CN209590980U - A kind of picking shipment device for automatic vending machine - Google Patents

Abstract

The utility model belongs to automatic vending technical field, disclose a kind of picking shipment device for automatic vending machine, including picking mechanism and the outloading mechanism being connected with the picking mechanism, the picking mechanism includes picking pedestal, the picking pedestal is equipped with telescopic component, the top of the telescopic component is equipped with picking part, and the driving mechanism for driving the telescopic component to stretch up and down is additionally provided on picking pedestal.The utility model enables picking part to rise or decline with cargo by the flexible of driving mechanisms control telescopic component, and shipment is steady, and cargo damage rate is low, and cargo security is high.

Description

A kind of picking shipment device for automatic vending machine

Technical field

The utility model belongs to automatic vending technical field, and in particular to a kind of picking shipment dress for automatic vending machine It sets.

Background technique

Automatic vending machine is a kind of novel selling apparatus, its main feature is that being replaced using machine automatic vending traditional artificial It sells goods, it is a kind of completely new retailing form that it is not limited by time, place, can be saved manpower, be facilitated transaction, and quilt Referred to as 24 hours unmanned smart supermarkets.Although the type of merchandize that can be sold at present by self-service machine is extremely limited, Its advantage is obvious: can be positioned at anywhere, and can break through the limitation of business hours, mention at any time for people For the cargo of the needs such as cigarette, beverage, newspaper, film, packaged food purchase.

Existing automatic vending machine usually has shipment system based on spring spiral cargo path, based on (snakelike) the accumulation goods of S-shaped The shipment system in road, the shipment system based on crawler belt cargo path and Duo Men cubby automatic vending machine, existing automatic vending machine Structure is mostly more complex, and cargo can fall directly into shipment track, this shipment mode pair after completing purchase under gravity The damage of product is very big, especially the cargo of glass packaging, and impact failure may be generated in shipment, influences cargo Market quality.

Utility model content

In order to solve the above problems existing in the present technology, the utility model aim is to provide a kind of for automatic vending The picking shipment device of machine, cargo conveying is steady, and cargo damage rate is low.

The technology employed by the present utility model is a kind of picking shipment device for automatic vending machine, including take Cargo aircraft structure and the outloading mechanism being connected with the picking mechanism, the picking mechanism include picking pedestal, on the picking pedestal Equipped with telescopic component, the top of the telescopic component is equipped with picking part, is additionally provided on picking pedestal for driving described flexible group The driving mechanism that part stretches up and down.

It is preferred that the telescopic component includes X-type expansion bracket, the lower section of X-type expansion bracket is equipped with and picking pedestal The picking support being slidably matched, the picking pedestal are equipped with the first limit sliding rail being adapted to the picking support；The X-type The bottom end of expansion bracket is equipped with first end point and the second endpoint, and the first end point and picking support are hinged, the second endpoint hinge It is connected to the first sliding seat, first sliding seat is slidably arranged on picking support, and picking support is equipped with and described first Second limit sliding rail of sliding seat adaptation；The top of the X-type expansion bracket is equipped with third endpoint and the 4th endpoint, the third end Point is hinged with picking part, and the 4th endpoint is hinged with connecting rod, and the end of the connecting rod is hinged with the second sliding seat, and described second Sliding seat is slidably arranged on picking part, and picking part is equipped with the third limit sliding rail being adapted to second sliding seat.

It is preferred that being equipped with two sets of X-type expansion brackets on the picking support side by side, connect between two sets of X-type expansion brackets It is connected to several pieces of connecting plates.

It is preferred that the outloading mechanism includes the shipment slide bar being arranged on picking pedestal, the shipment slide bar Upper sliding is provided with shipment door, and the shipment door is interlocked by a linked component and the picking support.

It is preferred that the linked component includes interlocking pull rod, the gearing pull rod is hinged on picking pedestal, even One end of dynamic pull rod is hinged with the gearing raised line through the picking pedestal, and the other end for interlocking pull rod is hinged with to be taken through described The pulling item of goods pedestal, the pulling item are interlocked by a drawing article and shipment door；The gearing pull rod is equipped with torsional spring, torsional spring Both ends respectively with interlock raised line and pulling item connect；One end of the picking support is equipped with slip base, the bottom of the slip base Portion is equipped with inclined slippage slot, and the slippage slot is slidably matched with raised line is interlocked.

