CN220213273U - Pushing structure - Google Patents

Abstract

The utility model discloses a pushing structure, which comprises a fixed frame, wherein a liftable platform is arranged on the fixed frame, a selecting mechanism is arranged on the platform, the selecting mechanism comprises a rotating piece, a first motor and a positioning hole, the rotating piece is rotationally connected to the platform, the first motor drives the rotating piece to rotate, the positioning hole is arranged on the platform and is positioned below the rotating piece, and when the rotating piece moves to the position above the positioning hole, the positioning hole is shielded; when the rotating piece moves to be staggered with the positioning hole, the positioning hole is opened, the fixing frame is provided with a swinging mechanism, the swinging mechanism comprises a rotating shaft, a second motor and a swinging piece, the rotating shaft is connected to the fixing frame and axially rotates through the driving action of the second motor, one end of the swinging piece is connected to the shaft body of the rotating shaft, and the other end of the swinging piece extends to the upper part of the rotating piece. The utility model realizes two groups of mutually noninterfere jacking actions, so that the jacked piece can be positioned at different height positions, and the whole structure is simple and easy to realize.

Description

Pushing structure

Technical Field

The utility model relates to the technical field of rehabilitation appliances, in particular to a pushing structure.

Background

Bedsores, also known as pressure sores and pressure ulcers, are characterized by damage, ulcers and even necrosis of skin and subcutaneous tissue due to the long-term influence of pressure on the local skin of the body on blood circulation, and are well developed in the pressed bone protruding parts. Bedsores are a common disease, especially in patients who are bedridden and physically weak, and are often found in the areas of pressed bony prominences, such as sacral coccyx, ischial tuberosities, thighbone tuberosities, lateral malleolus and heel.

The bedsores are caused by the fact that body pressure is concentrated on skin tissue in contact with the bed surface, and therefore, by changing the body position, the body pressure is prevented from being concentrated on specific skin tissue, and by dispersing the body pressure, the occurrence of bedsores can be prevented. However, it is difficult for a long-term bedridden patient and a bedridden elderly to spontaneously perform movements due to chronic diseases such as cerebral apoplexy and diabetes, and dyskinesia, and thus it is difficult to perform posture change. In addition, for these highly risky nursing persons, the task of changing the posture once every prescribed time with the 24-hour regime with the assistance of the nursing person is a heavy task.

Therefore, a novel nursing bed is needed in the market, the pressing unit can be controlled to move up and down locally or independently, local skin tissues are prevented from contacting the surface of the bed for a long time, the pressing unit can be separated from the skin tissues without changing the body position, and bedsores are prevented, but a plurality of local pressing units need to be lifted synchronously, so that the design of a pushing structure for driving the pressing unit to lift is particularly important, one lifting unit is usually adopted to correspond to one pushing structure in the market at present, point-to-point control is formed, thus the control purpose is achieved, but the reliability is very poor, the failure rate is very high, the structure is very complex, and the weight of the whole nursing bed is increased, so that a pushing structure for driving a plurality of pressing units to move synchronously and having a simple, stable and easy-to-realize structure is needed.

Disclosure of Invention

The utility model aims to solve the defects of the technology, and discloses a pushing structure for a nursing bed.

The utility model designs a pushing structure which comprises a fixed frame, wherein a liftable platform is arranged on the fixed frame, a selecting mechanism is arranged on the platform and comprises a rotating piece, a first motor and a positioning hole, the rotating piece is rotationally connected to the platform, the first motor drives the rotating piece to rotate, the positioning hole is arranged on the platform and is positioned below the rotating piece, and when the rotating piece moves to the position above the positioning hole, the positioning hole is shielded; when the rotating piece moves to be staggered with the positioning hole, the positioning hole is opened.

