Soaking solution spraying mechanism based on wet tissue processing

Abstract

The utility model relates to a soak solution spraying mechanism based on wet tissue processing, which comprises a box sleeve erected by support legs, and a traction mechanism and a spraying mechanism are arranged in the box sleeve in a penetrating manner; the traction mechanism comprises a hollow beam which is transversely and symmetrically clamped in the box sleeve, a plurality of rotatable traction shafts are longitudinally inserted into the front end and the rear end of the hollow beam, driving wheels are transversely and symmetrically arranged on the traction shafts in a sleeving mode, driven chains are connected to the traction shafts in a sleeving mode, rotary belts are transversely fixed between the chains, and a transmission motor is connected to the front end of the traction shaft; the spraying mechanism comprises a soaking cabin erected between the supporting legs, soaking liquid for wet tissues is stored in the soaking cabin, an S-shaped drainage cavity is formed in the side of the soaking cabin in an upward supporting mode, an upper spraying pipe and a lower spraying pipe which are the same as the traction shaft in width are arranged on the upper portion and the lower portion of a rotating belt in an extending mode respectively, and the soaking liquid can be sprayed in the opposite direction along with the wet tissues on the rotating belt; the wet tissue spraying device can effectively reduce spraying blind areas, ensure that wet tissues are fully infiltrated in automatic production, and improve the wettability uniformity of products.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of spraying device, especially based on the soaking liquid spraying mechanism of wet paper towel processing. BACKGROUND

[0002] Wet paper towel is widely used in daily life as a cleaning and nursing product, and the stability of its production process and the uniformity of product quality directly affect consumer experience and market competitiveness. In the production process of wet paper towel, the spraying soaking process is the core link that determines product quality, and its main role is to uniformly spray the soaking liquid containing functional components such as antibacterial agents and moisturizing agents onto the substrate, so as to ensure that the wet paper towel has good antibacterial property, moisture and use comfort. However, the existing spraying technology still has significant defects in industrial application, especially the problem of uneven coverage of the spraying soaking liquid, which has become a key bottleneck restricting the high-quality development of the industry.

[0003] At present, the wet paper towel production line generally adopts an automatic spraying system, which mainly relies on a linear spraying mode of directional injection to make the spraying liquid uniformly distributed on the surface of the substrate. This mode can theoretically realize directional coverage, but in a high-speed production environment, the contact time of the substrate with the spraying liquid is extremely short, only in the order of milliseconds, which makes it difficult for the spraying liquid to fully penetrate into the material. Especially when there are fine wrinkles or uneven fiber density on the surface of the substrate, the injection liquid flow is difficult to penetrate into the material microstructure, resulting in insufficient soaking depth in some areas, and further affecting the overall moisture and antibacterial performance of the wet paper towel. In addition, the continuous movement of the substrate during the spraying process further aggravates the problem of uneven liquid coverage. Because the substrate is affected by air resistance and its own tension in a high-speed running state, local turbulent barriers are easily formed at the edge of the substrate, making it difficult for the spraying liquid to effectively adhere and penetrate. This uneven liquid distribution directly leads to differences in the antibacterial performance and use feel of the wet paper towel, affecting the overall qualification rate of the product. Therefore, a soaking liquid spraying mechanism based on wet paper towel processing is needed. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies in the prior art, the utility model provides a soaking liquid spraying mechanism based on wet paper towel processing, and the specific technical solutions are as follows:

[0005] The utility model provides a soaking liquid spraying mechanism based on wet paper towel processing, which comprises a box sleeve supported by legs, a traction mechanism and a spraying mechanism are arranged in the box sleeve for spraying and processing wet paper towel; the traction mechanism comprises a hollow beam symmetrically clamped in the box sleeve, a plurality of rotatable traction shafts are longitudinally inserted into the front and rear ends of the hollow beam, a driving wheel is symmetrically sleeved on the traction shafts in the transverse direction, a driven chain is connected to the driving wheel, a rotary belt is fixed between the chains in the transverse direction, and a transmission motor is connected to the end of the front traction shaft to drive the wet paper towel on the rotary belt to pass through the box sleeve along with the driven chain.

