CN110920019A

CN110920019A - Drying extruder convenient to move

Info

Publication number: CN110920019A
Application number: CN201911253364.XA
Authority: CN
Inventors: 李浒; 李伯如; 李伯胜; 李长�
Original assignee: Zhuzhou Lianxin Pioneer Metals Corp
Current assignee: Zhuzhou Lianxin Pioneer Metals Corp
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-03-27

Abstract

The invention discloses a drying extruder convenient to move, which comprises a base, an extruding device and a drying device, wherein a hole groove is formed in the base, a guide block is fixedly installed at the bottom of the hole groove, the moving device is arranged in the hole groove and comprises a driving motor, universal wheels and a roller wheel bracket, positioning blocks are symmetrically arranged on two sides of the driving motor, worms are rotatably installed on the positioning blocks, the worms are connected with the output end of the driving motor through belts for transmission, moving units are arranged on the worms, each moving unit comprises a rotating lead screw, a turbine is fixedly installed on the rotating lead screw, and a transition block is arranged on the rotating lead screw; the connecting assembly comprises a limiting sleeve fixedly arranged on a supporting plate and a guide rod fixedly arranged on a base, wherein the guide rod is slidably arranged in the limiting sleeve, and a tension spring is connected between the inner wall of the limiting sleeve and the bottom of the guide rod.

Description

Drying extruder convenient to move

Technical Field

The invention relates to the field of extruders, in particular to a drying extruder convenient to move.

Background

Common raw materials of the extruder comprise organic matters such as plastics and the like; the granular plastic raw material is easy to contain moisture, and in order to reduce the generation of bubbles in the later melting process of the moisture, a drying device is needed to be arranged to dry the moisture in the hopper so as to improve the quality of the molded part.

However, the existing drying extruder is not provided with a moving device, so that the carrying strength is high when the drying extruder needs to be moved, the time consumption is high, the labor is consumed, the working efficiency is low, and based on the situation, the drying extruder convenient to move is provided.

Disclosure of Invention

The invention aims to provide a drying extruder convenient to move so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a drying extruder convenient to move comprises a base, an extruding device and a drying device, wherein a support is arranged on the base, the extruding device is arranged on the support, the drying device is arranged on the base and the extruding device, an annular fixed seat is fixedly arranged on the base, a hole groove is formed in the base, guide blocks are fixedly arranged at the bottom of the hole groove, the guide blocks are symmetrically arranged, sliding grooves are formed in the guide blocks, a moving device is arranged in the hole groove, the moving device comprises a driving motor, a plurality of symmetrically arranged universal wheels and a roller wheel support for fixedly arranging the universal wheels, the driving motor is fixedly arranged on the base at the top of the hole groove, positioning blocks are symmetrically arranged on two sides of the driving motor, worms are rotatably arranged on the positioning blocks, and are connected and driven with the output end of the driving motor through belts, all be provided with the mobile unit on the worm, the mobile unit is including rotating the rotation lead screw of installing at the hole groove top, fixed mounting and worm intermeshing's turbine on the rotation lead screw, be provided with the transition piece rather than mutually supporting on the rotation lead screw, transition piece slidable mounting is in the spout, gyro wheel support fixed mounting is in the bottom of transition piece.

As a further scheme of the invention: and a cushion pad is fixedly arranged at the bottom of the annular fixed seat.

As a still further scheme of the invention: the screw rod is characterized in that a first groove is formed in the corresponding surface of the rotary screw rod and the base, a second groove is formed in the corresponding surface of the base and the rotary screw rod, and a rotary ball is movably arranged between the first groove and the second groove in an embedded mode.

As a still further scheme of the invention: the extrusion device comprises an extrusion motor, an extrusion box body and a feed hopper and an extrusion discharge hopper which are fixedly installed on the extrusion box body, the extrusion box body is fixedly installed on a support, the extrusion motor is fixedly installed on the extrusion box body, the output end of the extrusion motor is fixedly installed to extrude a rotating shaft, the extrusion rotating shaft is rotatably installed on the extrusion box body, and the spiral blade is fixedly installed on the extrusion rotating shaft to extrude.

