CN214991301U

CN214991301U - Horizontal roller carbonization furnace

Info

Publication number: CN214991301U
Application number: CN202120706187.2U
Authority: CN
Inventors: 郭成军; 郭朕
Original assignee: Shandong Yulong Machinery Co ltd
Current assignee: Shandong Yulong Machinery Co ltd
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2021-12-03
Anticipated expiration: 2031-04-07

Abstract

The utility model discloses a horizontal roller retort belongs to carbomorphism technical field. The technical scheme is as follows: the automatic feeding device comprises a barrel, wherein a gear transmission mechanism is arranged in the middle of the barrel, a discharge port is formed in the barrel, a discharge mechanism is arranged on the discharge port, a dust cover is arranged on the discharge mechanism, a sealing mechanism is arranged at the end part of a feeding end of the barrel and at the end part of the discharge end of the barrel, a feeding hole is formed in the sealing mechanism at the end part of the feeding end of the barrel, a feeding hopper is arranged on the feeding hole, and a tug wheel mechanism is arranged on the barrel. The utility model has the advantages that: can prevent that outside air from getting into the barrel, alleviate the extension problem after the barrel intensifies, ensure that two wear-resisting sealing rings are pasted all the time really, can solve the tooth phenomenon that stings that the barrel intensifies and warp and arouses, discharge mechanism can block the outside air and get into, has solved the granule burning phenomenon that advances oxygen and cause in the former barrel, the loss greatly reduced of granule, the dust cover can prevent that harmful substance from getting into the air, causes the atmosphere pollution.

Description

Horizontal roller carbonization furnace

Technical Field

The utility model relates to a carbomorphism technical field especially relates to a horizontal roller retort.

Background

The carbonization is to pyrolyze the raw materials under the conditions of oxygen deficiency and high temperature to form a porous carbon structure body. The feed end of the existing carbonization furnace is in butt joint with the barrel, and the barrel is easy to extend after preheating, so that the barrel is not tightly sealed with the feed end, air easily enters the barrel, and the carbonization effect is influenced. Generally, the barrel rotates by means of gear transmission, and the carbonization furnace is influenced by high temperature, so that the barrel is easy to deform to cause tooth biting, the rotating frequency of the barrel is influenced, and the carbonization effect is further influenced. The material is arranged on the barrel to usual retort and is arranged the bin outlet, and the discharge gate exposes in the air and can have partial air admission barrel in, influences the carbomorphism effect, and simultaneously, raw materials such as saw-dust carry out the carbomorphism under high temperature, can produce combustible organic flue gas such as a large amount of naphthalene, benzene, methane among the carbomorphism process, along with arranging going on of material, these organic flue gas can discharge into the atmosphere, cause environmental pollution.

SUMMERY OF THE UTILITY MODEL

The utility model provides a horizontal roller retort to solve the barrel and preheat the extension and cause sealed not tight, the barrel receives high temperature deformation to cause and stings the technical problem that can get into air and polluted environment in the tooth, the discharge process barrel.

The utility model discloses a realize through following measure:

horizontal roller retort, including the barrel, be provided with gear drive in the middle of the barrel, be provided with the discharge gate on the barrel, be provided with discharge mechanism on the discharge gate, the last dust cover that is provided with of discharge mechanism, the barrel includes feed end and discharge end, the feed end tip of barrel all is provided with sealing mechanism with the tip of discharge end, the feed end tip of barrel be provided with the feed inlet on the sealing mechanism, be provided with the feeder hopper on the feed inlet, be provided with tow boat mechanism on the barrel, tow boat mechanism symmetry sets up gear drive both sides.

Preferably, discharge mechanism includes the spiral cavity, the winding of spiral cavity is in discharge gate department, the spiral cavity includes shutoff end and opening end, and the shutoff end of spiral cavity is provided with the connecting hole, the connecting hole with the discharge gate link up, cup joint on the spiral cavity the dust cover, dust cover one end is provided with the dust exhaust mouth, and the other end is provided with the blanking mouth, the blanking mouth with the opening end of spiral cavity is connected.