[0006] The spraying mechanism comprises a soaking cabin arranged between the supporting legs, wherein the soaking liquid for wet wipes is stored, the soaking cabin is provided with an S-shaped drainage cavity upwardly and laterally, and upper and lower spraying pipes with the same width as the traction shaft are arranged on the upper and lower rotary belts respectively, so that the soaking liquid can be sprayed opposite to the wet wipes on the rotary belt.

[0007] As a preferred technical scheme of the utility model, the drainage cavity is provided with a side spraying pipe coinciding with the plane of the hollow beam, and the side spraying pipe is provided with a spraying hole, so that the soaking liquid can be released in a atomized state.

[0008] As a preferred technical scheme of the utility model, the rear end traction shaft is sleeved with a panel at both ends, the panel is clamped in the hollow beam and can be longitudinally slidably locked, and the panel is used for adjusting the tightness of the driven chain.

[0009] As a preferred technical scheme of the utility model, the constant temperature mechanism is vertically inserted into the box sleeve, the constant temperature mechanism comprises a vortex pipe connected to the fan, the top of the vortex pipe is connected to a warm air outlet penetrating through the box sleeve, and a heating wire is attached to the warm air outlet, so that the reaction temperature in the box sleeve can be maintained during the whole process of spraying the wet wipes.

[0010] As a preferred technical scheme of the utility model, the box sleeve is vertically provided with a temperature insulation curtain at the outlet of the rear end traction shaft, so that the temperature difference of the wet wipes leaving the box sleeve is reduced.

[0011] As a preferred technical scheme of the utility model, the top of the box sleeve is hingedly connected with a maintenance door which is opened opposite to each other, so that the maintenance door can be opened outwardly for instant viewing.

[0012] As a preferred technical scheme of the utility model, the front end traction shaft is connected with a steering reducer, and the steering reducer is steeringly connected with the transmission motor, so that the outward interference of the transmission motor is reduced.

[0013] The utility model has the advantages of:

[0014] 1. Improve the uniformity of wet wipe spraying: the mechanism adopts an upper and lower opposite spraying mode, and is provided with upper and lower spraying pipes with the same width as the traction shaft, so that the spraying liquid can uniformly cover the wet wipe base material from multiple angles. Compared with the traditional one-way spraying mode, the design can effectively reduce the spraying blind area, ensure that each area of the wet wipe can be fully soaked during high-speed operation, and improve the uniformity of the wetting degree of the product.

[0015] 2. Enhance the penetration depth of the spray liquid: By adding a soaking cabin between the legs and setting an S-shaped drainage cavity laterally, the mechanism can maintain the stable supply of spray liquid, so that the liquid can fully penetrate into the fiber structure of the wet paper towel during spraying. The design of the S-shaped drainage cavity helps to adjust the liquid flow direction, reduce the liquid rebound loss caused by turbulent effect in high-speed production process, thereby improving the utilization rate of spray liquid and making the antibacterial components of the soaking liquid of the wet paper towel more evenly distributed in the substrate.

[0016] 3. Improve the soaking effect of the edge area of the wet paper towel: The traditional spraying method easily forms a soaking blind area at the edge of the substrate, resulting in lower humidity in the edge area than in the center area. The mechanism optimizes the width of the spray pipe to be the same as the width of the traction shaft, and combines the stable conveying effect of the rotary belt, so that the spray liquid can more evenly cover the entire wet paper towel substrate, including the edge area. This not only improves the uniformity of the wetness of the wet paper towel as a whole, but also improves the antibacterial performance and use comfort of the product.

[0017] 4. Reduce liquid waste and improve production efficiency: The combination design of the soaking cabin and the spray pipe makes the spray liquid circulate in the closed loop system, reducing liquid waste. At the same time, the traction mechanism adopts the combination of driving wheel and driven chain to ensure stable conveying of the wet paper towel during spraying, avoiding uneven spraying caused by substrate shaking and deviation. This precise control of the spraying method not only improves the product yield, but also reduces production cost and improves production efficiency.