As a still further scheme of the invention: drying device includes air-blower, bellows and hot gas flow circulation flow subassembly, air-blower and bellows fixed mounting are on the base, hot gas flow circulation flow subassembly sets up on extruding the box, air-blower and bellows pass through the tuber pipe and connect, the inside heating wire that is provided with of bellows, bellows and hot gas flow circulation flow subassembly communicate each other, hot gas flow circulation flow subassembly with extrude the box and communicate each other.

As a still further scheme of the invention: the hot air current circulating flow assembly comprises a circulating motor and a motor support used for fixing the circulating motor, the motor support is fixedly arranged on an extrusion box body, a first cylinder body and a second cylinder body are respectively arranged on two sides of the circulating motor, the first cylinder body and the second cylinder body are both fixedly arranged on the extrusion box body, a rotary table is fixedly arranged at the output end of the circulating motor, an eccentric shaft pin is fixedly arranged on the rotary table, a first connecting rod and a second connecting rod are rotatably arranged on the eccentric shaft pin, the first connecting rod and the second connecting rod are reversely arranged, a first piston rod is rotatably arranged at the end part of the first connecting rod, a first piston is fixedly arranged at the end part of the first piston rod, the first piston is slidably arranged in the first cylinder body, a second piston rod is rotatably arranged at the end part of the second connecting rod, a second piston is fixedly arranged at the end part of the second piston rod, and the second piston is slidably arranged, bellows and second cylinder body pass through first breather pipe intercommunication, the second cylinder body with extrude the box and pass through second breather pipe intercommunication, bellows and first cylinder body pass through third breather pipe intercommunication, first cylinder body with extrude the box and pass through fourth breather pipe intercommunication, equal fixed mounting has the check valve that prevents the air current against the current on first breather pipe, second breather pipe, third breather pipe and the fourth breather pipe.

As a still further scheme of the invention: the bottom of base is provided with supporting component, supporting component includes pneumatic push rod and the backup pad that the symmetry set up, pneumatic push rod fixed mounting is in the bottom of base, the equal fixed mounting of tip of pneumatic push rod has the connecting block, the removal spout has been seted up to the symmetry in the backup pad, all have damped slidable mounting in the removal spout and remove the slider, remove slider and connecting block one-to-one, be connected through the third connecting rod between removal slider and the connecting block, the third connecting rod rotates respectively and installs on removal slider and connecting block, be provided with coupling assembling between backup pad middle part and the base.

As a still further scheme of the invention: the coupling assembling includes stop collar and the guide bar of fixed mounting on the base of fixed mounting in the backup pad, guide bar slidable mounting is in the stop collar, be connected the extension spring between the bottom of stop collar inner wall and guide bar.

Compared with the prior art, the invention has the beneficial effects that:

through the rotation lead screw that sets up driving motor and symmetry set up, when needs remove the stoving extruder, driving motor rotates, under the connection transmission effect of mutually supporting through belt and worm and turbine, the lead screw is rotated in the drive, thereby drive transition piece slides down along the spout, and then drive universal wheel downstream, the universal wheel converts the strong point into whole stoving extruder, thereby realize the convenient removal of stoving extruder, time saving and labor saving, improve work efficiency when lightening porter's working strength.

Drawings

FIG. 1 is a schematic view of a drying extruder for easy movement.

Fig. 2 is a schematic structural diagram at a in fig. 1.

Fig. 3 is a schematic perspective view of a combination of a circulation motor, a rotary table, a first connecting rod and a second connecting rod in a drying extruder for easy movement.

Fig. 4 is a schematic structural diagram II of a drying extruder convenient to move.

In the figure: 1-base, 2-support, 3-annular fixed seat, 4-hole groove, 5-driving motor, 6-universal wheel, 7-positioning block, 8-worm, 9-guide block, 10-chute, 11-belt, 12-rotating screw rod, 13-turbine, 14-transition block, 15-roller support, 16-buffer pad, 17-first groove, 18-second groove, 19-rotating ball, 20-extruding motor, 21-extruding box, 22-feed hopper, 23-extruding rotating shaft, 24-extruding hopper, 25-extruding helical blade, 26-blower, 27-bellows, 28-electric heating wire, 29-circulating motor, 30-motor support, 31-first cylinder body, 32-second cylinder body, 33-rotary table, 34-eccentric shaft pin, 35-first connecting rod, 36-second connecting rod, 37-first piston rod, 38-first piston, 39-second piston rod, 40-second piston, 41-first vent pipe, 42-second vent pipe, 43-third vent pipe, 44-fourth vent pipe, 45-one-way valve, 46-pneumatic push rod, 47-supporting plate, 48-connecting block, 49-moving chute, 50-moving slide block, 51-third connecting rod, 52-limiting sleeve, 53-guide rod and 54-tension spring.