Preferably, the sealing mechanism of barrel feed end tip with the sealing mechanism structure of barrel discharge end tip is the same, sealing mechanism includes the fixing base, the fixing base is hollow circular cylinder, fixing base one end and connecting pipe fixed connection, the other end are provided with the sliding seat, the sliding seat is hollow circular cylinder, a sliding seat pot head is established the fixing base is inboard, the sliding seat with be provided with the spring between the fixing base, the spring setting is in the fixing base with the sliding seat cup joints the department, the sliding seat other end with the fixed connection of barrel, and the junction is provided with the sealing ring.

Preferably, the connecting pipe comprises a connecting pipe on the tail furnace and a connecting pipe on the combustion furnace, one end of a fixed seat at the end part of the feeding end of the barrel is fixedly connected with the connecting pipe on the tail furnace, the fixed seat at the end part of the feeding end of the barrel is provided with the discharge port, a sliding seat at the end part of the feeding end of the barrel is fixedly connected with the feeding end of the barrel, one end of the fixed seat at the end part of the discharging end of the barrel is fixedly connected with the connecting pipe on the combustion furnace, and a sliding seat at the end part of the discharging end of the barrel is fixedly connected with the discharging end of the barrel.

Preferably, be provided with retainer plate A on the fixing base, the equipartition is provided with through-hole A on the retainer plate A, be provided with pin A in the through-hole A, be provided with retainer plate B on the sliding seat, the equipartition is provided with through-hole B on the retainer plate B, be provided with pin B in the through-hole B, the spring sets up retainer plate A with in the retainer plate B, spring one end with pin B fixed connection, the other end with pin A fixed connection.

Preferably, the sealing ring includes sealing ring one and sealing ring two, the feed end and the discharge end of barrel all are provided with the barrel flange, be provided with the sliding seat flange on the sliding seat, the sliding seat flange with the barrel flange is corresponding, the barrel flange with a sealing ring fixed connection, the sliding seat flange with two sealing ring fixed connection, sealing ring one with two sealing ring connections.

Preferably, the tug mechanism comprises a tug frame, the tug frame comprises a base, an open type hoop is arranged on the upper portion of the base, a sealing structure is formed between the hoop and the upper end face of the base, a groove is formed in the hoop, a rolling ring is arranged in the groove, a bracket is fixedly arranged on the inner side of the rolling ring, a ferrule is arranged on the bracket, the inner diameter of the ferrule is equal to the outer diameter of the cylinder, a base frame is arranged at the joint of the hoop and the base, a tug is arranged on the base frame, and the outer side face of the tug is connected with the outer side face of the rolling ring.

Preferably, gear drive includes the spacing collar, be provided with the ring gear in the spacing collar, be provided with the flexure strip on the ring gear, flexure strip one end with ring gear fixed connection, the other end is visited the ring gear to the inboard extension that extends of ring gear forms the extension, the fixed rotatory circle that is provided with of extension, the internal diameter of rotatory circle equals the external diameter of barrel, the ring gear bottom is provided with the base, be provided with the gear on the base, the gear with the ring gear meshing, base one side is provided with the speed reducer, the input shaft and the motor output shaft of speed reducer, set up on the output shaft of speed reducer the gear.

The utility model has the advantages that:

1. sealing mechanism can prevent that outside air from getting into the barrel, cause the granule burning, alleviate the extension problem after the barrel intensifies, ensure that two wear-resisting sealing rings are pasted all the time, gear drive drives the barrel rotatory, and adopt the flexure strip in the gear drive, can solve the tooth phenomenon of stinging that the barrel intensifies and warp and arouses, discharge mechanism can block outside air and get into, the granule burning phenomenon that the oxygen led to the fact is advanced in having solved the former barrel, the loss greatly reduced of granule, the dust cover can prevent that harmful object from getting into the air, cause the atmosphere pollution.

2. The blanking mouth of dust cover is connected with the open end of spiral cavity, can solve because rotatory inertia causes the problem of opening department ejection of compact raise dust to the dust exhaust mouth of dust cover can collect the dust and can collect harmful gas.

3. The sliding seat in the sealing mechanism can move along the axial direction of the fixing seat, can move, effectively solves the technical problem that sealing is not tight due to the fact that the cylinder body is stretched in the preheating stage, can effectively guarantee that the first sealing ring and the second sealing ring are tightly attached, and prevents air from entering the cylinder body.