The pushing structure has the technical effects that the pushing structure comprises a selected mechanism, the selected mechanism mainly comprises a rotating part, the rotating part shields or opens a positioning hole below the rotating part through rotation, when the positioning hole shields, the rotating part can prop against the bottom end of the pressing unit along with the ascending of the selected mechanism, and jack up the pressing unit to realize the ascending of the pressing unit, when the positioning hole is opened, the platform ascends, the bottom end of the pressing unit is just inserted into the positioning hole to limit the pressing unit, so that the bottom of the pressing unit is in a suspended state, the pressing unit can be positioned at different height positions, the nursing bed is partially separated from a human body, the pressing unit is separated from a bedsore affected part, and the bedsore affected part is not pressed any more.

Further optimizing, be equipped with swing mechanism on the mount, swing mechanism includes pivot, second motor and swinging member, the pivot is connected on the mount and is driven action axial rotation through the second motor, swinging member one end is connected in the pivot shaft body, and the other end extends to the rotating member top, and when being equipped with the self-locking structure that locking it goes up and down on pressing the unit, swing mechanism can promote the self-locking structure of pressing the unit to unblock self-locking structure, consequently swing mechanism assists and realizes moving part automation and goes up and down.

Further preferably, an eccentric wheel rocker mechanism is arranged between the second motor and the rotating shaft, the eccentric wheel rocker mechanism comprises an eccentric wheel, a first rocker and a second rocker, the eccentric wheel is connected to the output shaft of the second motor, one end of the first rocker is connected to the eccentric wheel, the other end of the first rocker is hinged to one end of the second rocker, the other end of the second rocker is connected to the rotating shaft, and the eccentric wheel rocker mechanism can realize reliable rotation of the rotating shaft.

Further optimizing, the platform realizes going up and down through a drive mechanism, drive mechanism includes screw pair and third motor, screw pair connects in the platform both sides respectively, two screw pair synchronous operation of third motor drive to drive the platform and carry out elevating movement, the screw pair is not only transmission precision high, and the steady screw of two screw pairs of transmission all is equipped with the band pulley with the output of third motor, connects through the belt between the three band pulley, band pulley on the third motor output passes through the belt and drives two band pulley synchronous rotation in addition, realizes two screw pair synchronous operation to guarantee that the platform is the horizontality and goes up and down.

Further preferably, the number of the swinging pieces is multiple, and the swinging pieces are distributed along the axial direction of the rotating shaft, so that the swinging pieces can synchronously push the pressing units.

Preferably, the swing mechanism further comprises bearing seats for supporting the rotating shaft to rotate, and the bearing seats are in one-to-one correspondence with the swing pieces and are propped against the swing pieces, so that the strength of the swing pieces is enhanced, and the swing pieces are prevented from deforming in the pushing process.

Further preferably, the number of the selected mechanisms is multiple, the selected mechanisms are distributed linearly along the axial direction of the rotating shaft, and the selected mechanisms can correspond to the multiple pressing units at the same time to form local selection.

Preferably, the rotating member comprises a rotating portion and a shielding portion connected to the rotating portion, the rotating portion is mounted on the platform through a wheel shaft, gear teeth are arranged on the rotating portion, a gear meshed with the gear teeth of the rotating portion is arranged on the output shaft of the first motor, the shielding portion shields or opens two positioning holes along with rotation of the rotating portion, and the rotating member is driven to rotate through gear transmission.

Further preferably, the platform is provided with a limiting piece for limiting the rotation angle of the rotating piece so as to limit the rotation angle of the rotating piece, so that the positioning hole can be shielded or opened more accurately, and the rotating piece is prevented from rotating excessively.

Preferably, a metal gasket is arranged between the platform and the rotating part and between the platform and the limiting part, so that the rotating part is prevented from rotating for a long time to abrade the platform, the levelness of the platform is ensured by replacing the metal gasket, and finally, the selecting mechanism can accurately select the corresponding pressing unit.