Detailed Description

The technical solution of the present patent will be described in further detail with reference to the following embodiments.

Example 1

Referring to fig. 1-3, a drying extruder convenient to move comprises a base 1, an extruding device and a drying device, wherein a support 2 is arranged on the base 1, the extruding device is arranged on the support 2, the drying device is arranged on the base 1 and the extruding device, an annular fixing seat 3 is fixedly arranged on the base 1, a hole groove 4 is formed in the base 1, guide blocks 9 are fixedly arranged at the bottom of the hole groove 4, the guide blocks 9 are symmetrically arranged, slide grooves 10 are respectively formed in the guide blocks 9, a moving device is arranged in the hole groove 4, the moving device comprises a driving motor 5, a plurality of symmetrically arranged universal wheels 6 and a roller support 15 for fixedly arranging the universal wheels 6, the driving motor 5 is fixedly arranged on the base 1 at the top of the hole groove 4, positioning blocks 7 are symmetrically arranged at two sides of the driving motor 5, worms 8 are rotatably arranged on the positioning blocks 7, the worm 8 and the output end of the driving motor 5 are connected and driven through a belt 11, the worm 8 is provided with a moving unit, the moving unit comprises a rotating screw rod 12 rotatably installed at the top of the hole groove 4, a turbine 13 meshed with the worm 8 is fixedly installed on the rotating screw rod 12, a transition block 14 matched with the rotating screw rod 12 is arranged on the rotating screw rod 12, the transition block 14 is slidably installed in the sliding groove 10, and the roller wheel support 15 is fixedly installed at the bottom of the transition block 14; by arranging the driving motor 5 and the symmetrically arranged rotating screw rods 12, when the drying extruder needs to be moved, the driving motor 5 rotates, and the rotating screw rods 12 are driven to rotate under the mutual matching connection transmission action of the belt 11, the worm 8 and the turbine 13, so that the transition blocks 14 are driven to slide downwards along the sliding grooves 10, the universal wheels 6 are driven to move downwards, the universal wheels 6 are converted into supporting points of the whole drying extruder, the drying extruder is convenient to move, time and labor are saved, the working intensity of a carrier is reduced, and the working efficiency is improved; further, in order to reduce the vibration generated when the drying extruder works, the annular fixed seat 3 is directly contacted with the ground, and a cushion pad 16 is fixedly arranged at the bottom of the annular fixed seat 3.

Specifically, a first groove 17 is formed in the corresponding surface of the rotary screw rod 12 and the base 1, a second groove 18 is formed in the corresponding surface of the base 1 and the rotary screw rod 12, and a rotary ball 19 which is movably arranged is embedded between the first groove 17 and the second groove 18, so that the rotary connection between the rotary screw rod 12 and the base 1 is realized.

The extruding device comprises an extruding motor 20, an extruding box body 21, a feeding hopper 22 and an extruding hopper 24, wherein the feeding hopper 22 and the extruding hopper 24 are fixedly arranged on the extruding box body 21, the extruding box body 21 is fixedly arranged on the support 2, the extruding motor 20 is fixedly arranged on the extruding box body 21, an extruding rotating shaft 23 is fixedly arranged at the output end of the extruding motor 20, the extruding rotating shaft 23 is rotatably arranged on the extruding box body 21, and an extruding spiral blade 25 is fixedly arranged on the extruding rotating shaft 23; through setting up extrusion motor 20 and extruding helical blade 25, the material gets into through feeder hopper 22, and extrusion motor 20 rotates and drives and extrude pivot 23 rotation to the drive is extruded helical blade 25 and is rotated, is about to extrude the material through extruding hopper 24 with the material.