4. The dragging wheel supports the rolling ring, so that the barrel can be effectively prevented from deforming, and the dragging wheel mechanisms are arranged on two sides of the gear transmission mechanism, so that the two ends of the barrel can be supported, and the force is exerted more uniformly.

5. The gear transmission mechanism can drive the barrel to rotate, and can enable particles in the barrel to collide with each other, so that the particles in the barrel are controlled to keep reasonable length and size.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the gear transmission mechanism and the barrel body.

Fig. 3 is a partially enlarged view of a portion a of fig. 2.

Fig. 4 is a schematic structural diagram of the gear transmission mechanism.

Fig. 5 is a schematic structural diagram of the matching of the discharging mechanism and the cylinder.

Fig. 6 is a schematic structural diagram of the matching of the cylinder body and the discharging mechanism after the sealing mechanism at the end part of the discharging end of the cylinder body is removed.

Fig. 7 is a schematic view of the sealing mechanism engaged with the tube.

Fig. 8 is a partial enlarged view of fig. 7 at B.

Fig. 9 is a schematic structural diagram of the barrel body and the tug mechanism in cooperation.

Fig. 10 is a partial enlarged view of fig. 9 at C.

Wherein the reference numerals are: 1. a barrel; 11. a cylinder flange; 2. a gear transmission mechanism; 21. a limiting ring; 22. a ring gear; 23. a rotating ring; 24. a base; 25. a gear; 26. a speed reducer; 27. an elastic sheet; 3. a discharge port; 4. a discharging mechanism; 41. a spiral cavity; 5. a dust cover; 51. a discharge outlet; 52. a blanking port; 6. a sealing mechanism; 61. a fixed seat; 62. a sliding seat; 621. a sliding seat flange; 63. a spring; 64. a seal ring; 641. a first sealing ring; 642. a second sealing ring; 65. a fixed ring A; 66. a fixed ring B; 7. a feed hopper; 8. a tug mechanism; 81. a tow wheel frame; 811. a base; 812. a hoop; 82. a rolling ring; 83. a bracket; 84. a ferrule; 85. a base frame; 86. a tug boat.

Detailed Description

In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.

Referring to fig. 1: the utility model relates to a horizontal roller retort, including barrel 1, firebrick is laid to barrel 1 inside, and the barrel sets gradually low temperature, medium temperature and high temperature zone from the feed end to the discharge end, and low temperature, medium temperature and high temperature zone use the firebrick of different models, and low temperature section (350) add one's complement of 450 ℃ C.) is for preheating the plastic section, and after the granule that differs in size got into this region, granule surface hardening, through the rotation of barrel, the mutual collision of granule, granule length control is between 1.2-1.5 times of granule diameter, produces granule powder in the process of collision; the middle temperature (450-; the high temperature (650-.

See fig. 2-4: the middle of the cylinder body 1 is provided with a gear transmission mechanism 2:

gear drive 2 includes spacing collar 21, be provided with ring gear 22 in the spacing collar 21, be provided with flexure strip 27 on the ring gear 22, flexure strip 27 one end and ring gear 22 fixed connection, the other end stretches out ring gear 22 and extends to ring gear 22 inboard and form the extension, the fixed swivel becket 23 that is provided with of extension, the internal diameter of swivel becket 23 equals the external diameter of barrel 1, ring gear 22 bottom is provided with base 24, be provided with gear 25 on the base 24, gear 25 and ring gear meshing, base 24 one side is provided with speed reducer 26, the input shaft and the motor output shaft of speed reducer are connected, set up gear 25 on the output shaft of speed reducer 26.

The output shaft of the motor is connected with the input shaft of the speed reducer, the output shaft of the motor rotates to drive the input shaft of the speed reducer to rotate, thereby driving the output shaft of the speed reducer to rotate and driving the gear to rotate, the gear rotates and drives the gear ring to rotate, because the middle section of the cylinder body is a carbonization section, wherein the temperature is 450 ℃ and 650 ℃, therefore, the cylinder body can deform at the middle temperature section of the middle section, when the cylinder body is deformed, the stress of the rotating ring is uneven in the rotating process, the rotating ring can deviate from the position of the axis, the stress of the rotating ring is uneven, the gear can be driven to be unevenly stressed, therefore, the tooth biting phenomenon can occur, the elastic sheet is arranged between the rotating ring and the gear ring, when the force of the rotating ring is not uniform, the elastic sheet is pressed to deform, the elastic piece needs to restore to the original shape, so that a reaction force is given to the rotating ring, the rotating ring is pushed to restore to the original state, and the tooth biting phenomenon is avoided.

