CN115535636A - High volume fly ash wall material stacking anti-tilt device - Google Patents

Abstract

The invention relates to the technical field of stacking anti-tilting devices, in particular to a stacking anti-tilting device for high-volume fly ash wall materials, which comprises a bearing seat and protection plates, wherein the protection plates are movably arranged around the middle part of the upper surface of the bearing seat; the top ends of the four protection plates are movably connected with partition plates, and a position adjusting device is arranged on one side of the periphery of the adjacent partition plate and the protection plate and used for a position angle adjusting mechanism of the partition plate on the protection plate; the cage protection can be implemented on the bearing seat through the four protection plates movably arranged on the bearing seat, the bearing seat is rotated through the servo motor driving screw, so that each protection plate can quantitatively adjust displacement on the bearing seat, and then the effective anti-tilt protection is implemented on different arrangement amounts of the high-volume fly ash wall materials when the wall materials are stacked, and the aim of conveniently arranging the high-volume fly ash wall materials of various specifications and sizes in a stacking and anti-tilt manner is fulfilled.

Description

A stacking and anti-tilting device for high-volume fly ash wall materials

technical field

The invention relates to the technical field of stacking anti-tilt devices, in particular to an anti-tilt device for stacking high-volume fly ash wall materials.

Background technique

The high-volume fly ash wall material mainly replaces clay bricks and is used on partition walls, non-load-bearing walls and some walls that do not require high mechanical properties. It not only has low energy consumption, uses waste materials, reduces pollution, and is convenient and economical to construct. Good benefits and other advantages, and it is superior to other wall materials in terms of thermal insulation and sound insulation. When the user stacks the produced high-volume fly ash wall materials, he needs to use anti-tilt devices to protect them. However, most of the anti-tilt devices in the prior art use wooden boards for load-bearing. There are still the following deficiencies:

When the anti-tilt device in the prior art is stacking high-volume fly ash wall materials, due to its structural defects, it is difficult to implement anti-tilt protection for high-volume fly ash wall materials with different placement quantities, so it is difficult to meet various requirements. Stacking and anti-tilting requirements for high-volume fly ash wall materials of various sizes.

Contents of the invention

In view of this, the object of the present invention is to propose an anti-tilt device for stacking high-volume fly ash wall materials to solve the problem of implementing anti-tilt protection for high-volume fly ash wall materials with different placement volumes, so that it is difficult to meet multiple requirements. The anti-tilt requirements of stacking high-volume fly ash wall materials of various specifications and sizes.

Based on the above purpose, the present invention provides an anti-tilt device for stacking high-volume fly ash wall materials, including: a bearing seat and a protective plate, and protective plates are movable around the middle part of the upper surface of the bearing seat, and four protective plates Arranged in a mouth-shaped position;

A servo motor is provided at the inner middle part of the protective plate close to the bottom end, the power output end of the servo motor is fixedly connected with a screw, and one end of the outer periphery of the screw runs through the protective plate and is threadedly inserted into the bearing seat;

The tops of the four protective plates are movably connected with partitions, and the adjacent partitions and the peripheral side of the protective plates are provided with a position adjustment device, and the position adjustment device is used for the position angle adjustment mechanism of the partitions on the protective plates.

Preferably, the bearing seat further includes: a power supply device, the power supply equipment is fixedly connected around the middle part of the lower surface of the bearing seat, a storage groove is opened in the middle part of the outer front of the bearing seat, and the bottom end of the middle part of one side of the inner wall of the storage groove is Fixed connection with controller.

Preferably, the bearing seat further includes: an accommodating groove, the middle part of the upper surface of the bearing seat is provided with an accommodating groove, the accommodating groove has a regular quadrilateral structure, and the surrounding edges of the middle part of the lower surface of the accommodating groove are provided with A chute, the peripheral bottom end of the protective plate runs through the accommodating groove and is slidably inserted into the chute, and the accommodating groove and the chute are used for a movement limiting mechanism of the protective plate in the bearing seat.