Drawings

FIG. 1 is a top view of the overall structure of the present utility model;

FIG. 2 is a block diagram of a selected mechanism according to the present utility model;

FIG. 3 is a bottom view of the overall structure of the present utility model;

FIG. 4 is a rear elevational view of the overall structure of the present utility model;

FIG. 5 is an overall block diagram of a support structure;

FIG. 6 is an overall cross-sectional view of the support structure;

FIG. 7 is an enlarged view of FIG. 6 at A;

FIG. 8 is a block diagram of a plurality of support structures in combination;

fig. 9 is a schematic view of a support structure and the location of the present utility model.

In the figure: 100. a mounting frame; 101. a sleeve; 102. a support shaft; 103. a buffer spring; 104. a moving block; 105. an elastic member; 106. a through hole; 107. a ball; 108. a limit groove; 109. a stopper; 110. an avoidance unit; 111. self-lubricating guide bearings; 112. a spring seat; 113. a fixing seat; 114. a tension spring; 115. a base; 116. a first guide hole; 117. a second guide hole; 118. a universal connection; 119. a support; 120. a pressing pad; 121. lifting the cross bar; 122. a limiting piece; 123. lifting holes; 124. a protective sleeve; 125. a boost wheel;

200. a fixing frame; 201. a rotating member; 2011. a rotating part; 2012. a shielding part; 2013. gear teeth; 202. a first motor; 203. positioning holes; 204. a rotating shaft; 205. a second motor; 206. a swinging member; 207. an eccentric wheel; 208. a first rocker; 209. a second rocker; 210. a screw pair; 211. a third motor; 212. a belt wheel; 213. a belt; 214. a bearing seat; 215. a gear; 216. a limiting piece; 217. a metal gasket; 218. a platform.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the utility model, fall within the scope of protection of the utility model.

This pushing structure is one of them part of nursing bed, as shown in fig. 9, and it is located the bearing structure below, is equipped with on the bearing structure and presses the subassembly, forms to press the unit, and a plurality of pressing the unit and arrange and form nursing bed mattress, pushing structure drive presses the unit to go up and down the action to realize pressing the unit location to not co-altitude position, realized nursing bed local upper and lower position switch promptly, bedsore affected part just need not receive the oppression any more like this.

As shown in fig. 5 and 6, the supporting structure comprises a mounting frame 100, the mounting frame 100 is provided with a movable part, the movable part comprises a sleeve 101 and a supporting shaft 102, the mounting frame 100 is provided with a hole, the sleeve 101 is vertically arranged in the hole and can axially slide along the hole, the top of the sleeve 101 is provided with a pressing pad 120, the bottom of the sleeve is connected with a supporting shaft 102, the supporting shaft 102 is sleeved in the sleeve 101 and can axially slide along the sleeve 101, a buffer spring 103 is arranged between the sleeve 101 and the supporting shaft 102, one end of the buffer spring 103 is positioned in the sleeve 101 and abuts against the top end of the sleeve 101, the other end of the buffer spring abuts against the top end of the supporting shaft 102, a spring seat 112 is also arranged in the sleeve 101 and can axially slide in the sleeve 101, the top end of the spring seat 112 abuts against the buffer spring 103, the bottom end of the spring seat 102 is connected with the supporting shaft 102, the supporting shaft 102 is driven to rise, the supporting shaft 102 drives the spring seat 112 to rise, the spring seat 112 drives the buffer spring 103 to compress, the buffer spring 103 drives the sleeve 101 to rise, and the sleeve 101 drives the pressing pad 120 to rise, and the pressing pad 120 to rise. The top end of the supporting shaft 102 is provided with a connecting hole, a fastener is fixed in the connecting hole, and the spring seat 112 is connected with the top end of the supporting shaft 102 through the fastener, so that the detachable connection between the supporting shaft 102 and the sleeve 101 is realized.

