Electric wheelchair cutting and spraying structure and cutting and spraying machine

Abstract

The invention relates to the technical field of wheelchair part machining, in particular to an electric wheelchair cutting and spraying structure and a cutting and spraying coater, comprising: a cutting unit having a cutting state and a non-cutting state, the cutting unit comprising an air pressure unit having a positive pressure state and a negative pressure state, when the cutting unit is in a cutting state, the air pressure unit is switched to a negative pressure state, and when the cutting unit is in a non-cutting state, the air pressure unit is switched to a positive pressure state; the at least two clamping units have a clamping state and a releasing state, cavities are formed in the clamping units, when the air pressure unit is in the negative pressure state, the cavities generate adsorption force, the distance between the two clamping units can be adjusted, basic clamping is conducted on a workpiece through the clamping units, and meanwhile the adsorption units are synchronously started to adsorb and fix the workpiece; the clamping faces are made to be matched with various forms of workpieces such as circular pipes and arc-shaped handrails, and the clamping faces are made to be self-adaptive to the various forms of workpieces such as the circular pipes and the arc-shaped handrails.

Description

Technical Field

[0001] This invention relates to the field of wheelchair component processing technology, specifically to an electric wheelchair cutting and spraying structure and a cutting and spraying machine. Background Technology

[0002] In the current electric wheelchair manufacturing process, cutting and spraying are the core processes. Typically, metal workpieces such as the frame, armrests, and foot pedals are first cut to a fixed length using cutting equipment, and then the cut workpieces are transferred to spraying equipment to complete surface spraying and curing.

[0003] During cutting, to ensure that the workpiece does not shift under the cutting force, it is necessary to use a fixed structure to position and clamp the workpiece. In the existing technology, various metal workpieces for electric wheelchairs are mainly fixed by rigid clamping with fixtures. However, electric wheelchairs have diverse component shapes, including round tubes, curved armrests, flat foot pedals, and other different structures. The clamping surface of rigid fixtures is difficult to adapt to all workpiece shapes. In order to maintain stable clamping to resist cutting forces, it is necessary to increase the clamping pressure. However, excessive clamping force can easily cause damage such as squeezing deformation and tube wall dents to hollow workpieces such as round tubes. At the same time, it is still impossible to completely prevent the workpiece from moving or shifting, which will result in skewed cuts, out-of-tolerance dimensional accuracy, and affect the fit of component assembly. Summary of the Invention

[0004] The purpose of this invention is to provide an electric wheelchair cutting and spraying structure and a cutting and spraying machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An electric wheelchair cutting and spraying structure and a cutting and spraying machine are provided, including: a cutting unit having a cutting state and a non-cutting state; the cutting unit includes a pneumatic unit having a positive pressure state and a negative pressure state; when the cutting unit is in the cutting state, the pneumatic unit switches to a negative pressure state; when the cutting unit is in the non-cutting state, the pneumatic unit switches to a positive pressure state. At least two clamping units have a clamping state and a releasing state. Each clamping unit has a cavity inside. When the pneumatic unit is under negative pressure, the cavity generates an adsorption force. The distance between the two clamping units is adjustable. The transmission unit includes a lead screw, which drives the clamping unit to move axially by rotating the lead screw. A limiting unit is disposed at the end of the lead screw and provides frictional force to the end of the lead screw. When the clamping unit is in the released state, the limiting unit can drive the lead screw to rotate. When the clamping unit is in the clamping state, it prevents the lead screw from rotating.

[0006] Preferably, the cutting unit further includes a cutting component, a transmission mechanism, and a mounting part. The mounting part has a groove, the cutting component has a cutting end and a handle, and the end of the handle is movably connected to the inner wall of the groove via a connecting shaft. The handle has a channel, and the transmission mechanism is disposed in the channel. By moving the cutting end of the cutting component toward a first direction, the handle rotates in the first direction, causing the transmission mechanism to compress the air pressure unit, thus switching the air pressure unit to a negative pressure state. The air pressure unit has a hollow chamber, and the volume of the hollow chamber increases when the air pressure unit is switched to a negative pressure state.

[0007] Preferably, the pneumatic unit is connected to a second pipeline, one end of which is connected to the hollow chamber of the pneumatic unit, and the other end of which is connected to the cavity inside the clamping unit.