Preferably, the bearing seat further includes: a limiting groove, and a limiting groove is opened in the middle of the inner wall of the accommodating groove, and the limiting groove is used for positioning when the peripheral side of the protective plate is attached to the inner wall of the accommodating groove In the mechanism, a thread groove is provided in the middle of one side of the inner wall of the limiting groove, and the outer periphery of the screw rod passes through the limiting groove and is threadedly inserted into the thread groove.

Preferably, the position adjustment device further includes: a hollow iron block, a hollow iron block is fixedly connected to the top end of the middle part on one side of the periphery of the partition, and a mounting seat is fixedly connected to the top end of the middle part of the peripheral side of the protective plate, and the mounting seat The middle part is threadedly connected with a threaded rod, and the top end of the threaded rod is rotatably connected with an adjustment block through a bearing. An electromagnet is embedded in the side of the adjustment block close to the hollow iron block, and the electromagnet is used for adjusting the block and the hollow iron block. Positioning mechanism between.

Preferably, the bottom end of the threaded rod runs through the mounting seat and is fixedly connected with a turntable, the hollow iron block has a triangular prism structure, the adjustment block has a pentagonal prism structure, and the peripheral side of the adjustment block is in close contact with the hollow iron block. and slide together.

Preferably, a pad is provided on the other side of the partition and the other side of the protective plate, and memory foam is provided inside the pad.

Preferably, the bearing seat further includes: a connecting seat, the bottom ends of both sides of the outer periphery of the bearing seat are provided with connecting seats near the edges of both ends, and one end of the connecting seat is connected to a supporting seat through a rotating shaft, and the supporting seat One end of the lower surface is provided with a hemisphere, and the hemisphere is located under the bearing seat;

A servo motor is arranged inside the support seat close to one end, the power output end of the servo motor is fixedly connected with a screw rod through the support seat, the outer thread of the screw rod is sleeved with a threaded sleeve, and the top end of the screw rod is fixedly connected with a limit Block, the limit block is used for the limit mechanism of the threaded sleeve moving around the screw rod, the middle part of the peripheral side of the threaded sleeve is fixedly connected with a universal joint, and one end of the universal joint is fixedly connected with a fixed seat. The bottom end of the fixed seat is fixedly connected with the bearing seat;

Infrared sensors are embedded near the four corners of the lower surface of the bearing seat, and the infrared sensors are used to detect the distance mechanism between the four corners of the lower surface of the bearing seat and the bottom surface.

Beneficial effects of the present invention: the high-volume fly ash wall material on the bearing base can be shrouded and protected through the four protective plates movable on the bearing base, and the screw is driven by the servo motor to rotate on the bearing base, thereby The displacement of each protective plate can be adjusted quantitatively on the bearing seat, so as to effectively implement anti-tilt protection for high-volume fly ash wall materials with different placement volumes when stacking, and achieve the convenience of placing high-volume fly ash wall materials of various specifications and sizes. The stacking anti-tilt purpose of coal ash wall materials.

The position adjustment device can effectively control and adjust the swing angle of the position of the partition on the protective plate, so as to realize the protection of the high-volume fly ash wall material stacked on the top and also play an anti-tilt effect, further improving It ensures the safety of stacking high-volume fly ash wall materials.

Description of drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description are only the present invention. Invention, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative work.

Fig. 1 is a schematic diagram of the overall half-section structure of the present invention;

Fig. 2 is a schematic diagram of the front half-section structure of the bearing seat of the present invention;

Figure 3 is a schematic diagram of the enlarged structure at A in Figure 2;

Fig. 4 is a schematic diagram of a half-section structure of a protective plate of the present invention;

Fig. 5 is a schematic diagram of the front view structure of the present invention.

The marks in the figure are: 1. Bearing seat; 11. Power supply equipment; 12. Accommodating groove; 13. Slide groove; 14. Limiting groove; 15. Thread groove; 2. Connecting seat; 21. Supporting seat; 22. Hemisphere body; 23, servo motor; 24, screw rod; 25, threaded sleeve; 26, limit block; 27, universal joint; 28, fixed seat; 29, infrared sensor; 3, protective plate; 31, servo motor; 32 , screw rod; 4, clapboard; 41, protective pad; 42, hollow iron block; 43, mounting seat; 44, threaded rod; 45, turntable; 46, adjustment block; 47, electromagnet; 5, storage slot; 51, controller.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific examples.