The mounting frame 100 is provided with a self-locking assembly, the self-locking assembly comprises a moving block 104, the moving block 104 is connected with the mounting frame 100 in a sliding manner, the moving block 104 is similar to a small-sized shaft structure, the moving block is mounted on the mounting frame 100 close to the bottom of the supporting shaft 102, a hole is formed in the mounting frame 100, the moving block 104 is mounted in the hole, an elastic piece 105 is arranged between the moving block 104 and the mounting frame 100, one end of the elastic piece 105 is propped against the inner wall of the hole, the other end of the elastic piece 105 is propped against the bottom of the moving block 104, the moving block 104 can reciprocate along the hole, and the top end of the moving block 104 faces downwards and stretches out of the hole.

As shown in fig. 7, a through hole 106 is formed between the moving block 104 and the supporting shaft 102 on the mounting frame 100, two ends of the through hole 106 are respectively communicated with holes of the moving block 104 and the supporting shaft 102, a movable ball 107 is installed in the through hole 106, the length dimension of the through hole 106 is smaller than the diameter dimension of the ball 107, a limit groove 108 is formed in the peripheral wall of the supporting shaft 102 at the position of the through hole 106, the limit groove 108 can be used for inserting the ball 107 so as to lock the supporting shaft 102, the supporting shaft 102 is limited to lift, the moving block 104 is positioned at the other end of the through hole 106, the moving block 104 comprises a blocking part 109 and a avoiding part 110, the blocking part 109 and the avoiding part 110 are arranged on the outer wall of the moving block 104 along the sliding direction of the moving block 104, the diameter of the blocking part 109 is larger than that of the avoiding part 110, in this embodiment, the periphery of the moving block 104 is outwards protruded to form a blocking part 109, the periphery of the blocking part 109 is inwards recessed, the inwards recessed part 110 is formed along with the lifting of the moving block 104, when the moving block 104 moves to the blocking part 109 to align with the ball 107, the blocking part 109 slowly pushes the ball 107 to move towards the supporting shaft 102, and the limit groove 102 is formed by inserting one end or part 107 into the limit groove 108; when the moving block 104 moves to the avoiding portion 110 to align with the balls 107, the supporting shaft 102 is lifted up by a small extent under the driving of an external force, so that looseness is generated between the limiting groove 108 of the supporting shaft 102 and the balls 107, the supporting shaft 102 continues to lift up, the limiting groove 108 is driven to be staggered with the balls 107, the outer peripheral wall of the supporting shaft 102 pushes the balls 107 to move towards the moving block 104, the balls 107 retract into the avoiding portion 110, and finally the balls 107 are separated from the limiting groove 108, so that the supporting shaft 102 is unlocked.

In this embodiment, the number of the limiting grooves 108 is two, and the limiting grooves are vertically arranged along the sliding direction, so that the supporting shaft 102 can realize locking of two gears, namely, locking after the pressing pad 120 rises and falls.

In another embodiment, the mounting frame 100 includes a base 115, the base 115 is detachably connected to the mounting frame 100, a first guide hole 116 and a second guide hole 117 are formed in the base 115, the through hole 106 is located in the base 115, one end of the through hole 106 is communicated with the first guide hole 116, the top of the supporting shaft 102 is sleeved with the sleeve 101, the bottom of the supporting shaft passes through the first guide hole 116 and slides up and down along the first guide hole 116, the moving block 104 is installed in the second guide hole 117 from bottom to top, the elastic member 105 is located in the second guide hole 117, one end of the elastic member 105 abuts against the inner wall of the second guide hole 117, the other end abuts against the top end of the moving block 104, the top end of the moving block 104 extends out of the bottom end of the second guide hole 117, so that the external force drives the moving block 104, the moving block 104 is lifted in the second guide hole 117, the external force is removed, the moving block 104 is always in a naturally lowered position under the action of the elastic member 105, and when the moving block 104 is in the lowered position, the blocking portion 109 faces one end of the through hole 106, so that the blocking portion 109 is restrained in the through hole 106, and the ball 107 is only blocked in the through hole 106, when the external force drives the moving block 104, the moving block 109 moves, and the blocking portion 109 is separated from the through hole 106.