See fig. 5 and 6: a discharge port 3 is formed in the barrel body 1, a discharge mechanism 4 is arranged on the discharge port 3, and a dust cover 5 is arranged on the discharge mechanism 4.

The discharging mechanism 4 comprises a spiral cavity body 41, the spiral cavity body 41 is wound at the discharging port 3, the spiral cavity body 41 comprises a plugging end and an open end, the plugging end of the spiral cavity body 41 is provided with a connecting hole, the connecting hole is communicated with the discharging port 3, the spiral cavity body 41 is sleeved with a dust cover 5, one end of the dust cover 5 is provided with a dust exhaust port 51, the other end of the dust cover is provided with a blanking port 52, and the blanking port 52 is connected with the open end of the spiral cavity body 41.

The discharge port is formed in the cylinder body, the spiral cavity is formed in the discharge port, the spiral cavity is preferably three circles, and at least two circles of spiral cavities are filled with particles along with rotation of the cylinder body, so that air is difficult to enter the furnace body from the opening through the connecting hole and the discharge port, the entering of external air is blocked, the problem that the particle combustion phenomenon is caused by oxygen entering the cylinder body in the prior art is solved, and the loss of the particles is greatly reduced.

Cup joint the dust cover on spiral cavity, there are three reasons, firstly the granule is raised at the high temperature section and is fallen and beat, and consequently the granule has initial velocity entering uncovered formula, because the barrel is rotatory again, consequently the granule that has initial velocity has centrifugal force in uncovered department, consequently with the blanking mouth and the uncovered connection of dust excluding hood this moment, the purpose prevents that the granule from splashing. Secondly, during the medium temperature carbonization, a large amount of combustible organic flue gas such as naphthalene, benzene, methane and the like can be generated in the cylinder body, the organic flue gas can be discharged through the dust exhaust port, and because the particles collide with each other at low temperature to generate powder, the powder is also discharged from the dust exhaust port, harmful gas and particle powder are treated at the dust exhaust port.

See fig. 7 and 8: the barrel 1 comprises a feeding end and a discharging end, the end part of the feeding end of the barrel 1 and the end part of the discharging end are both provided with a sealing mechanism 6, a feeding hole is formed in the sealing mechanism 6 of the end part of the feeding end of the barrel 1, and a feeding hopper 7 is arranged on the feeding hole.

The sealing mechanism of 1 feed end tip of barrel is the same with the sealing mechanism structure of 1 discharge end tip of barrel, sealing mechanism 6 includes fixing base 61, fixing base 61 is hollow cylinder, fixing base 61 one end and connecting pipe fixed connection, the other end is provided with sliding seat 62, sliding seat 62 is hollow cylinder, a pot head of sliding seat 62 is established at the fixing base 61 inboard, be provided with spring 63 between sliding seat 62 and the fixing base 61, spring 63 sets up and cup joints the department at fixing base 61 and sliding seat 62, the sliding seat 62 other end and barrel 1's fixed connection, and the junction is provided with sealing ring 64.

The connecting pipe includes the connecting pipe on the afterbody stove and fires the connecting pipe on the burning furnace, the fixing base 61 one end of 1 feed end tip of barrel and the connecting pipe fixed connection on the afterbody stove, set up the discharge gate on the fixing base of 1 feed end tip of barrel, the sliding seat 62 and the 1 feed end fixed connection of barrel 1 feed end tip of barrel, the fixing base one end of 1 discharge end tip of barrel and the connecting pipe fixed connection who fires on the burning furnace, the sliding seat and the 1 discharge end fixed connection of barrel 1 discharge end tip.

Be provided with retainer plate A65 on the fixing base 61, the equipartition is provided with through-hole A on the retainer plate A65, is provided with pin A in the through-hole A, is provided with retainer plate B66 on the sliding seat 62, and the equipartition is provided with through-hole B on the retainer plate B66, is provided with pin B in the through-hole B, and the spring setting is in retainer plate A and retainer plate B, spring one end and pin B fixed connection, the other end and pin A fixed connection.