It is preferred that the drawing article includes the first articulation piece, the second articulation piece, X-type body cradle and supporting element, institute The middle part for stating X-type body cradle is connect with item is pulled, and the bottom of X-type body cradle is connect by the first articulation piece with picking pedestal, X-type The top of body cradle is connect by the second articulation piece with supporting element, and the supporting element is connect with shipment door, and supporting element with it is described The cooperation of shipment sliding bar.

It is preferred that the supporting element includes upper support seat and the lower support base for being used to support upper support seat, it is described Upper support seat is connect with shipment door, and lower support base is connect with the second articulation piece, the upper support seat end opposite with lower support base Face is disposed as the inclined surface being mutually matched.

It is preferred that offer strip-shaped hole on the upper support seat, be movably equipped in the strip-shaped hole with it is described go out One end of the sliding sleeve of goods slide bar adaptation, the strip-shaped hole is equipped with clamping block, and locking is equipped between the clamping block and the sliding sleeve Axis, described lock shaft one end are fixedly connected with the sliding sleeve, and the lock shaft other end is slidably connected with the clamping block, and are locked Returning spring is arranged on dead axle.

It is preferred that on the slip base rotation be equipped with locking piece, one end of the locking piece be connected with it is described The flexible fastener that picking pedestal matches, the other end of locking piece and the X-type expansion bracket interlock.

It is preferred that the driving mechanism includes the driving motor being arranged on picking pedestal, the driving motor Output end be equipped with screw rod, first sliding seat is equipped with thread bush, and the thread bush is connect with the screw flight.

The utility model has the following beneficial effects:

1, the picking shipment device of the utility model includes picking mechanism and the outloading mechanism that is connected with picking mechanism, picking Mechanism includes picking pedestal, and picking pedestal is equipped with telescopic component, and the top of telescopic component is equipped with picking part, goes back on picking pedestal Equipped with the driving mechanism for driving telescopic component to stretch up and down.By the flexible of driving mechanisms control telescopic component, make picking Part can rise or decline with cargo, and the utility model shipment is steady, and cargo damage rate is low, and cargo security is high.

2, the telescopic component of the utility model includes X-type expansion bracket, and the bottom end of X-type expansion bracket is equipped with first end point and second The top of endpoint, X-type expansion bracket is equipped with third endpoint and the 4th endpoint, and third endpoint and picking part are hinged, and the 4th endpoint is hinged There is connecting rod, the end of connecting rod is hinged with the second sliding seat.After the elongation of X-type expansion bracket, picking part withstands cargo, the second sliding seat It is slided backward along third limit sliding rail, connecting rod is made gradually to trail, connecting rod is higher than one end of picking part after trailing another Cargo is withstood and removes cargo by end, the higher one end of picking part, and picking part picking is steady, and cargo peace can be effectively protected Entirely.

3, the linked component of the utility model includes interlocking pull rod, and the one end for interlocking pull rod is hinged with gearing raised line, is interlocked The other end of pull rod is hinged with pulling item, and item is pulled to interlock by a drawing article and shipment door.Drawing article has displacement enlargement Effect, the thin tail sheep for pulling item to generate make shipment door generate biggish slide displacement by the amplification of drawing article.Pull item The sliding of shipment door is pulled by drawing article, a goods-out path is reserved after the sliding of shipment door, picking part passes through goods-out path for goods Object is delivered to user.The utility model structure is simple, and cargo transfer is convenient, and it is broken that collision is not likely to produce during cargo transfer Damage.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of the utility model；

Fig. 2 is the explosive view of the utility model；

Fig. 3 is the structural schematic diagram of telescopic component in the utility model；

Fig. 4 is the structural schematic diagram of linked component in the utility model；

Fig. 5 is the structural schematic diagram of returning spring in the utility model；

In figure: 1- picking pedestal；2- picking part；3-X type expansion bracket；4- picking support；The first sliding seat of 5-；6- connecting rod； The second sliding seat of 7-；8- connecting plate；9- shipment slide bar；10- shipment door；11- interlocks pull rod；12- interlocks raised line；13- pulls item； 14- torsional spring；15- slip base；16- slippage slot；The first articulation piece of 17-；The second articulation piece of 18-；19-X type body cradle；It is propped up on 20- Support seat；Support base under 21-；22- strip-shaped hole；23- sliding sleeve；24- clamping block；25- lock shaft；26- returning spring；27- locking piece； 28- stretches fastener；29- driving motor；30- screw rod；31- thread bush.