In another embodiment, the limiting groove 108 is arc-shaped, so that the balls 107 are slowly separated along the limiting groove 108 when the supporting shaft 102 is lifted, and the balls 107 are not blocked with the limiting groove 108.

In another embodiment, a self-lubricating guide bearing 111 is sleeved between the mounting frame 100 and the sleeve 101, so that the sleeve 101 is smooth and cannot be worn during sliding.

In another embodiment, a fixed seat 113 is detachably mounted at the bottom of the sleeve 101, the fixed seat 113 moves along with the sleeve 101, tension springs 114 are arranged between the fixed seat 113 and the mounting frame 100 along the sliding direction of the sleeve 101, and the number of the tension springs 114 is two and is respectively located at two sides of the fixed seat 113.

In another embodiment, the top of the sleeve 101 is provided with a pressing component, the pressing component comprises a universal connecting piece 118 and a supporting piece 119, the fixed end of the universal connecting piece 118 is fixed on the top of the sleeve 101, a spherical groove is formed in the center of the supporting piece 119, the spherical moving end of the universal connecting piece 118 is matched with the spherical groove, the supporting piece 119 can freely rotate along the top of the sleeve 101, a plurality of holes are annularly distributed in the supporting piece 119 by taking the spherical groove as the center, and a pressing pad 120 is installed in each hole, so that a complete pressing head is formed.

In another embodiment, as shown in fig. 8, when there are multiple sleeves 101, they are generally uniformly distributed on the mounting frame 100, and the supporting shaft 102, the self-locking component and the pressing component are all in one-to-one correspondence with the sleeves 101, so as to form a plurality of free combinations of supporting structures.

In another embodiment, the device further comprises a lifting cross rod 121, wherein the lifting cross rod 121 is horizontally arranged below the moving blocks 104, when the number of the supporting structures is multiple, the lifting cross rod 121 extends to the position right below each moving block 104 and is abutted with the bottom end of the moving block 104, and the moving blocks 104 are lifted through the lifting cross rod 121 so as to realize synchronous upward movement of all the moving blocks 104.

In another embodiment, the base 115 is provided with a plurality of limiting members 122 along the length direction of the lifting rail 121, and each limiting member 122 is provided with a lifting hole 123 through which the lifting rail 121 passes.

In another embodiment, the lifting cross rod 121 is a straight rod, and the supporting structures are horizontally and linearly arranged, that is, the sleeves 101 are linearly distributed on the mounting frame 100, each sleeve 101 corresponds to one supporting shaft 102 and one self-locking component, and the lifting cross rod 121 is horizontally placed at the bottom of the moving block 104.

In another embodiment, the sleeve 101 is externally sleeved with a protective sleeve 124 to prevent dust and protect the sleeve 124 from the outer wall of the sleeve 101.

The working principle is that under the normal state, the movable block 104 is acted by the elastic piece 105 and is in the descending state, at the moment, the stop part 109 of the movable block 104 is opposite to one end of the through hole 106 of the base 115 and is propped against the ball 107, the ball 107 is restrained in the through hole 106, the ball 107 is partially inserted into the limit groove 108 on the supporting shaft 102 towards the supporting shaft 102, and at the moment, the supporting shaft 102 is in the locking state; when the moving block 104 is driven by the lifting cross rod 121 to perform lifting action, the moving block 104 moves upwards, the blocking part 109 of the moving block 104 is staggered with the through hole 106, the avoiding part 110 of the moving block 104 is opposite to the through hole 106, so that the moving block 104 does not restrict the balls 107 any more, namely, the supporting shaft 102 is unlocked, the supporting shaft 102 and the sleeve naturally descend, then the supporting shaft 102 is driven by external force to perform lifting action, looseness is generated between the balls 107 and the limiting grooves 108, the limiting grooves 108 are gradually staggered with the balls 107, the balls 107 move towards the avoiding grooves until the balls 107 are completely staggered with the limiting grooves 108, the supporting shaft 102 is in an unlocking state, the supporting shaft 102 can perform lifting action under the driving of external force, when the two limiting grooves 108 on the supporting shaft 102 are arranged, the supporting shaft 102 is unlocked by the first limiting groove 108 and then performs lifting action to the next limiting groove 108, and is locked at the limiting groove 108 by the self-locking assembly, and therefore the adjustment of different height positions of the pressing pad 120 at the top of the sleeve 101 is realized.