The drying device comprises an air blower 26, an air box 27 and a hot air circulating flow assembly, wherein the air blower 26 and the air box 27 are fixedly arranged on the base 1, the hot air circulating flow assembly is arranged on the extrusion box body 21, the air blower 26 and the air box 27 are connected through an air pipe, an electric heating wire 28 is arranged inside the air box 27, the air box 27 is communicated with the hot air circulating flow assembly, and the hot air circulating flow assembly is communicated with the extrusion box body 21; through setting up air-blower 26 and heating wire 28, air-blower 26 bloies to bellows 27, and under the effect of heating wire 28, the wind that gets into through hot gas flow circulation subassembly and extrude in the box 21 changes into hot-blast, and then carries out drying process to the material that extrudes in the box 21, because hot gas flow circulation subassembly and bellows 27 all communicate each other with extruding box 21 to realize the circulation flow of hot gas flow, more abundant carry out drying process to the material that extrudes in the box 21.

The hot air current circulating flow assembly comprises a circulating motor 29 and a motor support 30 used for fixing the circulating motor 29, the motor support 30 is fixedly installed on an extrusion box body 21, a first cylinder body 31 and a second cylinder body 32 are respectively arranged on two sides of the circulating motor 29, the first cylinder body 31 and the second cylinder body 32 are both fixedly installed on the extrusion box body 21, a rotary table 33 is fixedly installed at the output end of the circulating motor 29, an eccentric shaft pin 34 is fixedly installed on the rotary table 33, a first connecting rod 35 and a second connecting rod 36 are rotatably installed on the eccentric shaft pin 34, the first connecting rod 35 and the second connecting rod 36 are reversely arranged, a first piston rod 37 is rotatably installed at the end of the first connecting rod 35, a first piston 38 is fixedly installed at the end of the first piston rod 37, the first piston 38 is slidably installed in the first cylinder body 31, and a second piston rod 39 is rotatably installed at the end of the second connecting rod 36, a second piston 40 is fixedly installed at the end of the second piston rod 39, the second piston 40 is slidably installed in the second cylinder 32, the air box 27 is communicated with the second cylinder 32 through a first vent pipe 41, the second cylinder 32 is communicated with the extrusion box body 21 through a second vent pipe 42, the air box 27 is communicated with the first cylinder 31 through a third vent pipe 43, the first cylinder 31 is communicated with the extrusion box body 21 through a fourth vent pipe 44, and check valves 45 for preventing air flow from flowing backwards are fixedly installed on the first vent pipe 41, the second vent pipe 42, the third vent pipe 43 and the fourth vent pipe 44; by arranging the circulating motor 29 and the rotating disc 33 fixedly provided with the eccentric shaft pin 34, during operation, the circulating motor 29 rotates to drive the rotating disc 33 to rotate, the first connecting rod 35 and the second connecting rod 36 are driven to perform connecting transmission under the action of the eccentric shaft pin 34, the first piston rod 37 and the second piston rod 39 are respectively driven to drive the first piston 38 and the second piston 40 to reciprocate in the first cylinder 31 and the second cylinder 32, when the second piston 40 moves leftwards, the second piston 40 sucks hot air in the air box 27 into the second cylinder 32 through the first vent pipe 41, meanwhile, the first piston 38 moves leftwards, presses the hot air in the first cylinder 31 into the air box 27 through the third vent pipe 43, on the contrary, when the second piston 40 moves rightwards, the second piston 40 presses hot air in the second cylinder 32 into the extrusion box body 21 through the second vent pipe 42, and simultaneously, the first piston 38 moves rightwards, hot air flow extruded out of the box body 21 is sucked into the first cylinder body 31 through the fourth vent pipe, and therefore the hot air flow circularly flows in the air box 27, the hot air flow is fully contacted with materials, and drying efficiency is improved.

The working principle of the embodiment is as follows: through the rotation lead screw 12 that sets up driving motor 5 and symmetry, when needs remove the stoving extruder, driving motor 5 rotates, under the connection transmission effect of mutually supporting through belt 11 and worm 8 and turbine 13, the drive rotates lead screw 12 and rotates, thereby drive transition piece 14 slides down along spout 10, and then drive universal wheel 6 downstream, universal wheel 6 converts the strong point of whole stoving extruder into, thereby realize the convenient removal of stoving extruder, time saving and labor saving, improve work efficiency when lightening porter's working strength.