Specific embodiment

As depicted in figs. 1 and 2, a kind of picking shipment device for automatic vending machine is present embodiments provided, including is taken Cargo aircraft structure and the outloading mechanism being connected with the picking mechanism, picking mechanism have the function of that picking, picking mechanism will in picking Cargo on cargo show-plate is removed, and is delivered to outloading mechanism, and cargo is conveyed to user by outloading mechanism.

The picking mechanism includes picking pedestal 1, and the picking pedestal 1 is equipped with telescopic component, the telescopic component Top is equipped with picking part 2, and the driving mechanism for driving the telescopic component to stretch up and down is additionally provided on picking pedestal 1.Usually Cargo is by being suspended on cargo show-plate, when picking 2 picking of part, by the elongation of driving mechanisms control telescopic component, makes to take The constraint that cargo is slowly jacked up and cargo is made to be detached from hook by goods part 2, to complete picking；Driving mechanisms control after the completion of picking The contraction of telescopic component declines picking part 2 slowly with cargo, and cargo is delivered to outloading mechanism.

As shown in figure 3, specifically, the telescopic component includes X-type expansion bracket 3, the lower section of X-type expansion bracket 3 is equipped with and takes The picking support 4 that goods pedestal 1 is slidably matched, the picking pedestal 1 are equipped with the first limit being adapted to the picking support 4 and slide Rail, picking support 4 can slide back and forth in a certain range along the first limit sliding rail.The bottom end of the X-type expansion bracket 3 is equipped with First end point and the second endpoint, the first end point and picking support 4 are hinged, and the second end is point articulated the first sliding seat 5, First sliding seat 5 is slidably arranged on picking support 4, and picking support 4 is equipped with and is adapted to first sliding seat 5 Second limit sliding rail, the first sliding seat 5 can slide back and forth in a certain range along the second limit sliding rail.The X-type is flexible The top of frame 3 is equipped with third endpoint and the 4th endpoint, and the third endpoint and picking part 2 are hinged, and the 4th endpoint is hinged with Connecting rod 6, the end of the connecting rod 6 are hinged with the second sliding seat 7, and second sliding seat 7 is slidably arranged on picking part 2, and Picking part 2 is equipped with the third limit sliding rail being adapted to second sliding seat 7, and the second sliding seat 7 can be limited along third Sliding rail slides back and forth in a certain range.

Preferably, two sets of X-type expansion brackets 3 are equipped on the picking support 4 side by side, are connected between two sets of X-type expansion brackets 3 Several pieces of connecting plates 8.Two sets of X-type expansion brackets 3 are connect with picking part 2, and driving mechanism can drive two sets of telescopic components simultaneously Movement, connecting plate 8 can increase the stability of two sets of X-type expansion brackets 3, carry out picking convenient for picking part 2.

The outloading mechanism includes the shipment slide bar 9 being arranged on picking pedestal 1, slides setting on the shipment slide bar 9 There is shipment door 10, the shipment door 10 is interlocked by a linked component and the picking support 4.After picking part 2 completes picking, lead to Mechanism controls of overdriving picking support 4 slides on picking pedestal 1, since linked component and picking support 4 interlock, picking support When 4 sliding, makes shipment door 10 along 9 slide downward certain distance of shipment slide bar by the effect of linked component, reserve one and go out Goods channel, picking part 2 pass through goods-out path to user's conveying articles.