[0018] 5. Adapt to high-speed production needs and improve product quality stability: The mechanism uses a motor-driven traction system to ensure stable spraying effect of the wet paper towel at high speed. Compared with the traditional single-direction spraying method, this mechanism can adapt to the high-speed operation requirements of modern production lines, ensuring consistent quality standards of the wet paper towel in high-efficiency production, and improving the market competitiveness of the product. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The overall structure schematic diagram of the utility model is shown;

[0020] Figure 2 The structure schematic diagram of the spraying mechanism combined with the traction mechanism in the utility model is shown;

[0021] Figure 3 The three-dimensional structure schematic diagram of the traction mechanism in the utility model is shown;

[0022] Figure 4 The three-dimensional structure schematic diagram of the constant temperature mechanism in the utility model is shown;

[0023] As shown in the figure: 1, leg; 2, box cover; 21, access door; 22, temperature curtain; 3, traction mechanism; 31, transmission motor; 32, steering reducer; 33, traction shaft; 331, driving wheel; 34, driven chain; 341, rotary belt; 35, hollow beam; 36, panel; 4, spraying mechanism; 41, soaking cabin; 42, lower spray pipe; 43, upper spray pipe; 44, side spray pipe; 45, drainage cavity; 5, constant temperature mechanism; 51, fan; 52, vortex pipe; 53, air outlet. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the following will be further described in detail. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0025] Embodiment one

[0026] To solve the technical problems in the background art, the following soaking liquid spraying mechanism based on wet tissue processing is given:

[0027] In combination with Figures 1-3 As shown in the figure, the soaking liquid spraying mechanism 4 based on wet tissue processing, comprising a box cover 2 erected by a leg 1, a traction mechanism 3 and a spraying mechanism 4 are arranged in the box cover 2, which is used for the spraying processing of wet tissue; the traction mechanism 3 comprises a hollow beam 35 symmetrically clamped in the box cover 2, a plurality of rotatable traction shafts 33 are longitudinally inserted into the front and rear ends of the hollow beam 35, a driving wheel 331 is symmetrically sleeved on the traction shaft 33, a driven chain 34 is sleeved on the driving wheel 331, a rotary belt 341 is fixed transversely between the chains, and a transmission motor 31 is connected to the end of the front traction shaft 33, which can drive the wet tissue on the rotary belt 341 to pass through the box cover 2 along with the driven chain 34.

[0028] The spraying mechanism 4 comprises a soaking cabin 41 arranged between the legs 1, which stores the soaking liquid for wet tissue, and the soaking cabin 41 is laterally provided with an S-shaped drainage cavity 45, and the upper and lower ends of the rotary belt 341 are respectively provided with upper and lower spray pipes 43 and 42 which are the same width as the traction shaft 33, which can spray the soaking liquid to the wet tissue on the rotary belt 341 through the opposite direction.

[0029] Please refer to the drawings in the description Figures 1-3The utility model provides a kind of first embodiment of soaking liquid spraying mechanism 4 based on wet paper towel processing, in this embodiment, the soaking liquid spraying mechanism 4 is mainly composed of box cover 2, box cover 2 is erected by support leg 1, and traction mechanism 3 and spraying mechanism 4 are arranged in it, to realize the spraying processing of wet paper towel. Traction mechanism 3 includes hollow beam 35 symmetrically clamped in box cover 2, and a plurality of rotatable traction shafts 33 are inserted longitudinally in the front and rear ends of hollow beam 35, and driving wheel 331 is symmetrically sleeved on traction shaft 33, and driven chain 34 is sleeved on driving wheel 331. To ensure the stable delivery of wet paper towel, rotary belt 341 is fixed laterally between driven chain 34, and the front end of traction shaft 33 is connected with transmission motor 31 to drive the wet paper towel on rotary belt 341 to pass through box cover 2 with driven chain 34, realize the effect of continuous delivery.

[0030] In this embodiment, spraying mechanism 4 is arranged between support legs 1, and includes soaking cabin 41 for storing wet paper towel soaking liquid. To optimize the flow path of liquid, soaking cabin 41 is laterally provided with S-shaped drainage cavity 45 to guide the circulating flow of soaking liquid. To ensure that wet paper towel is fully sprayed during delivery, spraying mechanism 4 is provided with upper spray pipe 43 and lower spray pipe 42 above and below rotary belt 341 respectively, and the width of upper spray pipe 43 and lower spray pipe 42 is the same as that of traction shaft 33, so that the spraying liquid can uniformly cover the entire width range of wet paper towel. When wet paper towel passes through spraying mechanism 4 under the traction of rotary belt 341, upper spray pipe 43 and lower spray pipe 42 can synchronously and oppositely spray soaking liquid, so that wet paper towel can be fully soaked during high-speed movement.