The sealing ring 64 comprises a first sealing ring 641 and a second sealing ring 642, the feeding end and the discharging end of the cylinder 1 are both provided with cylinder flanges 11, the sliding seat 62 is provided with a sliding seat flange 621, the sliding seat flange corresponds to the cylinder flanges, the cylinder flanges 11 are fixedly connected with the first sealing ring 641, the sliding seat flange 621 is fixedly connected with the second sealing ring 642, and the first sealing ring 641 is connected with the second sealing ring 642.

Because the barrel can extend after preheating, for example the initial time barrel is 10 meters long, become 11 meters long when preheating the back barrel, in order to guarantee the distance between the barrel fixing base, consequently, after the barrel is 11 meters, the barrel drives the rotatory sealing ring two that extrudees on the sliding seat of sealing ring one, at this in-process, the bubble between the sealing ring box sealing ring two is crowded away, forms vacuum state between the two, under atmospheric pressure, sealing ring one and sealing ring two closely laminate, can prevent that the air from getting into the barrel.

Because the cylinder body extends to drive the first sealing ring to extrude the second sealing ring, the sliding seat moves towards the direction of the fixed seat, the spring is compressed at the moment, the extension problem of the cylinder body after temperature rise can be relieved by the spring, and the two wear-resistant sealing rings are ensured to be attached to each other all the time.

See fig. 9 and 10: the cylinder body 1 is provided with a tug mechanism 8, and the tug mechanisms 8 are symmetrically arranged on two sides of the gear transmission mechanism 2.

The tug mechanism 8 comprises a tug frame 81, the tug frame 81 comprises a base 811, an open type hoop 812 is arranged on the upper portion of the base 811, a sealing structure is formed between the hoop 812 and the upper end face of the base 811, a groove is formed in the hoop 812, a rolling ring 82 is arranged in the groove, a bracket 83 is fixedly arranged on the inner side of the rolling ring 82, a ferrule 84 is arranged on the bracket 83, the inner diameter of the ferrule 84 is equal to the outer diameter of the cylinder 1, a base frame 85 is arranged at the joint of the hoop and the base, a tug 86 is arranged on the base frame 85, and the outer side face of the tug 86 is connected with the outer side face of the rolling ring 82.

Because the temperature in the cylinder is higher, the cylinder can deform, the cylinder deforms, the stress of the ferrule is uneven, the rolling ring is driven to be unevenly stressed, and the rolling ring can deviate in the axial direction, so that the dragging wheel can support the rolling ring to force the axis of the rolling ring to be always in the original position, and the normal rotation of the cylinder is ensured,

The technical features that the utility model has not been described can be realized through or adopt prior art, and no longer give unnecessary details here, and of course, the above-mentioned explanation is not right the utility model discloses a restriction, the utility model discloses also not only be limited to the above-mentioned example, ordinary skilled person in this technical field is in the utility model discloses a change, modification, interpolation or replacement made in the essential scope also should belong to the utility model discloses a protection scope.

Claims

1. Horizontal roller retort, including barrel (1), its characterized in that, be provided with gear drive (2) in the middle of barrel (1), be provided with discharge gate (3) on barrel (1), be provided with discharge mechanism (4) on discharge gate (3), be provided with dust cover (5) on discharge mechanism (4), barrel (1) includes feed end and discharge end, the feed end tip of barrel (1) all is provided with sealing mechanism (6) with the tip of discharge end, the feed end tip of barrel (1) be provided with the feed inlet on sealing mechanism (6), be provided with feeder hopper (7) on the feed inlet, be provided with tow boat mechanism (8) on barrel (1), tow boat mechanism (8) symmetry sets up gear drive (2) both sides.

2. The horizontal roller carbonization furnace according to claim 1, wherein the discharging mechanism (4) comprises a spiral cavity (41), the spiral cavity (41) is wound at the discharging port (3), the spiral cavity (41) comprises a plugging end and an open end, the plugging end of the spiral cavity (41) is provided with a connecting hole, the connecting hole is communicated with the discharging port (3), the spiral cavity (41) is sleeved with the dust cover (5), one end of the dust cover (5) is provided with a dust exhaust port (51), the other end of the dust cover is provided with a blanking port (52), and the blanking port (52) is connected with the open end of the spiral cavity (41).