As shown in figure 4, the linked component includes interlocking pull rod 11, the gearing pull rod 11 is hinged on picking pedestal 1, The middle part for usually interlocking pull rod 11 is hinged on the bottom surface of picking pedestal 1.The one end for interlocking pull rod 11 is hinged with to be taken through described The gearing raised line 12 of goods pedestal 1, the other end for interlocking pull rod 11 are hinged with the pulling item 13 through the picking pedestal 1, picking It is set on pedestal 1 there are two limiting through hole, two limiting through hole are matched with gearing raised line 12 and pulling item 13 respectively, interlock raised line 12 It can be slided in limiting through hole with pulling item 13.The pulling item 13 is interlocked by a drawing article and shipment door 10；The company Dynamic pull rod 11 is equipped with torsional spring 14, and the both ends of torsional spring 14 are connect with gearing raised line 12 and pulling item 13 respectively；The picking support 4 One end be equipped with slip base 15, the bottom of the slip base 15 is equipped with inclined slippage slot 16, and the slippage slot 16 and gearing are convex Item 12 is slidably matched.Preferably, the end for interlocking raised line 12 is equipped with movable pulley, facilitates gearing raised line 12 sliding on slippage slot 16 It is dynamic.When sliding on picking pedestal 1, slippage slot 16 produces relative sliding picking support 4 with raised line 12 is interlocked, due to slippage slot 16 It is obliquely installed, under the action of torsional spring 14, the height for interlocking raised line 12 increases, and drives the height decline for pulling item 13, pulls item 13 pull shipment door 10 along 9 slide downward of shipment slide bar by drawing article.

The drawing article includes the first articulation piece 17, the second articulation piece 18, X-type body cradle 19 and supporting element, the X-type hinge The middle part for connecing frame 19 is connect with item 13 is pulled, and pulls the hinged axis connection of item 13 and X-type body cradle 19.The bottom of X-type body cradle 19 Portion is connect by the first articulation piece 17 with picking pedestal 1, and the top of X-type body cradle 19 is connected by the second articulation piece 18 with supporting element It connects, the supporting element is connect with shipment door 10, and supporting element is slidably matched with the shipment slide bar 9.First articulation piece 17 includes Two hinge strips, one end of two hinge strips is hinged with picking pedestal 1, and the other end is hinged with the bottom of X-type body cradle 19. Second articulation piece 18 also includes two hinge strips, and one end of two hinge strips connect with supporting element hingedly, and the other end is and X-type The top of body cradle 19 is hinged.Drawing article has the function of displacement enlargement, and the thin tail sheep for pulling item 13 to generate passes through drawing article Amplification makes shipment door 10 generate biggish slide displacement.

The supporting element includes upper support seat 20 and the lower support base 21 for being used to support upper support seat 20, upper support seat 20 with Lower support base 21 is slidably connected with shipment slide bar 9, and the upper support seat 20 is connect with shipment door 10, lower support base 21 and second Articulation piece 18 connects, and the upper support seat 20 end face opposite with lower support base 21 is disposed as the inclined surface being mutually matched.It draws When dynamic item 13 drives lower support base 21 to move up and down, upper support seat 20 is moved up and down with lower support base 21, produces shipment door 10 Raw movement.

Strip-shaped hole 22 is offered on the upper support seat 20, is movably equipped in the strip-shaped hole 22 and the shipment slide bar 9 One end of the sliding sleeve 23 of adaptation, the strip-shaped hole 22 is equipped with clamping block 24, is equipped between the clamping block 24 and the sliding sleeve 23 Lock shaft 25, described 25 one end of lock shaft are fixedly connected with the sliding sleeve 23,25 other end of lock shaft and the clamping block 24 are slidably connected, and returning spring 26 is arranged in lock shaft 25.

Clamping block 24 is fixed on upper support seat 20, when upper support seat 20 slides up and down, clamping block 24 is made to drive sliding sleeve 23 It is slided on shipment slide bar 9.Lower support base 21 provides a supporting role upper support seat 20, lower support base 21 make upper support seat 20 to On when sliding into certain position, since the end face opposite with lower support base 21 of upper support seat 20 is disposed as the inclination being mutually matched Face, lower support base 21 continue to slide up upper support seat 20, and returning spring 26 is compressed, upper support seat 20 and lower support base 21 Inclined surface misplace, while sliding sleeve 23 strip-shaped hole 22 along strip-shaped hole 22 length direction slide, final returning spring When 26 decrement reaches maximum value, returning spring 26 pushes against sliding sleeve 23, so that upper support seat 20 is locked, prevents upper support seat 20 slide downwards.