[0031] Further, in this embodiment, the delivery path of rotary belt 341 matches the arrangement of spraying mechanism 4, to ensure that wet paper towel maintains stable running state when passing through the spraying area, avoiding uneven spraying caused by shaking or deviation. In addition, the design of S-shaped drainage cavity 45 enables the spraying liquid to maintain stable flow state during spraying, reduces liquid rebound loss caused by high-speed spraying, and improves the utilization rate of spraying liquid. Through the optimized design of the above structure, this embodiment can realize efficient spraying processing of wet paper towel, and ensure that wet paper towel obtains uniform spraying soaking effect during production.

[0032] Embodiment two

[0033] Combined Figures 2-3 As shown in the above embodiment, this embodiment further gives the following contents:

[0034] In this embodiment, the drainage cavity 45 is inwardly provided with a side spray pipe 44 coinciding with the plane of the hollow beam 35, and the side spray pipe 44 is provided with spray holes for directional release of atomized soaking liquid.

[0035] The rear end traction shaft 33 is sleeved with a panel 36 at both ends, which is clamped in the hollow beam 35 and can be longitudinally slidably locked, used for adjusting the tightness of the driven chain 34.

[0036] Please refer to the description of the drawings Figures 2-3 The second embodiment of the soaking liquid spraying mechanism 4 based on wet tissue processing is provided, in which the spraying mechanism 4 comprises a drainage cavity 45, the drainage cavity 45 is provided with a side spray pipe 44 extending inward, the arrangement of the side spray pipe 44 is such that the plane of the side spray pipe 44 coincides with the plane of the hollow beam 35, and the side spray pipe 44 is uniformly provided with spray holes, so as to release the atomized soaking liquid in a directional manner. When the wet tissue is driven by the traction mechanism 3 to pass through the spraying area, the side spray pipe 44 can spray the atomized liquid to the side surface of the wet tissue, so that the spraying liquid can more uniformly cover the surface of the wet tissue and penetrate into the fibers.

[0037] Preferably, in order to ensure the stable operation of the driven chain 34, in this embodiment, the rear end traction shaft 33 is sleeved with a panel 36 at both ends, the structure of the panel 36 is designed to be capable of being clamped in the hollow beam 35 and longitudinally slidably locked. This structure enables the panel 36 to adjust the position within a certain range, thereby realizing the adjustment of the tightness of the driven chain 34. By sliding the position of the panel 36, the conveying demand under different production states can be adapted, so as to ensure that the driven chain 34 maintains appropriate tension during operation, and avoid the unstable conveying problem caused by the chain being too loose or too tight.

[0038] Further, in this embodiment, in order to optimize the release effect of the spraying liquid, the spray holes of the side spray pipe 44 are designed to be uniformly distributed, and the opening and closing state of the spray holes can be adjusted according to the production demand, so that the spraying angle and the spraying amount of the spraying liquid can be accurately controlled. In addition, the sliding and locking mode of the panel 36 in the hollow beam 35 adopts a mechanical limiting structure, so that the panel 36 can be stably fixed after adjustment, and the loosening or deviation during long-time operation is avoided. Through the optimization design of the above structure, this embodiment can ensure that the wet tissue obtains more uniform soaking effect during the spraying processing, and at the same time, the operation stability of the traction mechanism 3 is improved.

[0039] Embodiment three

[0040] Combined Figures 1-4 As shown in the above embodiments, the following contents are further given in this embodiment:

[0041] In this embodiment, the constant temperature mechanism 5 is vertically inserted into the box sleeve 2, which comprises a vortex tube 52 connected to a fan 51, and a warm air outlet 53 penetrating through the box sleeve 2 is connected to the top of the vortex tube 52, and a heating wire is attached to the inside of the warm air outlet 53, so as to maintain the reaction temperature in the box sleeve 2 during the whole spraying process of the wet tissue.

[0042] The temperature insulation curtain 22 is vertically arranged at the outlet of the rear traction shaft 33 of the box cover 2, so as to reduce the temperature difference of the wet paper towel when it leaves the box cover 2.