[0008] Preferably, a first airbag is provided in the cavity of the clamping unit, the first airbag is connected to a third pipeline, and a hole is opened on one side of the clamping unit, with the third pipeline disposed in the hole.

[0009] Preferably, a rack is provided on one side of the transmission mechanism, and a gear is fixedly connected to the outside of the connecting shaft. The rack meshes with the gear. By moving the handle in the first direction, the connecting shaft drives the gear to rotate, and then the gear meshes with the rack to drive the transmission mechanism to move in the first direction, and the pneumatic unit switches to a negative pressure state.

[0010] Preferably, the pneumatic unit is further connected to a first pipeline, the first pipeline having a first chamber, the first chamber communicating with the hollow chamber of the pneumatic unit, a fixing ring fixed to the inner wall of the first chamber, the fixing ring being connected to a sealing element by a spring, a second chamber being formed in the inner wall of the first chamber, the diameter of the sealing element being smaller than the inner diameter of the second chamber, the sealing element disengaging from the second chamber when the pneumatic unit is under positive pressure, and the sealing element entering the inner cavity of the second chamber when the pneumatic unit is under negative pressure.

[0011] Preferably, the end of the lead screw is provided with a second friction element, and the limiting unit includes a first friction element, an adjusting mechanism, a pre-tightening mechanism, and a drive shaft. The first friction element is fixedly installed at the end of the drive shaft and contacts the second friction element to generate friction. The first friction element is connected to the adjusting mechanism through the pre-tightening mechanism, and the adjusting mechanism can move along the outside of the drive shaft.

[0012] Preferably, the spraying mechanism includes a spraying frame, a nozzle, and a feeding assembly. The spraying frame is disposed on one side of the mounting unit, and the feeding assembly is connected to the nozzle to provide spraying material. The nozzle is used to perform surface spraying operations on the workpiece processed by the cutting unit.

[0013] A cutting and spraying machine includes: a cutting and spraying structure; and a transmission unit, which is disposed on a mounting unit and is used to transmit the workpiece processed by the cutting unit to the spraying frame of the spraying mechanism.

[0014] An electric wheelchair includes: a frame, armrests, foot pedals, a round tube, and a walking mechanism, wherein at least one of the frame, armrests, foot pedals, round tube, and walking mechanism is manufactured by cutting and spraying structural processing.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the workpiece is basically clamped by the clamping unit, and the adsorption unit is simultaneously activated to adsorb and fix the workpiece, so that the clamping surface can adapt to various shapes of workpieces such as round tubes and arc-shaped handrails. 2. In addition, after the cutting unit completes the cutting operation, the pneumatic unit automatically terminates the adsorption action, so as to achieve stable and damage-free clamping processing, and avoid the continuous action of adsorption force causing workpiece unloading jamming or position adjustment limitation when the same workpiece is cut a second time. This achieves the effect of rapid workpiece unloading and flexible adjustment of posture for secondary processing. 3. Based on the above structure, after the clamping unit has secured the workpiece, the limiting unit automatically limits the further superposition of the clamping force, further preventing excessive output of the clamping force. This not only avoids damage to the hollow workpiece due to overload of the clamping force, but also allows for convenient adjustment of the workpiece cutting position by releasing the clamping force, achieving the effect of protecting the integrity of the workpiece structure and flexibly adjusting the cutting position. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the cutting and spraying structure in this invention; Figure 2 This is a cross-sectional view of the overall structure of the cutting unit in this invention; Figure 3 This is a schematic diagram of the overall structure of the clamping unit 200 in this invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the clamping unit 200 in this invention; Figure 5 This is a partial structural schematic diagram of the cutting component 110 in this invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the first pipeline 140 in this invention; Figure 7 This is a schematic diagram of the overall structure of the limiting unit 400 in this invention; Figure 8 This is a cross-sectional schematic diagram of the adjusting mechanism 420 in this invention; Figure 9This is a schematic diagram of the first end structure of the lead screw 310 in this invention; Figure 10 For the present invention Figure 1 Enlarged view of area A in the middle.