As shown in figure 5, rotation is equipped with locking piece 27 on the slip base 15, one end of the locking piece 27 is connected with and institute The flexible fastener 28 that picking pedestal 1 matches is stated, the other end of locking piece 27 and the X-type expansion bracket 3 interlock.Locking piece 27 Middle part and slip base 15 are rotatablely connected, and one end of locking piece 27 is connect with flexible fastener 28, and when X-type expansion bracket 3 extends, stretch card Part 28 is caught on picking pedestal 1, and slip base 15 is locked, and prevents slip base 15 mobile；When X-type expansion bracket 3 is shunk, X-type is flexible Frame 3 applies downward active force to one end of locking piece 27, and one end that locking piece 27 is connect with flexible fastener 28 moves upwards, makes Flexible fastener 28 is skidded off from picking pedestal 1, slides slip base 15 with mobile picking support 4.

The driving mechanism includes the driving motor 29 being arranged on picking pedestal 1, the output end of the driving motor 29 Equipped with screw rod 30, first sliding seat 5 is equipped with thread bush 31, and the thread bush 31 is threadedly coupled with the screw rod 30. When needing picking, control driving motor 29 is run, and the first sliding seat 5 first is slided backward along the second limit sliding rail, stretches X-type Contracting frame 3 gradually extends, and after X-type expansion bracket 3 extends, picking part 2 withstands cargo, and driving motor 29 continues to run, the second sliding Seat 7 is slided backward along third limit sliding rail, and connecting rod 6 is made gradually to trail, and connecting rod 6 makes one end of picking part 2 high after trailing In the other end, cargo is withstood and removes cargo from hook by the higher one end of picking part 2.

In the present embodiment, the picking part 2 includes picking plate, and the edge of the picking plate is equipped with position-limited edge, limit Side can prevent cargo from falling from picking plate, preferably protect cargo.

The utility model in use, is needed from when picking, control driving motor 29 is run, first on cargo show-plate First the first sliding seat 5 is slided backward along the second limit sliding rail, extends X-type expansion bracket 3 gradually, and picking part 2 withstands cargo, Driving motor 29 continues to run, and the second sliding seat 7 is slided backward along third limit sliding rail, so that connecting rod 6 is gradually trailed, connecting rod 6 trail after so that one end of picking part 2 is higher than the other end, the higher one end of picking part 2 pushes up cargo and by cargo upwards from extension It is removed on hook.After picking part 2 gets cargo, the control operation of driving motor 29 gradually tapers up X-type expansion bracket 3, the first sliding seat 5 Along the second limit sliding rail forward slip, due to the position-limiting action of the second limit sliding rail, the first sliding seat 5 slides into the second limit It can not continue to slide after extreme, X-type expansion bracket 3 is shunk completely at this time, and X-type expansion bracket 3 depresses locking piece 27, makes locking piece 27 one end connecting with flexible fastener 28 move upwards, and flexible fastener 28 is skidded off from picking pedestal 1, make driving motor 29 can be with Make picking support 4 along the first limit sliding rail forward slip.When picking support 4 slides, slippage slot 16 and gearing raised line 12 are generated Opposite sliding, the height for interlocking raised line 12 increase, and drive the height decline for pulling item 13, item 13 is pulled to pull out by drawing article For goods door 10 along 9 slide downward of shipment slide bar, shipment door 10 reserves a goods-out path after sliding, and picking part 2 is logical by shipment Road is to user's conveying articles.Cargo can also be directly delivered on picking part 2 by the utility model, not needed in cargo show-plate Cargo is conveyed to user by controlling driving motor 29 by upper picking.

The utility model is not limited to above-mentioned optional embodiment, anyone can obtain under the enlightenment of the utility model Other various forms of products, however, making any variation in its shape or structure, all the utility model rights that falls into are wanted The technical solution in confining spectrum is sought, is all fallen within the protection scope of the utility model.

Claims (10)

1. a kind of picking shipment device for automatic vending machine, it is characterised in that: including picking mechanism and with the picking machine The connected outloading mechanism of structure, the picking mechanism includes picking pedestal (1), and the picking pedestal (1) is equipped with telescopic component, institute The top for stating telescopic component is equipped with picking part (2), is additionally provided on picking pedestal (1) for driving the telescopic component flexible up and down Driving mechanism.