As shown in fig. 1, the pushing structure includes a fixing frame 200, the fixing frame 200 is located below the mounting frame, a platform 218 is provided on the fixing frame 200, the platform 218 is driven by a transmission mechanism to perform lifting movement, a selection mechanism is provided on the platform 218, the selection mechanism includes a rotating member 201, a first motor 202 and two positioning holes 203, the rotating member 201 is rotatably connected to the platform 218, the first motor 202 drives the rotating member 201 to rotate, as shown in fig. 2, the positioning holes 203 are located below the rotating member 201, shielding or opening of the positioning holes 203 is achieved by rotating the rotating member 201 to different angles, when the positioning holes 203 are shielded by the rotating member 201, the selection mechanism rises along with the platform 218 until the rotating member 201 abuts against the bottom end of the support shaft 102, the rotating member 201 lifts the support shaft 102, when the positioning holes 203 are opened, the bottom end of the platform 218 lifts the support shaft 102 is just inserted into the positioning holes 203, and the bottom of the support shaft 102 is in a suspended state.

The fixing frame 200 is further provided with a swinging mechanism, as shown in fig. 4, the swinging mechanism comprises a rotating shaft 204, a second motor 205 and a swinging member 206, the rotating shaft 204 is connected to the fixing frame 200 and is driven to axially rotate by the second motor 205, one end of the swinging member 206 is connected to the shaft body of the rotating shaft 204, the other end of the swinging member 206 extends to the upper part of the rotating member 201 and abuts against the lifting cross rod body, the swinging member 206 is driven to rotate around the shaft body of the rotating shaft 204 by the rotating shaft 204, the top of the swinging member 206 is a horizontal plane at the moment, the horizontal plane abuts against the bottom of the lifting cross rod, when the swinging member 206 rotates, the horizontal plane rotates along with the horizontal plane and can lift the lifting cross rod by a small distance, and the lifting cross rod is lifted up again to move the block, so that the self-locking assembly unlocks the supporting shaft 102, and the swinging member 206 is in a bending structure.

In addition, the lifting cross rod is sleeved with the booster wheel 125 at the position corresponding to the swinging piece 206, the swinging piece 206 is tightly abutted against the booster wheel 125, the swinging piece 206 directly applies force on the booster wheel 125, the lifting cross rod is indirectly lifted, the swinging piece 206 is prevented from directly contacting with the lifting cross rod, and the bending hidden trouble of the lifting cross rod is reduced.

In another embodiment, an eccentric rocker mechanism is disposed between the second motor 205 and the rotating shaft 204, the eccentric rocker mechanism includes an eccentric 207, a first rocker 208 and a second rocker 209, the eccentric 207 is mounted on an output shaft of the second motor 205, the output shaft of the second motor 205 drives the eccentric 207 to rotate, one end of the first rocker 208 is hinged to a protruding portion of the eccentric 207, the other end of the first rocker is hinged to one end of the second rocker 209, the other end of the second rocker 209 is fixed to the rotating shaft 204, the second motor 205 drives the eccentric 207 to rotate, the eccentric 207 drives the first rocker 208 and the second rocker 209 to link, the second rocker 209 drives the rotating shaft 204 to rotate, and the rotating shaft 204 drives the swinging member 206 to swing.

In another embodiment, the bottom of the swinging member 206 is similar to a hoop structure, which is disposed around the rotating shaft 204, and the top of the swinging member 206 extends below the lifting rail, and the top of the swinging member is provided with a horizontal plane for lifting the lifting rail.