[0017] In the diagram: 100, Cutting unit; 110, Cutting component; 111, Connecting shaft; 112, Channel; 120, Transmission mechanism; 121, Rack; 130, Pneumatic unit; 140, First pipeline; 141, First chamber; 142, Second chamber; 143, Sealing component; 144, Fixing ring; 150, Second pipeline; 160, Mounting part; 200, Clamping unit; 210, First airbag; 220, Third pipeline; 300, Transmission unit; 310, Lead screw; 311, Second friction component; 320, Nut; 330, Linking shaft; 400, Limiting unit; 410, First friction component; 420, Adjustment mechanism; 421, Sleeve; 422, Protrusion; 430, Pre-tightening mechanism; 440, Drive shaft; 500, Mounting unit; 510, Transmission unit; 600, Spraying mechanism. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0020] like Figures 1-2 The embodiment shown discloses a cutting and spraying structure, including a cutting unit 100, a clamping unit 200, a transmission unit 300, a limiting unit 400, and an installation unit 500. The cutting unit 100 is fixedly installed on the installation unit 500, the clamping unit 200 is installed on the transmission unit 300, the transmission unit 300 is disposed inside the installation unit 500, and the limiting unit 400 is disposed at the end of the clamping unit 200.

[0021] like Figure 3 As shown, the transmission unit 300 includes a lead screw 310 and a nut 320. The lead screw 310 is driven to rotate by a motor, causing the nut 320 to move axially along the lead screw 310. The clamping unit 200 is fixedly mounted on the nut 320. The axial movement of the nut 320 drives the clamping unit 200 to move along the top surface of the mounting unit 500. Figure 3As shown, there are two lead screws 310, which are arranged opposite each other. By rotating the two lead screws 310 in opposite directions, the two clamping units 200 can be brought closer together, and the workpiece can be placed between the two clamping units 200. The workpiece can be clamped and fixed by the clamping units 200, and the clamping units 200 can be switched to the clamping state.

[0022] Furthermore, the applicant discovered that the workpieces for electric wheelchairs include different structures such as round tubes, curved armrests, and flat foot pedals. When the existing cutting structure fixes the workpieces, in order to maintain stable clamping to resist cutting forces, it is necessary to increase the clamping pressure. However, excessive clamping force can easily cause damage such as squeezing deformation and tube wall dents to hollow workpieces such as round tubes. At the same time, it is still impossible to completely prevent the workpieces from moving or shifting.

[0023] When this device cuts a workpiece, such as Figure 2 As shown, the cutting unit 100 includes a cutting component 110, a transmission mechanism 120, a pneumatic unit 130, and a mounting part 160. The mounting part 160 has a groove. The cutting component 110 has a cutting end and a handle. The end of the handle is movably connected to the inner wall of the groove via a connecting shaft 111. The pneumatic unit 130 is disposed above the transmission mechanism 120 and has a hollow chamber. The cutting end is moved toward a first direction by a motor drive or manually. The first direction is... Figure 2 In the direction indicated by the middle arrow, the workpiece fixed by the clamping unit 200 is cut. At this time, the cutting unit 100 switches to the cutting state and moves in the first direction through the cutting end, causing the handle to drive the transmission mechanism 120 to move in the first direction, so that the transmission mechanism 120 stops squeezing the pneumatic unit 130. The pneumatic unit 130 is made of deformable materials such as polyurethane and silicone rubber and has resilience. Under its own elasticity, it gradually returns to its original shape, the volume of the hollow cavity increases, and the gas in the cavity has been discharged under positive pressure, thus forming negative pressure. The pneumatic unit 130 switches to negative pressure state, and under the action of negative pressure, the clamping unit 200 adsorbs and fixes the workpiece it is fixed to.

[0024] In order for the grip to drive the transmission mechanism 120 to move in the first direction, such as Figure 5 As shown, specifically, the handle of the cutting component 110 has a channel 112, and a gear is provided on the outside of the channel 112. The transmission mechanism 120 can move through the channel 112. When the cutting end of the cutting component 110 moves in the first direction, the handle rotates in the first direction, causing the connecting shaft 111 to drive the gear to rotate. A rack 121 is provided on one side of the transmission mechanism 120. The rack 121 meshes with the gear, so that when the handle moves in the first direction, the transmission mechanism 120 moves in the first direction.