Example 2

As shown in fig. 4, this embodiment is further improved based on embodiment 1, and the improvement is as follows: the bottom of the base 1 is provided with a support assembly, the support assembly comprises a pneumatic push rod 46 and a support plate 47 which are symmetrically arranged, the pneumatic push rod 46 is fixedly installed at the bottom of the base 1, the end parts of the pneumatic push rod 46 are fixedly provided with connecting blocks 48, the support plate 47 is symmetrically provided with moving sliding grooves 49, the moving sliding grooves 49 are internally provided with damping sliding installed moving sliders 50, the moving sliders 50 correspond to the connecting blocks 48 one by one, the moving sliders 50 are connected with the connecting blocks 48 through third connecting rods 51, the third connecting rods 51 are respectively rotatably installed on the moving sliders 50 and the connecting blocks 48, and a connecting assembly is arranged between the middle part of the support plate 47 and the base 1; through setting up pneumatic push rod 46 and the backup pad 47 that the symmetry set up, when needs remove, the pneumatic push rod 46 that the symmetry set up outwards stretches out and draws back, effect through third connecting rod 51, the drive removes slider 50 and slides along spout 49, move backup pad 47 downwards, thereby form and use backup pad 47 to be drying extruder jack-up as the backup pad, at this moment, driving motor 5 work drives universal wheel 6 downstream, back pneumatic push rod 46 backward movement drives backup pad 47 rebound shrink, it uses a plurality of universal wheels 6 as the strong point to form, thereby avoid universal wheel 6 direct action subaerial drying extruder jack-up, and then protection mobile device's safety.

The connecting assembly comprises a limiting sleeve 52 fixedly arranged on the supporting plate 47 and a guide rod 53 fixedly arranged on the base 1, the guide rod 53 is slidably arranged in the limiting sleeve 52, and a tension spring 54 is connected between the inner wall of the limiting sleeve 52 and the bottom of the guide rod 53; through the arrangement of the guide rod 53 and the limiting sleeve 52, the stability of the supporting plate 47 in the lifting process is ensured under the action of the tension spring 54.

The working principle of the embodiment is as follows: through setting up pneumatic push rod 46 and the backup pad 47 that the symmetry set up, when needs remove, the pneumatic push rod 46 that the symmetry set up outwards stretches out and draws back, effect through third connecting rod 51, the drive removes slider 50 and slides along spout 49, move backup pad 47 downwards, thereby form and use backup pad 47 to be drying extruder jack-up as the backup pad, at this moment, driving motor 5 work drives universal wheel 6 downstream, back pneumatic push rod 46 backward movement drives backup pad 47 rebound shrink, it uses a plurality of universal wheels 6 as the strong point to form, thereby avoid universal wheel 6 direct action subaerial drying extruder jack-up, and then protection mobile device's safety.

Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.

Claims

1. A drying extruder convenient to move comprises a base (1), an extruding device and a drying device, wherein a support (2) is arranged on the base (1), the extruding device is arranged on the support (2), the drying device is arranged on the base (1) and the extruding device, and the drying device is characterized in that an annular fixed seat (3) is fixedly arranged on the base (1), a hole groove (4) is formed in the base (1), guide blocks (9) are fixedly arranged at the bottom of the hole groove (4), the guide blocks (9) are symmetrically arranged, sliding grooves (10) are formed in the guide blocks (9), a moving device is arranged in the hole groove (4) and comprises a driving motor (5), a plurality of symmetrically arranged universal wheels (6) and a roller wheel support (15) for fixedly arranging the universal wheels (6), the driving motor (5) is fixedly arranged on the base (1) at the top of the hole groove (4), the bilateral symmetry of driving motor (5) is provided with locating piece (7), all rotate installation worm (8) on locating piece (7), the transmission is all connected through belt (11) with the output of driving motor (5) in worm (8), all be provided with the mobile unit on worm (8), the mobile unit is including rotating rotation lead screw (12) of installing at hole groove (4) top, fixed mounting and worm (8) intermeshing's turbine (13) are gone up in rotation lead screw (12), be provided with on rotation lead screw (12) rather than transition piece (14) of mutually supporting, transition piece (14) slidable mounting is in spout (10), gyro wheel support (15) fixed mounting is in the bottom of transition piece (14).

2. Drying extruder easy to move according to claim 1, characterized in that the bottom of the ring-shaped holder (3) is fixedly mounted with a cushion pad (16).