It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by those skilled in the art to which the present invention belongs. "First", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "Down", "Left", "Right" and so on are only used to indicate the relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

Embodiment one:

As shown in Figure 1, Figure 2 and Figure 5, an anti-tilt device for stacking high-volume fly ash wall materials includes: a bearing seat 1 and a protective plate 3, and the middle part of the upper surface of the bearing seat 1 is movable around Protective plate 3, four protective plates 3 are arranged in the shape of a square.

Wherein, the high-volume fly ash wall material on the bearing base 1 can be shrouded and protected through the four protective plates 3 movably provided on the bearing base 1 .

A servo motor 31 is provided at the inner middle part of the protective plate 3 close to the bottom end, and the power output end of the servo motor 31 is fixedly connected with a screw 32 by bolts, and one end of the outer periphery of the screw 32 penetrates the protective plate 3 and is screwed into the bearing seat 1 .

Among them, the servo motor 31 drives the screw 32 to rotate on the bearing seat 1, so that each protective plate 3 can quantitatively adjust the displacement on the bearing seat 1, and then effectively adjust the high-volume fly ash wall materials with different placements. Anti-tilt protection is implemented during stacking, which achieves the purpose of stacking protection for convenient placement of high-volume fly ash wall materials of various specifications and sizes.

The tops of the four protective plates 3 are movably connected with partitions 4, and the adjacent partitions 4 and the peripheral side of the protective plates 3 are provided with a position adjustment device, and the position adjustment device is used for the partition 4 on the protective plate 3 position angle adjustment mechanism.

Among them, the position adjustment device can effectively control and adjust the swing angle of the position of the partition plate 4 on the protective plate 3, so as to realize the protection of the high-volume fly ash wall material stacked on the top and also play an anti-tilt role. As a result, the safety of high-volume fly ash wall materials is further improved.

The bearing base 1 also includes: a power supply device 11, the middle part of the lower surface of the bearing base 1 is fixedly connected with the power supply equipment 11 by bolts, the outer middle part of the bearing base 1 is provided with a storage groove 5, and the storage groove 5 A controller 51 is fixedly connected to the bottom end of the middle part on one side of the inner wall by bolts, and the controller 51 is convenient for users to control and use.

The bearing seat 1 also includes: an accommodating groove 12, the middle part of the upper surface of the bearing seat 1 is provided with an accommodating groove 12, the accommodating groove 12 has a regular quadrilateral structure, and the surrounding edges of the middle part of the lower surface of the accommodating groove 12 are Both are provided with chute 13, and the peripheral bottom end of the protective plate 3 runs through the accommodating groove 12 and slides into the chute 13, and the accommodating groove 12 and the chute 13 are used for the movement of the protective plate 3 in the bearing seat 1 limit mechanism.

Among them, through the accommodating groove 12 and the sliding groove 13 provided on the bearing seat 1, the moving position of each protective plate 3 can be positioned, thereby effectively improving the stability and protective strength of the protective plate 3 during movement adjustment. .

The bearing seat 1 also includes: a limiting groove 14, and the middle part of the inner wall of the accommodation groove 12 is provided with a limiting groove 14, and the limiting groove 14 is used to fit the peripheral side of the protective plate 3 to the accommodation groove 12 As for the positioning mechanism on the inner wall, a threaded groove 15 is opened in the middle of one side of the inner wall of the limiting groove 14 , and the outer periphery of the screw rod 32 runs through the limiting groove 14 and is threadedly inserted into the threaded groove 15 .

Among them, the limiting groove 14 provided in the accommodating groove 12 can play a positioning effect on the protective plate 3 when it is displaced and fitted to the inner wall of the accommodating groove 12, further realizing the placement of high-volume fly ash walls in the largest range. While improving the material capacity, the protective strength is improved, and the effect of the directional movement of the protective plate 3 in the accommodating groove 12 can be adjusted with the help of the screw groove 15 with the screw rod 32 .