[0025] In order for the clamping unit 200 to adsorb and fix the workpiece, such as Figure 2 , Figure 4As shown, the pneumatic unit 130 is connected to the second pipe 150. The clamping unit 200 has a cavity inside, in which a first airbag 210 is installed. The first airbag 210 is made of the same material as the pneumatic unit 130 and is elastic. The second pipe 150 is connected to the first airbag 210, and the first airbag 210 is connected to a third pipe 220. An air intake hole is opened on one side of the clamping unit 200, and the third pipe 220 is installed in the air intake hole. When the pneumatic unit 130 is in a negative pressure state, the gas in the first airbag 210 is drawn in through the second pipe 150, causing the first airbag 210 to contract. At the same time, the two clamping units 200 are attached to both sides of the workpiece, and the rubber pad at the end of the third pipe 220 is attached to the surface of the workpiece to form a sealed space. The contraction of the first airbag 210 drives the third pipe 220 to draw in the gas in the sealed space, so that the workpiece is adsorbed and fixed on one side of the clamping unit 200.

[0026] During use, it was also found that when the workpiece is clamped and adsorbed by the clamping unit 200, after the workpiece is cut, due to the adsorption effect, it is not easy for the workpiece to be removed from the clamping unit 200 when the clamping unit 200 is moved by rotating the lead screw 310, which makes unloading inconvenient. At the same time, when adjusting the cutting position of the same workpiece, it is inconvenient to move the workpiece from the adsorbed position.

[0027] Therefore, in order to solve the above problems, the improved solution includes, for example... Figure 2 , Figure 5 As shown, when the cutting end of the cutting piece 110 moves toward the second direction (the second direction is the opposite of the first direction), the handle of the cutting piece 110 rotates toward the second direction, causing the cutting unit 100 to switch to a non-cutting state, which causes the connecting shaft 111 to rotate. The transmission mechanism 120 moves toward the second direction under the cooperation of the rack 121 and the gear. When the transmission mechanism 120 moves toward the second direction, it compresses the air pressure unit 130, causing it to deform. When the volume of the hollow chamber of the air pressure unit 130 decreases, the air pressure unit 130 is switched to a positive pressure state. Under the action of positive pressure, the gas in the hollow chamber is transported to the first airbag 210 through the second pipe 150, and then transmitted to the connection point of the workpiece through the third pipe 220. The gas is injected into the sealed air, eliminating the adsorption effect on the workpiece. At this time, the workpiece can be moved and the secondary cutting position of the workpiece can be adjusted. At this time, by rotating the drive screw 310, the clamping unit 200 can be removed from the workpiece surface, which facilitates the unloading of the workpiece.

[0028] In more specific plans, such as Figure 6As shown, a first pipeline 140 is also connected to one side of the pneumatic unit 130. The first pipeline 140 has a first chamber 141, which communicates with the hollow chamber of the pneumatic unit 130. A fixing ring 144 is fixed to the inner wall of the first chamber 141, and a sealing element 143 is connected to the fixing ring 144 by a spring. A second chamber 142 is opened on the inner wall of the first chamber 141. The diameter of the sealing element 143 is smaller than the inner diameter of the second chamber 142. When the pneumatic unit 130 is in a positive pressure state, the pressure pushes the sealing element 143 to move and disengage it from the inner cavity of the second chamber 142. The sealing element 143 transitions into the inner cavity of the first chamber 141, preventing gas from being discharged through the first pipeline 140. When the pneumatic unit 130 switches to a positive pressure state, gas is prevented from being discharged through the second pipeline 150 because the path of the second pipeline 150 is longer than that of the first pipeline 140. The first pipe 140 discharges, resulting in insufficient gas delivery to the workpiece, and the adsorption effect is not released. When the pneumatic unit 130 is under negative pressure, the negative pressure causes the seal 143 to move into the inner cavity of the second chamber 142. Since the diameter of the seal 143 is smaller than the inner diameter of the second chamber 142, gas can enter the hollow cavity of the pneumatic unit 130 through the gap between the second chamber 142 and the seal 143. In this way, gas is replenished to the pneumatic unit 130 when it is under negative pressure. When the pneumatic unit 130 switches to positive pressure, there is enough gas to release the adsorption effect of the clamping unit 200 on the workpiece. Moreover, the gas can only enter the pneumatic unit 130 through the gap between the second chamber 142 and the seal 143, ensuring that the pneumatic unit 130 generates a stable negative pressure during cutting and avoiding insufficient adsorption force.