3. The drying extruder convenient to move according to claim 2, characterized in that a first groove (17) is formed on the corresponding surface of the rotary screw rod (12) and the base (1), a second groove (18) is formed on the corresponding surface of the base (1) and the rotary screw rod (12), and a rotary ball (19) movably arranged is embedded between the first groove (17) and the second groove (18).

4. The drying extruder convenient to move according to any one of claims 1 to 3, wherein the extruding device comprises an extruding motor (20), an extruding box body (21), and a feeding hopper (22) and an extruding hopper (24) fixedly installed on the extruding box body (21), the extruding box body (21) is fixedly installed on the bracket (2), the extruding motor (20) is fixedly installed on the extruding box body (21), an extruding rotating shaft (23) is fixedly installed at the output end of the extruding motor (20), the extruding rotating shaft (23) is rotatably installed on the extruding box body (21), and an extruding helical blade (25) is fixedly installed on the extruding rotating shaft (23).

5. The drying extruder convenient to move of claim 4, characterized in that the drying device comprises a blower (26), a wind box (27) and a hot air circulating flow assembly, the blower (26) and the wind box (27) are fixedly installed on the base (1), the hot air circulating flow assembly is arranged on the extrusion box body (21), the blower (26) and the wind box (27) are connected through a wind pipe, an electric heating wire (28) is arranged inside the wind box (27), the wind box (27) is communicated with the hot air circulating flow assembly, and the hot air circulating flow assembly is communicated with the extrusion box body (21).

6. The drying extruder convenient to move according to claim 5, wherein the hot air current circulating flow assembly comprises a circulating motor (29) and a motor bracket (30) for fixing the circulating motor (29), the motor bracket (30) is fixedly installed on the extrusion box body (21), a first cylinder body (31) and a second cylinder body (32) are respectively arranged at two sides of the circulating motor (29), the first cylinder body (31) and the second cylinder body (32) are both fixedly installed on the extrusion box body (21), a rotary table (33) is fixedly installed at the output end of the circulating motor (29), an eccentric shaft pin (34) is fixedly installed on the rotary table (33), a first connecting rod (35) and a second connecting rod (36) are rotatably installed on the eccentric shaft pin (34), the first connecting rod (35) and the second connecting rod (36) are oppositely arranged, a first piston rod (37) is rotatably installed at the end of the first connecting rod (35), the first piston (38) of tip fixed mounting of first piston rod (37), first piston (38) slidable mounting is in first cylinder body (31), second connecting rod (36) tip rotates installation second piston rod (39), tip fixed mounting second piston (40) of second piston rod (39), second piston (40) slidable mounting is in second cylinder body (32), bellows (27) and second cylinder body (32) are through first breather pipe (41) intercommunication, second cylinder body (32) and extrusion box (21) are through second breather pipe (42) intercommunication, bellows (27) and first cylinder body (31) are through third breather pipe (43) intercommunication, first cylinder body (31) and extrusion box (21) are through fourth breather pipe (44) intercommunication, all fixed mounting has on first breather pipe (41), second breather pipe (42), third breather pipe (43) and fourth breather pipe (44) and prevents the one-way of air current A valve (45).

7. Drying extruder easy to move according to claim 6, characterized in that the base (1) is provided with a support assembly at its bottom, the supporting component comprises a pneumatic push rod (46) and a supporting plate (47) which are symmetrically arranged, the pneumatic push rod (46) is fixedly arranged at the bottom of the base (1), the end parts of the pneumatic push rod (46) are fixedly provided with connecting blocks (48), the supporting plate (47) is symmetrically provided with moving sliding chutes (49), the moving sliding chutes (49) are internally provided with damping sliding installation moving sliding blocks (50), the movable sliding blocks (50) are in one-to-one correspondence with the connecting blocks (48), the movable sliding blocks (50) are connected with the connecting blocks (48) through third connecting rods (51), the third connecting rod (51) is respectively and rotatably arranged on the movable sliding block (50) and the connecting block (48), and a connecting assembly is arranged between the middle part of the supporting plate (47) and the base (1).

8. Drying extruder convenient to move according to claim 7, characterized in that the connecting assembly comprises a limiting sleeve (52) fixedly mounted on the supporting plate (47) and a guide rod (53) fixedly mounted on the base (1), the guide rod (53) is slidably mounted in the limiting sleeve (52), and a tension spring (54) is connected between the inner wall of the limiting sleeve (52) and the bottom of the guide rod (53).