In another embodiment, the transmission mechanism includes a screw pair 210 and a third motor 211, the screw pair 210 includes a screw and a nut slidingly connected to the screw, the screws are respectively located at two sides of the platform 218, the nut is connected with the platform 218, the nut drives the platform 218 to lift along with the rotation of the screw, the output ends of the two screws and the third motor 211 are respectively provided with a belt wheel 212, as shown in fig. 3, the three belt wheels 212 are connected through a belt 213, the belt wheel 212 on the output end of the third motor 211 drives the other two belt wheels 212 to synchronously rotate through the belt 213, so that the two screws can synchronously rotate, and the platform 218 can stably lift.

In another embodiment, the number of the swinging members 206 is plural, and the number of the booster wheels 125 on the lifting cross bar is plural along the axial direction of the rotating shaft 204 or uniformly and equidistantly distributed, and the booster wheels are in one-to-one correspondence with the swinging members 206, so that the plurality of swinging members 206 can push the lifting cross bar at the same time, and the lifting cross bar can uniformly and stably lift the plurality of moving blocks at the same time.

In another embodiment, the swing mechanism further includes a bearing block 214, the bearing block 214 is fixed on the fixing frame 200, the bearing block 214 is sleeved on the rotating shaft 204 to support the rotating shaft 204 to rotate, and the bearing blocks 214 are in one-to-one correspondence with the swing piece 206 and abut against one side of the swing piece 206, so as to strengthen the bottom strength of the swing piece 206 and prevent the swing piece 206 from bending and deforming.

In another embodiment, the rotating member 201 includes a rotating portion 2011 and a shielding portion 2012 connected to the rotating portion 2011, the rotating portion 2011 is mounted on the platform 218 through a wheel shaft, the rotating portion 2011 is provided with gear teeth 2013, that is, the gear teeth 2013 are disposed along the edge of the rotating portion 2011, the output shaft of the first motor 202 is provided with a gear 215 meshed with the gear teeth 2013 of the rotating portion 2011, the first motor 202 drives the gear 215 to rotate, the gear 215 drives the rotating member 201 to rotate, the shielding portion 2012 rotates to above the positioning hole 203 along with the rotating portion 2011, forms a shielding for the positioning hole 203, and the shielding portion 2012 rotates to be staggered with the positioning hole 203, so that the positioning hole 203 is opened.

In another embodiment, the number of the positioning holes 203 may be one or more, depending on the number and placement positions of the corresponding supporting shafts 102.

In another embodiment, the platform 218 is provided with a limiting member 216 for limiting the rotation angle of the rotating member 201, so that the rotating member 201 rotates within a range of shielding or opening the positioning hole 203 to avoid excessive rotation, and in this embodiment, the limiting member 216 is in a bolt-like structure and is fixed on two sides of the rotating member 201.

In another embodiment, a metal gasket 217 is disposed between the platform 218 and the rotating member 201 and the limiting member 216, the metal gasket 217 is generally in one-to-one correspondence with the selected mechanism, the metal gasket 217 is attached to the platform 218, and the rotating member 201 and the limiting member 216 are fixed to the platform 218 through the metal gasket 217, so that the rotating member 201 is prevented from scraping the surface of the platform 218.

The working principle of the two structures is that when the rotating piece 201 rotates to be staggered with the positioning hole 203, the positioning hole 203 is in an open state, the platform 218 is lifted to enable the bottom of the supporting shaft 102 to be inserted into the positioning hole 203, so that the supporting shaft 102 cannot be lifted; when the rotating member 201 rotates to the shielding positioning hole 203, the platform 218 rises, so that the rotating member 201 abuts against the bottom end of the supporting shaft 102 and lifts the supporting shaft 102, meanwhile, the swinging member 206 swings to lift the lifting cross rod 121, and the lifting cross rod 121 lifts the moving block 104 again, so that the self-locking assembly is unlocked, and the supporting shaft 102 lifts under the lifting of the rotating member 201.