[0029] During use, it was also found that because electric wheelchairs have diverse component shapes, including round tubes, curved armrests, flat foot pedals, and other different structures, the clamping unit 200 needs to frequently adjust its stroke to adapt to the size of different workpieces when clamping them. Otherwise, the clamping force will be too large, causing the workpiece to be squeezed excessively and deformed, especially hollow workpieces such as round tubes, which are prone to deformation and damage.

[0030] Therefore, in order to solve the above problems, the improved solution includes, for example... Figure 3 As shown, the transmission unit 300 has a lead screw 310. By driving the lead screw 310 to rotate along its own axis, the clamping unit 200 can be driven to move axially. When the two clamping units 200 are fixed on both sides of the workpiece, the clamping units 200 are in a clamping state. When the clamping units 200 leave the sides of the workpiece, they are in a released state.

[0031] like Figure 7As shown, a second friction element 311 is provided at the end of the lead screw 310. The limiting unit 400 includes a first friction element 410 and a drive shaft 440. The first friction element 410 is fixedly installed at the end of the drive shaft 440 and comes into contact with the second friction element 311 to generate friction. The drive shaft 440 is driven to rotate by a motor, causing the first friction element 410 to rotate. The friction between the first friction element 410 and the second friction element 311 drives the lead screw 310 to rotate. The rotation of the lead screw 310 causes the nut 320 to move the clamping unit 200. When the clamping unit 200 clamps the workpiece, the workpiece generates resistance to the clamping unit 200, resulting in insufficient friction between the first friction element 410 and the second friction element 311 to drive the lead screw 310 to rotate. At this time, the drive shaft 440 continues to rotate but cannot drive the lead screw 310 to rotate, so that the position of the clamping unit 200 does not change, avoiding the clamping unit 200 from continuing to squeeze the workpiece and causing the workpiece to deform.

[0032] Among the better options, continue as follows Figure 7 As shown, the first friction element 410 is connected to the adjustment mechanism 420 through the pre-tightening mechanism 430, and the adjustment mechanism 420 can move along the outside of the drive shaft 440. By moving the adjustment mechanism 420, the pre-tightening force of the pre-tightening mechanism 430 is adjusted, so that the elastic force generated by the pre-tightening mechanism 430 on the first friction element 410 changes, thereby changing the friction force between the second friction element 311 and the first friction element 410. When the lead screw 310 drives the clamping unit 200 to move, the clamping force on the workpiece changes, and the clamping force can be adjusted according to the needs of processing the workpiece.

[0033] In order to move the adjustment mechanism 420, such as Figure 8 , Figure 10 As shown, a positioning hole is provided on the outer side of the drive shaft 440, and a sleeve 421 is provided on the inner side of the adjusting mechanism 420. A spring is provided in the inner cavity of the sleeve 421, and a protrusion 422 is provided at the end of the inner cavity. A movable groove is provided on the surface of the mounting unit 500. By moving the adjusting mechanism 420 along the movable groove, it can be moved along the outer side of the drive shaft 440. At the same time, the protrusion 422 is inserted into the positioning hole under the push of the spring, so as to prevent the position of the adjusting mechanism 420 from changing when the drive shaft 440 rotates.

[0034] like Figure 9As shown, the lead screw 310 has a first end and a second end. The end of the two lead screws 310 that is close to each other is the second end, and the other end is the first end. The first end of one lead screw 310 is connected to two meshing gears, which is the first gear set. The first end of the other lead screw 310 is connected to two gears that mesh through a chain, which is the second gear set. The two sets of gears are connected by a connecting shaft 330. The two gears of the first gear set mesh with each other and rotate in opposite directions. The two gears of the second gear set mesh through a chain and rotate in the same direction. This allows the two lead screws 310 to rotate in opposite directions by a drive mechanism, such as a motor driving one gear to rotate. This causes the two nuts 320 to move towards each other or away from each other, so that the clamping unit 200 can clamp or release the workpiece.