Embodiment two:

As shown in Fig. 1, Fig. 2 and Fig. 4, a high-volume fly ash wall material stacking anti-tilt device includes: a bearing seat 1 and a protective plate 3, and the middle part of the upper surface of the bearing seat 1 is movably provided with The protective plate 3, the four protective plates 3 are arranged in a mouth-shaped position, the inner middle of the protective plate 3 is provided with a servo motor 31 near the bottom end, and the power output end of the servo motor 31 is fixedly connected with a screw rod 32 by bolts, One end of the outer periphery of the screw rod 32 passes through the protective plate 3 and is threadedly inserted into the bearing seat 1 .

The position adjusting device also includes: a hollow iron block 42, the top end of the middle part of the outer side of the partition 4 is fixedly connected with the hollow iron block 42 by bolts, and the top end of the middle part of the outer side of the protective plate 3 is fixedly connected with a mounting seat by bolts 43, the middle part of the mounting seat 43 is threadedly inserted with a threaded rod 44, and the top of the threaded rod 44 is rotatably sleeved with an adjustment block 46 through a bearing, and an electromagnet 47 is embedded in the side of the adjustment block 46 close to the hollow iron block 42 , the electromagnet 47 is used to adjust the position positioning mechanism between the block 46 and the hollow iron block 42 .

Wherein, by turning the threaded rod 44, the adjustment block 46 can slide and press the hollow iron block 42 with the help of the thrust of the threaded rod 44, so that the partition plate 4 can be oscillatingly adjusted above the protective plate 3, so as to realize the adjustment on the bearing seat. 1 The high-volume fly ash wall material in the middle of the upper surface is protected, and at the same time it can also play the role of anti-tilt protection, which further improves the stability of the center of gravity of the high-volume fly ash wall material when it is placed and stacked. The electromagnet 47 provided on the block 46 can adsorb the hollow iron block 42 on the partition plate 4, thereby effectively limiting the effect of adjusting the swing position of the partition plate 4, facilitating the adjustment of the overall center of gravity position, and further achieving The purpose of anti-rolling.

The bottom end of the threaded rod 44 runs through the mounting seat 43 and is fixedly connected with a turntable 45 by bolts. The hollow iron block 42 is in a triangular prism structure, and the adjustment block 46 is in a pentagonal prism structure. One side of the periphery of the adjustment block 46 is Fitted and slid with the hollow iron block 42 , the other side of the partition 4 and the other side of the protective plate 3 are provided with a protective pad 41 , and memory foam is arranged inside the protective pad 41 .

Wherein, it is convenient for the user to rotate the threaded rod 44 through the turntable 45, and then it is convenient to control the movable position of the adjustment block 46, and the protective pad 41 and the memory foam provided on the periphery of the protective plate 3 and the partition plate 4 can protect the top of the bearing seat 1. The effect of placing high-volume fly ash wall materials.

Embodiment three:

As shown in Fig. 1, Fig. 2 and Fig. 3, a high-volume fly ash wall material stacking anti-tilt device includes: a bearing seat 1 and a protective plate 3, and the middle part of the upper surface of the bearing seat 1 is movably provided with The protective plate 3, the four protective plates 3 are arranged in a mouth-shaped position, the inner middle of the protective plate 3 is provided with a servo motor 31 near the bottom end, and the power output end of the servo motor 31 is fixedly connected with a screw rod 32 by bolts, One end of the outer periphery of the screw rod 32 passes through the protective plate 3 and is threadedly inserted into the bearing seat 1 .

The bearing base 1 also includes: a connecting base 2, the bottom ends of both sides of the bearing base 1 are provided with connecting bases 2 close to the edges of both ends, and one end of the connecting base 2 is connected to a supporting base 21 through a rotating shaft. A hemispherical body 22 is provided at one end of the lower surface of the support seat 21 , and the hemispherical body 22 is located below the bearing seat 1 .

A servo motor 23 is arranged inside the support base 21 close to one end, and the power output end of the servo motor 23 penetrates the support base 21 and is fixedly connected with a screw rod 24 by bolts, and a screw sleeve 25 is threaded on the periphery of the screw rod 24 . The top of the screw rod 24 is fixedly connected to the limit block 26 by bolts, and the limit block 26 is used as a limit mechanism for the movement of the threaded sleeve 25 on the periphery of the screw rod 24, and the middle part of the peripheral side of the threaded sleeve 25 is fixedly connected by bolts. There is a universal joint 27, one end of the universal joint 27 is fixedly connected with a fixed seat 28 by bolts, and the bottom end of the fixed seat 28 is fixedly connected with the bearing seat 1 by bolts.