2. the picking shipment device according to claim 1 for automatic vending machine, it is characterised in that: the telescopic component Including X-type expansion bracket (3), the lower section of the X-type expansion bracket (3) is equipped with the picking support being slidably matched with picking pedestal (1) (4), the picking pedestal (1) is equipped with the first limit sliding rail being adapted to the picking support (4)；The X-type expansion bracket (3) Bottom end be equipped with first end point and the second endpoint, hingedly, the second end is point articulated to be had for the first end point and picking support (4) First sliding seat (5), first sliding seat (5) are slidably arranged on picking support (4), and picking support (4) be equipped with Second limit sliding rail of the first sliding seat (5) adaptation；The top of the X-type expansion bracket (3) is equipped with third endpoint and the 4th Endpoint, hingedly, the 4th endpoint is hinged with connecting rod (6), the end of the connecting rod (6) for the third endpoint and picking part (2) It is hinged with the second sliding seat (7), second sliding seat (7) is slidably arranged on picking part (2), and picking part (2) is equipped with The third limit sliding rail being adapted to second sliding seat (7).

3. the picking shipment device according to claim 2 for automatic vending machine, it is characterised in that: the picking support (4) two sets of X-type expansion brackets (3) are equipped on side by side, are connected with several pieces of connecting plates (8) between two sets of X-type expansion brackets (3).

4. the picking shipment device according to claim 2 for automatic vending machine, it is characterised in that: the outloading mechanism Including the shipment slide bar (9) being arranged on picking pedestal (1), sliding is provided with shipment door (10), institute on the shipment slide bar (9) Shipment door (10) are stated to interlock by a linked component and the picking support (4).

5. the picking shipment device according to claim 4 for automatic vending machine, it is characterised in that: the linked component Including interlocking pull rod (11), the gearing pull rod (11) is hinged on picking pedestal (1), and the one end for interlocking pull rod (11) is hinged with Through the gearing raised line (12) of the picking pedestal (1), the other end for interlocking pull rod (11) is hinged with through the picking pedestal (1) pulling item (13), the pulling item (13) are interlocked by a drawing article and shipment door (10)；On the gearing pull rod (11) Equipped with torsional spring (14), the both ends of torsional spring (14) are connect with gearing raised line (12) and pulling item (13) respectively；The picking support (4) One end be equipped with slip base (15), the bottom of the slip base (15) is equipped with inclined slippage slot (16), the slippage slot (16) It is slidably matched with raised line (12) are interlocked.

6. the picking shipment device according to claim 5 for automatic vending machine, it is characterised in that: the drawing article packet Include the first articulation piece (17), the second articulation piece (18), X-type body cradle (19) and supporting element, the middle part of the X-type body cradle (19) It is connect with item (13) are pulled, the bottom of X-type body cradle (19) is connect by the first articulation piece (17) with picking pedestal (1), X-type hinge The top for connecing frame (19) is connect by the second articulation piece (18) with supporting element, and the supporting element is connect with shipment door (10), and is propped up Support member is slidably matched with the shipment slide bar (9).

7. the picking shipment device according to claim 6 for automatic vending machine, it is characterised in that: the supporting element packet It includes upper support seat (20) and is used to support the lower support base (21) of upper support seat (20), the upper support seat (20) and shipment door (10) it connects, lower support base (21) connect with the second articulation piece (18), and the upper support seat (20) and lower support base (21) are opposite End face be disposed as the inclined surface being mutually matched.

8. the picking shipment device according to claim 7 for automatic vending machine, it is characterised in that: the upper support seat (20) it is offered on strip-shaped hole (22), is movably equipped with the sliding sleeve being adapted to the shipment slide bar (9) in the strip-shaped hole (22) (23), one end of the strip-shaped hole (22) is equipped with clamping block (24), is equipped between the clamping block (24) and the sliding sleeve (23) Lock shaft (25), described lock shaft (25) one end are fixedly connected with the sliding sleeve (23), lock shaft (25) other end and institute It states clamping block (24) to be slidably connected, and is arranged with returning spring (26) in lock shaft (25).

9. the picking shipment device according to claim 5 for automatic vending machine, it is characterised in that: the slip base (15) rotation is equipped with locking piece (27) on, and one end of the locking piece (27), which is connected with, to be matched with the picking pedestal (1) Flexible fastener (28), the other end of locking piece (27) and the X-type expansion bracket (3) interlock.

10. the picking shipment device according to claim 2 for automatic vending machine, it is characterised in that: the driving machine Structure includes the driving motor (29) being arranged on picking pedestal (1), and the output end of the driving motor (29) is equipped with screw rod (30), First sliding seat (5) is equipped with thread bush (31), and the thread bush (31) is threadedly coupled with the screw rod (30).