The present utility model is not limited to the above-described preferred embodiments, and any person who can obtain other various products under the teaching of the present utility model, however, any change in shape or structure of the product is within the scope of the present utility model, and all the products having the same or similar technical solutions as the present application are included.

Claims (10)

1. The pushing structure is characterized by comprising a fixing frame (200), wherein a liftable platform (218) is arranged on the fixing frame (200), a selecting mechanism is arranged on the platform (218), the selecting mechanism comprises a rotating piece (201), a first motor (202) and a positioning hole (203), the rotating piece (201) is rotationally connected to the platform (218), the first motor (202) drives the rotating piece (201) to rotate, the positioning hole (203) is arranged on the platform (218) and is positioned below the rotating piece (201), and when the rotating piece (201) moves to the position above the positioning hole (203), the positioning hole (203) is shielded; when the rotating member (201) moves to be staggered with the positioning hole (203), the positioning hole (203) is opened.

2. The pushing structure according to claim 1, wherein the fixing frame (200) is provided with a swinging mechanism, the swinging mechanism comprises a rotating shaft (204), a second motor (205) and a swinging member (206), the rotating shaft (204) is connected to the fixing frame (200) and is driven by the second motor (205) to axially rotate, one end of the swinging member (206) is connected to the shaft body of the rotating shaft (204), and the other end extends to above the rotating member (201).

3. A pushing structure according to claim 2, characterized in that an eccentric rocker mechanism is arranged between the second motor (205) and the rotating shaft (204), the eccentric rocker mechanism comprises an eccentric wheel (207), a first rocker (208) and a second rocker (209), the eccentric wheel (207) is connected to the output shaft of the second motor (205), one end of the first rocker (208) is connected to the eccentric wheel (207), the other end is hinged to one end of the second rocker (209), and the other end of the second rocker (209) is connected to the rotating shaft (204).

4. The pushing structure according to claim 1, wherein the platform (218) is lifted by a transmission mechanism, the transmission mechanism comprises a screw pair (210) and a third motor (211), the screw pair (210) is respectively connected to two sides of the fixing frame (200), the third motor (211) drives the two screw pairs (210) to synchronously operate so as to drive the platform (218) to lift, the screws of the two screw pairs (210) and the output end of the third motor (211) are respectively provided with a belt wheel (212), the three belt wheels (212) are connected by a belt (213), and the belt wheel (212) on the output end of the third motor (211) drives the other two belt wheels (212) to synchronously rotate by the belt (213).

5. A pushing structure according to claim 2, wherein the number of said swinging members (206) is plural and distributed axially along the rotation shaft (204).

6. A pushing structure according to claim 2, wherein the swinging mechanism further comprises bearing blocks (214) for assisting the rotation of the supporting shaft (204), and the bearing blocks (214) are in one-to-one correspondence with the swinging members (206) and are arranged to abut against the swinging members (206).

7. A pushing structure according to claim 1, wherein said selected number of mechanisms is plural and linearly distributed along the axial direction of the rotary shaft (204).

8. A pushing structure according to claim 7, wherein the rotating member (201) comprises a rotating portion (2011) and a shielding portion (2012) connected to the rotating portion (2011), the rotating portion (2011) is mounted on the platform (218) through a wheel shaft, the rotating portion (2011) is provided with gear teeth (2013), the output shaft of the first motor (202) is provided with a gear (215) meshed with the gear teeth (2013) of the rotating portion (2011), and the shielding portion (2012) rotates along with the rotating portion (2011) to form shielding or opening to the two positioning holes (203).

9. A pushing structure according to claim 1, characterized in that the platform (218) is provided with a limiting member (216) for limiting the rotation angle of the rotation member (201).

10. A pushing structure according to claim 8, characterized in that a metal gasket (217) is provided between the platform (218) and the rotating member (201) and the limiting member (216).