3. The horizontal drum carbonization furnace according to claim 1, characterized in that the sealing mechanism at the feed end of the drum (1) has the same structure as the sealing mechanism at the discharge end of the drum (1), the sealing mechanism (6) comprises a fixed seat (61), the fixed seat (61) is a hollow cylinder, one end of the fixed seat (61) is fixedly connected with the connecting pipe, the other end is provided with a sliding seat (62), the sliding seat (62) is a hollow cylinder, one end of the sliding seat (62) is sleeved on the inner side of the fixed seat (61), a spring (63) is arranged between the sliding seat (62) and the fixed seat (61), the spring (63) is arranged at the sleeving position of the fixed seat (61) and the sliding seat (62), the other end of the sliding seat (62) is fixedly connected with the cylinder body (1), and a sealing ring (64) is arranged at the joint.

4. The horizontal drum carbonization furnace as claimed in claim 3, wherein the connecting pipes comprise a connecting pipe on the tail furnace and a connecting pipe on the combustion furnace, one end of the fixed seat (61) at the feed end of the drum (1) is fixedly connected with the connecting pipe on the tail furnace, the discharge port is arranged on the fixed seat at the feed end of the drum (1), the sliding seat (62) at the feed end of the drum (1) is fixedly connected with the feed end of the drum (1), one end of the fixed seat at the discharge end of the drum (1) is fixedly connected with the connecting pipe on the combustion furnace, and the sliding seat at the discharge end of the drum (1) is fixedly connected with the discharge port of the drum (1).

5. The horizontal roller carbonization furnace as claimed in claim 3, wherein a fixed ring A (65) is arranged on the fixed seat (61), through holes A are uniformly distributed on the fixed ring A (65), a pin A is arranged in the through hole A, a fixed ring B (66) is arranged on the sliding seat (62), through holes B are uniformly distributed on the fixed ring B (66), a pin B is arranged in the through holes B, the spring is arranged in the fixed ring A and the fixed ring B, one end of the spring is fixedly connected with the pin B, and the other end of the spring is fixedly connected with the pin A.

6. The horizontal roller carbonization furnace according to claim 3, wherein the sealing ring (64) comprises a first sealing ring (641) and a second sealing ring (642), the feed end and the discharge end of the cylinder (1) are both provided with cylinder flanges (11), the sliding seat (62) is provided with a sliding seat flange (621), the sliding seat flange corresponds to the cylinder flange, the cylinder flange (11) is fixedly connected with the first sealing ring (641), the sliding seat flange (621) is fixedly connected with the second sealing ring (642), and the first sealing ring (641) is connected with the second sealing ring (642).

7. Horizontal drum retort according to claim 1, characterized in that the tug mechanism (8) comprises a tug carriage (81), the wheel dragging frame (81) comprises a base (811), an open hoop (812) is arranged at the upper part of the base (811), a sealing structure is formed between the hoop (812) and the upper end surface of the base (811), grooves are arranged in the hoop (812), a rolling ring (82) is arranged in the groove, a bracket (83) is fixedly arranged at the inner side of the rolling ring (82), a ferrule (84) is arranged on the bracket (83), the inner diameter of the ferrule (84) is equal to the outer diameter of the cylinder body (1), a base frame (85) is arranged at the joint of the hoop and the base, a tug (86) is arranged on the base frame (85), the outer side surface of the tug (86) is connected with the outer side surface of the rolling ring (82).

8. The horizontal roller carbonization furnace according to claim 1, wherein the gear transmission mechanism (2) comprises a limiting ring (21), a gear ring (22) is arranged in the limiting ring (21), an elastic sheet (27) is arranged on the gear ring (22), one end of the elastic sheet (27) is fixedly connected with the gear ring (22), the other end of the elastic sheet extends out of the gear ring (22) and extends towards the inner side of the gear ring (22) to form an extension part, the extension part is fixedly provided with a rotating ring (23), the inner diameter of the rotating ring (23) is equal to the outer diameter of the barrel (1), a base (24) is arranged at the bottom of the gear ring (22), a gear (25) is arranged on the base (24), the gear (25) is engaged with the gear ring, a speed reducer (26) is arranged on one side of the base (24), and an input shaft of the speed reducer is connected with an output shaft of a motor, the gear (25) is arranged on an output shaft of the speed reducer (26).