Wherein, the screw rod 24 is driven by the servo motor 23, so that the threaded sleeve 25 can move up and down on the periphery of the screw rod 24 through the connection between the fixed seat 28 and the universal joint 27, thereby effectively adjusting the distance between the hemisphere 22 and the bearing seat 1. The swing angle between them can realize the adjustment of the placement position of the bearing seat 1, so that when the high-volume fly ash wall material is stacked on the bearing seat 1, when it is tilted, the balance adjustment can be realized through the detection effect of the infrared sensor 29, and then effectively It prevents the dumping of high-volume fly ash wall materials due to unstable stacking and placement.

Infrared sensors 29 are embedded near the four corners of the lower surface of the bearing base 1 , and the infrared sensors 29 are used to detect the distance between the four corners of the lower surface of the bearing base 1 and the bottom surface.

Wherein, the bearing base 1 can be lifted on the ground through the hemisphere 22 provided under the supporting base 21, so that each infrared sensor 29 can detect the position between the four corners below the bearing base 1 and the ground, Furthermore, the stable effect of real-time detection of the horizontal position of the bearing seat 1 is achieved.

Working principle: when in use, by turning the threaded rod 44, the adjustment block 46 can slide and press the hollow iron block 42 with the help of the thrust of the threaded rod 44, so that the partition 4 can be adjusted to swing above the protective plate 3, realizing the The high-volume fly ash wall material placed in the middle of the upper surface of the bearing seat 1 is used for protection, and at the same time, it can also play the role of anti-tilt protection, further improving the stability of the center of gravity of the high-volume fly ash wall material when it is placed and stacked , through the electromagnet 47 provided on the adjustment block 46, the hollow iron block 42 on the partition 4 can be adsorbed, so that the effect of adjusting the swing position of the partition 4 can be effectively limited, and the overall center of gravity position can be adjusted conveniently. , to further achieve the purpose of anti-tilting, the screw rod 24 is driven by the servo motor 23, so that the threaded sleeve 25 can move up and down on the periphery of the screw rod 24 through the connection between the fixed seat 28 and the universal joint 27, thereby effectively adjusting the hemisphere The swing angle between the body 22 and the bearing base 1 realizes the adjustment of the placement position of the bearing base 1, so that the high-volume fly ash wall material can pass the detection effect of the infrared sensor 29 when it is tilted when stacked on the bearing base 1 The balance adjustment is realized, thereby effectively preventing the dumping of the high-volume fly ash wall material caused by the unstable stacking position.

Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is exemplary only, and is not intended to imply that the scope of the present invention (including claims) is limited to these examples; under the idea of the present invention, the above embodiments or Combinations between technical features in different embodiments are also possible, steps may be carried out in any order, and there are many other variations of the different aspects of the invention as described above, which are not presented in detail for the sake of brevity.

The present invention is intended to embrace all such alternatives, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent replacements, improvements, etc. within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. A high-volume fly ash wall material stacking anti-tilting device comprises: the protective device comprises a bearing seat (1) and protective plates (3), wherein the protective plates (3) are movably arranged around the middle part of the upper surface of the bearing seat (1), and the four protective plates (3) are arranged in a square shape;

the protection device is characterized in that a servo motor (31) is arranged in the middle of the inner side of the protection plate (3) and close to the bottom end, a power output end of the servo motor (31) is fixedly connected with a screw rod (32), and one end of the periphery of the screw rod (32) penetrates through the protection plate (3) and is in threaded connection with the bearing seat (1);

four equal swing joint in guard plate (3) top has baffle (4), and adjacent baffle (4) is provided with position control device with guard plate (3) peripheral one side, position control device is used for the position angle guiding mechanism of baffle (4) on guard plate (3).

