive motor 501, so that the drive shaft 502 drives the rotating rod 503 to rotate, so that the inner wall of the rotating rod 503 generates a thrust on the outer surface of the short rod 504, pushing the short rod 504 to move along the inner surface of the transition box 402 with the connecting rod 406 and the sealing plate 405. Then the operator opens the valve 403, so that the lubricating fluid inside the lubricating fluid tank 404 enters the transition box 402 and falls onto the outer surface of the connecting gear 21 through the conduit 407, so that the automatic maintenance of the connecting gear 21 can be realized, thereby reducing the workload of the operator.

[0059] When cleaning the mixer, the operator starts the second motor 28 to rotate the double-threaded rod 29. At this time, the two sliders 30 threadedly connected to the double-threaded rod 29 will move in opposite directions. Because the sliders 30 and the connecting rods 31 are hinged, the connecting rods 31 will generate a pulling force on the cross bar 27 as the sliders 30 move, pulling the cross bar 27 and the extension rods 26 to move upward along the inner surface of the column 25, so that the height of the mixer discharge port can be adjusted, which is convenient for the operator to clean.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An easy-to-maintain commercial concrete energy-saving mixer, characterized in that: Included are: A support plate (1), a bracket (2) is fixedly mounted on the rear side of the top end of the support plate (1), the number of the brackets (2) is two, and a material discharge box (3) is fixedly mounted between the two brackets (2); A maintenance mechanism (4), wherein the maintenance mechanism (4) is arranged at the left end of the support plate (1); A driving mechanism (5), wherein the driving mechanism (5) is arranged on the upper left side of the support plate (1); The maintenance mechanism (4) comprises a vertical rod (401), wherein the vertical rod (401) is fixedly mounted on the left end of the support plate (1), a transition box (402) is fixedly mounted on the top of the vertical rod (401), a valve (403) is fixedly sleeved inside the top of the transition box (402), a lubricating liquid tank (404) is fixedly mounted on the top of the valve (403), a sealing plate (405) is movably sleeved on the right side of the bottom end of the transition box (402), a connecting rod (406) is fixedly mounted on the top of the sealing plate (405), the top of the connecting rod (406) penetrates the transition box (402) and extends to the outside of the transition box (402), a conduit (407) is fixedly sleeved on the bottom of the right end of the transition box (402), the left end of the conduit (407) is movably connected to the right end of the sealing plate (405), and the connecting rod (406) drives the sealing plate (405) to move.

2. The easy-to-maintain commercial concrete energy-saving mixer according to claim 1 is characterized in that: The driving mechanism (5) comprises: A driving motor (501), the driving motor (501) being fixedly mounted on the rear side of the top end of the transition box (402), and the other end of the output shaft of the driving motor (501) being fixedly sleeved with the driving shaft (502); A rotating rod (503) is fixedly sleeved on the right side of the outer surface of the driving shaft (502), a short rod (504) is movably sleeved inside the rotating rod (503), and the right end of the short rod (504) is fixedly connected to the top of the left end of the connecting rod (406).

3. The easy-to-maintain commercial concrete energy-saving mixer according to claim 1 is characterized in that: A first vertical block (6) is fixedly mounted on the left and right sides of the bottom of the front end of the support plate (1), a first round rod (7) is movably sleeved inside the first vertical block (6), a first round wheel (8) is fixedly sleeved on the left side of the outer surface of the first round rod (7), the outer surface of the first round wheel (8) is movably connected to the outer surface of the first vertical block (6), a driving gear (9) is fixedly sleeved on the right side of the outer surface of the first round rod (7), the outer surface of the driving gear (9) is movably connected to the outer surface of the first vertical block (6), and a driven wheel (10) located on the right side of the driving gear (9) is fixedly sleeved on the right end of the outer surface of the first round rod (7).

4. The easy-to-maintain commercial concrete energy-saving mixer according to claim 1 is characterized in that: A first motor (11) is fixedly mounted on the left side of the bottom end of the support plate (1); a rotating shaft (12) is fixedly sleeved on the other end of the output shaft of the first motor (11); a driving wheel (13) is fixedly sleeved on the right side of the outer surface of the rotating shaft (12); and the driving wheel (13) is transmission-connected to the driven wheel (10) via a transmission belt (14).

5. The easy-to-maintain commercial concrete energy-saving mixer according to claim 1 is characterized in that: A second vertical block (15) is fixedly mounted at the front and rear ends of the left side of the top end of the support plate (1), a second round rod (16) is movably sleeved inside the second vertical block (15), a second round wheel (17) is fixedly sleeved at the front end of the outer surface of the second round rod (16), the outer surface of the second round wheel (17) is movably connected to the outer surface of the second vertical block (15), a driven gear (18) is fixedly sleeved at the rear end of the outer surface of the second round rod (16), and the outer surface of the driven gear (18) is movably connected to the outer surface of the second vertical block (15).

6. The easy-to-maintain commercial concrete energy-saving mixer according to claim 5, characterized in that: A circular ring (19) is movably sleeved on the outer surface of the second circular wheel (17); the right side of the outer surface of the circular ring (19) is movably sleeved on the outer surface of the first circular wheel (8); a mixing drum (20) is fixedly sleeved inside the circular ring (19); a connecting gear (21) is fixedly sleeved on the rear side of the outer surface of the mixing drum (20); and the left and right sides of the outer surface of the connecting gear (21) are respectively meshed and connected with the outer surfaces of the driving gear (9) and the driven gear (18).

7. The easy-to-maintain commercial concrete energy-saving mixer according to claim 1, characterized in that: A fixing block (22) is fixedly mounted on the left and right ends of the rear side of the bottom end of the support plate (1), a long rod (23) is movably sleeved inside the fixing block (22), and rollers (24) are fixedly sleeved on the left and right ends of the outer surface of the long rod (23), respectively, and the outer surface of the roller (24) is movably connected to the outer surface of the fixing block (22).

8. The easy-to-maintain commercial concrete energy-saving mixer according to claim 1, characterized in that: The left and right sides of the bottom end of the support plate (1) are respectively fixedly mounted with upright posts (25), the number of the upright posts (25) being two, the bottom ends of the two upright posts (25) being movably sleeved with extension rods (26), the number of the extension rods (26) being two, the top ends of the two extension rods (26) being respectively fixedly mounted with cross bars (27), the left and right ends of the cross bars (27) being respectively movably sleeved on the inner surfaces of the two upright posts (25).

9. The easy-to-maintain commercial concrete energy-saving mixer according to claim 1, characterized in that: A second motor (28) is fixedly mounted on the left side of the bottom end of the support plate (1); a double-threaded rod (29) is fixedly sleeved on the other end of the output shaft of the second motor (28); the top end of the double-threaded rod (29) penetrates the support plate (1) and extends to the top end of the support plate (1); sliders (30) are respectively threadedly sleeved on the upper and lower sides of the outer surface of the double-threaded rod (29); the number of the sliders (30) is two; the two sliders (30) are respectively movably sleeved on the inner surface of the left end of the support plate (1); the rear ends of the two sliders (30) are respectively hinged with connecting rods (31); the other ends of the connecting rods (31) are hinged to the right end of the cross bar (27); the sliders (30) will cause the cross bar (27) to move.

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