[0043] The maintenance door 21 is hingedly connected to the top of the box cover 2 and can be opened outward to check the inside of the box cover 2.

[0044] The steering reducer 32 is connected to the front end of the traction shaft 33 and is connected to the transmission motor 31, so as to reduce the outward interference of the transmission motor 31.

[0045] Please refer to the drawings in the description Figures 1-4 The third embodiment of the soaking liquid spraying mechanism 4 based on the wet paper towel processing is provided, in which the constant temperature mechanism 5 is vertically arranged in the box cover 2, the constant temperature mechanism 5 comprises the vortex tube 52 connected to the side of the air blower 51, the top of the vortex tube 52 is communicated with the warm air outlet 53 arranged in the box cover 2, and the heating wire is arranged in the warm air outlet 53, so as to maintain the reaction temperature in the box cover 2 during the whole process of the wet paper towel spraying processing, and the stable processing environment of the wet paper towel is maintained during the spraying process.

[0046] Preferably, in order to reduce the temperature difference of the wet paper towel when it leaves the box cover 2, the temperature insulation curtain 22 is vertically arranged at the outlet of the rear traction shaft 33 of the box cover 2, so as to effectively reduce the temperature difference between the inside and outside of the box cover 2, so that the wet paper towel gradually adapts to the external environment after the spraying processing, and the product quality is not affected by the sudden change of temperature.

[0047] Further, in order to facilitate the maintenance and maintenance of the equipment, the maintenance door 21 is hingedly connected to the top of the box cover 2 and can be opened outward, so that the operator can check the running condition of the inside of the box cover 2 and quickly maintain or adjust when necessary, and the running convenience of the equipment is improved. In addition, the steering reducer 32 is connected to the front end of the traction shaft 33 and is connected to the transmission motor 31, so that the power transmission of the transmission motor 31 is more stable, the outward interference of the transmission motor 31 is reduced, and the smooth running of the whole traction mechanism 3 is ensured.

[0048] Through the optimization design of the above structure, the embodiment can provide a stable temperature environment during the wet paper towel spraying processing, reduce the influence of the temperature difference, and optimize the maintenance convenience and power transmission stability of the equipment.

[0049] The working principle and use process of the utility model are as follows:

[0050] In use of the soaking liquid spraying mechanism 4 based on the wet tissue processing, firstly ensure the equipment installation stable, the box cover 2 is erected on the production line through the supporting leg 1, and the normal operation of each mechanism inside is checked. The transmission motor 31 is started, the transmission motor 31 transmits power through the steering reducer 32 at the end of the front end traction shaft 33, so that the traction mechanism 3 starts to run. The driving wheel 331 of the traction mechanism 3 drives the driven chain 34 to move, the fixed rotating belt 341 between the driven chains 34 rotates, and the wet tissue substrate is transported to the spraying area.

[0051] When the wet tissue enters the spraying mechanism 4, the spraying mechanism 4 starts to work. The soaking liquid stored in the soaking cabin 41 is transported to the spraying pipe system through the S-shaped drainage cavity 45. The upper spraying pipe 43 and the lower spraying pipe 42 are respectively located above and below the rotating belt 341 and are along the traction shaft 33, so that the wet tissue receives the opposite spraying soaking liquid in the conveying process. At the same time, the side spraying pipe 44 extending inwardly of the drainage cavity 45 also starts to release the atomized soaking liquid, and the spraying holes uniformly spray, so that the wet tissue obtains the spraying treatment of full coverage in the conveying process.

[0052] In the spraying process, the constant temperature mechanism 5 in the box cover 2 synchronously runs. The vortex tube 52 connected laterally to the fan 51 is started, the warm air outlet 53 connected to the top of the vortex tube 52 starts to work, and the heating wire in the warm air outlet 53 maintains the temperature in the box cover 2, so that the spraying process is carried out in a stable environment. After the wet tissue is sprayed, it continues to be conveyed along the rotating belt 341 to the outlet of the box cover 2. In order to reduce the temperature change of the wet tissue when it leaves the box cover 2, the temperature buffer curtain 22 vertically arranged at the outlet of the rear end traction shaft 33 of the box cover 2 buffers the temperature of the wet tissue, so that it gradually adapts to the external environment.