2. The stacking and inclination preventing device for the high-doped fly ash wall material according to claim 1, wherein the bearing seat (1) further comprises:

power supply unit (11), bear seat (1) lower surface middle part all around equal fixedly connected with power supply unit (11), bear seat (1) peripheral front middle part and seted up and accomodate groove (5), accomodate groove (5) inner wall one side middle part bottom fixedly connected with controller (51).

3. The stacking and inclination preventing device for the high-doped fly ash wall material according to claim 1, wherein the bearing seat (1) further comprises:

storage tank (12), hold carrier seat (1) upper surface middle part and seted up storage tank (12), storage tank (12) are positive quadrangle structure, storage tank (12) lower surface middle part edge all around has seted up spout (13), storage tank (12) and spout (13) slip grafting are run through to guard plate (3) peripheral bottom, storage tank (12) and spout (13) are used for guard plate (3) at the removal stop gear who holds carrier seat (1).

4. The stacking and inclination preventing device for the high-doped fly ash wall material as claimed in claim 3, wherein the bearing seat (1) further comprises:

spacing groove (14), spacing groove (14) have all been seted up at storage tank (12) inner wall middle part all around, spacing groove (14) are used for the peripheral positioning mechanism when laminating to storage tank (12) inner wall of guard plate (3) one side, thread groove (15) have been seted up at spacing groove (14) inner wall one side middle part, screw rod (32) periphery runs through spacing groove (14) and is pegged graft with thread groove (15) screw thread.

5. The high-volume fly ash walling placement anti-tilt device as claimed in claim 1, wherein the position adjusting device further comprises:

hollow iron plate (42), baffle (4) peripheral one side middle part top fixedly connected with hollow iron plate (42), guard plate (3) peripheral one side middle part top fixedly connected with mount pad (43), threaded rod (44) are pegged graft to mount pad (43) middle part screw thread, threaded rod (44) top has cup jointed regulating block (46) through the bearing rotation, one side embedding that regulating block (46) are close to hollow iron plate (42) has electro-magnet (47), electro-magnet (47) are used for the position positioning mechanism between regulating block (46) and hollow iron plate (42).

6. The stacking and inclination preventing device for the high-volume fly ash wall material according to claim 5, wherein a rotary table (45) is fixedly connected to the bottom end of the threaded rod (44) through the mounting seat (43), the hollow iron block (42) is of a triangular prism structure, the adjusting block (46) is of a pentagonal prism structure, and one side of the periphery of the adjusting block (46) is attached to the hollow iron block (42) in a sliding manner.

7. The stacking and inclination preventing device for the high-doped fly ash wall material according to claim 5, wherein a protection pad (41) is arranged on the other side of the partition plate (4) and the other side of the protection plate (3), and memory cotton is arranged inside the protection pad (41).

8. The stacking and inclination preventing device for the high-doped fly ash wall material according to claim 1, wherein the bearing seat (1) further comprises:

the device comprises a bearing seat (1), a connecting seat (2) is arranged at the bottom end of two sides of the periphery of the bearing seat (1) close to the edges of the two ends, one end of the connecting seat (2) is rotatably connected with a supporting seat (21) through a rotating shaft, a hemisphere (22) is arranged at one end of the lower surface of the supporting seat (21), and the hemisphere (22) is positioned below the bearing seat (1);

a servo motor (23) is arranged in the supporting seat (21) and close to one end, the power output end of the servo motor (23) penetrates through the supporting seat (21) and is fixedly connected with a screw rod (24), a thread sleeve (25) is sleeved on the periphery of the screw rod (24) in a threaded manner, a limiting block (26) is fixedly connected to the top end of the screw rod (24), the limiting block (26) is used for a limiting mechanism for the thread sleeve (25) to move on the periphery of the screw rod (24), a universal joint (27) is fixedly connected to the middle of one side of the periphery of the thread sleeve (25), one end of the universal joint (27) is fixedly connected with a fixing seat (28), and the bottom end of the fixing seat (28) is fixedly connected with the bearing seat (1);

bear seat (1) lower surface and all be embedded into infrared sensor (29) near four edges, infrared sensor (29) are used for detecting bear the distance mechanism between four edges and the bottom surface of seat (1) lower surface.

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