[0053] After the whole use process is completed, the transmission motor 31 is turned off, the traction mechanism 3 stops running, and the state of each part is checked to ensure that the equipment is in good working condition for the next use.

[0054] In the equipment shutdown maintenance, the operator can immediately check through the maintenance door 21 hinged at the top of the box cover 2. The maintenance door 21 can be opened outward, so that the internal running condition of the equipment can be observed, and adjustment or maintenance can be carried out when necessary. At the same time, in order to ensure the stable running of the traction mechanism 3, the embedded plates 36 at both ends of the rear end traction shaft 33 are clamped in the hollow beam 35 and can be longitudinally slid and locked. The operator can adjust the position of the embedded plate 36 according to the running condition, so as to adjust the tightness of the driven chain 34 and ensure the stable running of the conveying system.

[0055] The above only describes the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A soaking liquid spraying mechanism (4) based on wet tissue processing, comprising a box cover (2) erected by a supporting leg (1), a traction mechanism (3) and a spraying mechanism (4) are arranged in the box cover (2), which are used for spraying processing of wet tissues; characterized in that: The traction mechanism (3) comprises a hollow beam (35) symmetrically clamped in the box cover (2), a plurality of rotatable traction shafts (33) are longitudinally inserted into the front and rear ends of the hollow beam (35), the traction shafts (33) are symmetrically sleeved with driving wheels (331) transversely, the driving wheels (331) are sleeved with driven chains (34), the driven chains (34) are transversely fixed with rotary belts (341), and the front end traction shaft (33) is connected with a transmission motor (31), so that the wet wipes on the rotary belt (341) can be driven to pass through the box cover (2) along with the driven chain (34); The spraying mechanism (4) comprises a soaking cabin (41) arranged between the supporting legs (1), the soaking cabin (41) is used for storing soaking liquid for wet wipes, the soaking cabin (41) is laterally and upwardly provided with an S-shaped drainage cavity (45), and the rotary belt (341) is provided with upper and lower spraying pipes (43) and (42) which are the same width as the traction shaft (33) and extend above and below the rotary belt (341), so that the wet wipes on the rotary belt (341) can be sprayed with soaking liquid in opposite directions.

2. The wet-wipe processing-based infusion liquid spraying mechanism (4) according to claim 1, characterized by: The drainage cavity (45) is inwardly provided with a side spraying pipe (44) which is coplanar with the hollow beam (35), and the side spraying pipe (44) is provided with a spraying hole for directional release of atomized soaking liquid.

3. The wet-wipe processing-based infusion liquid spraying mechanism (4) according to claim 2, characterized by: The rear end traction shaft (33) is sleeved with a panel (36) at both ends, the panel (36) is clamped in the hollow beam (35) and can be longitudinally slidably locked, and is used for adjusting the tightness of the driven chain (34).

4. The wet-wipe processing-based infusion liquid spraying mechanism (4) according to claim 3, characterized by: The box cover (2) is vertically provided with a constant temperature mechanism (5), the constant temperature mechanism (5) comprises a vortex tube (52) connected with a fan (51), the vortex tube (52) is provided with a warm air outlet (53) penetrating through the box cover (2) at the top, and a heating wire is attached to the warm air outlet (53), so that the reaction temperature in the box cover (2) can be maintained during the whole spraying process of the wet wipes.

5. The wet-wipe processing-based infusion liquid spraying mechanism (4) according to claim 4, characterized in that: The box cover (2) is vertically provided with a temperature insulation curtain (22) at the outlet of the rear end traction shaft (33), so as to reduce the temperature difference of the wet wipes leaving the box cover (2).

6. The wet-wipe processing-based infusion liquid spraying mechanism (4) according to claim 5, characterized by: The top of the box cover (2) is hingedly provided with an access door (21) which is opened in opposite directions, so as to be instantly viewed when being opened outwardly.

7. The wet-wipe processing-based infusion liquid spraying mechanism (4) according to claim 6, characterized by: The front end traction shaft (33) is connected with a steering reducer (32), and is steeringly connected with the transmission motor (31) through the steering reducer (32), so as to reduce the outward interference of the transmission motor (31).

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