[0035] like Figure 1 As shown, a spraying mechanism 600 is provided on one side of the cutting unit 100. The spraying mechanism 600 includes a spraying frame, a nozzle and a feeding assembly. The spraying frame is located on one side of the mounting unit 500. The feeding assembly is connected to the nozzle to provide spraying material. The nozzle is used to perform surface spraying operations on the workpiece processed by the cutting unit 100.

[0036] like Figure 1 The present embodiment discloses a cutting and spraying structure, including a transmission unit 510. The transmission unit 510 is disposed on the mounting unit 500 and is used to transmit the workpiece processed by the cutting unit 100 to the spraying frame of the spraying mechanism 600. The transmission unit 510 is composed of several transmission rollers, which cause the tubular workpiece to rotate during transmission, thereby spraying the outer side of the tubular workpiece in all directions.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. The present invention is not limited to the above embodiments; the embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A cutting and spraying structure, characterized in that, include: A cutting unit (100) has a cutting state and a non-cutting state. The cutting unit (100) includes a pneumatic unit (130), which has a positive pressure state and a negative pressure state. When the cutting unit (100) is in the cutting state, the pneumatic unit (130) switches to the negative pressure state. When the cutting unit (100) is in the non-cutting state, the pneumatic unit (130) switches to the positive pressure state. At least two clamping units (200) have a clamping state and a releasing state. Each clamping unit (200) has a cavity inside. When the pneumatic unit (130) is in a negative pressure state, the cavity generates an adsorption force. The distance between the two clamping units (200) can be adjusted. The transmission unit (300) includes a lead screw (310) that drives the clamping unit (200) to move axially by rotating the lead screw (310); The limiting unit (400) is disposed at the end of the lead screw (310) and provides friction to the end of the lead screw (310). When the clamping unit (200) is in the released state, the limiting unit (400) can drive the lead screw (310) to rotate. When the clamping unit (200) is in the clamping state, it prevents the lead screw (310) from rotating.

2. The cutting and spraying structure according to claim 1, characterized in that: The cutting unit (100) further includes a cutting element (110), a transmission mechanism (120), and a mounting part (160). The mounting part (160) has a groove. The cutting element (110) has a cutting end and a handle. The end of the handle is movably connected to the inner wall of the groove through a connecting shaft (111). The handle has a channel (112). The transmission mechanism (120) is located in the channel (112). By moving the cutting end of the cutting element (110) toward the first direction, the handle rotates in the first direction, causing the transmission mechanism (120) to squeeze the air pressure unit (130), thus switching the air pressure unit (130) to a negative pressure state. The air pressure unit (130) has a hollow chamber. When the air pressure unit (130) is switched to a negative pressure state, the volume of the hollow chamber increases.

3. The cutting and spraying structure according to claim 2, characterized in that: The pneumatic unit (130) is connected to a second pipeline (150), one end of which is connected to the hollow chamber of the pneumatic unit (130), and the other end of which is connected to the cavity inside the clamping unit (200).

4. The cutting and spraying structure according to claim 3, characterized in that: The clamping unit (200) has a first airbag (210) in its cavity, and the first airbag (210) is connected to a third pipe (220). A hole is provided on one side of the clamping unit (200), and the third pipe (220) is disposed in the hole.

5. The cutting and spraying structure according to claim 4, characterized in that: A rack (121) is provided on one side of the transmission mechanism (120), and a gear is fixedly connected to the outside of the connecting shaft (111). The rack (121) meshes with the gear. By moving the handle toward the first direction, the connecting shaft (111) drives the gear to rotate, and then the transmission mechanism (120) is driven to move toward the first direction by the meshing of the gear and the rack (121), and the pneumatic unit (130) is switched to a negative pressure state.

6. The cutting and spraying structure according to claim 2, characterized in that: The pneumatic unit (130) is also connected to a first pipeline (140), which has a first chamber (141). The first chamber (141) is connected to the hollow chamber of the pneumatic unit (130). A fixing ring (144) is fixed to the inner wall of the first chamber (141). The fixing ring (144) is connected to a sealing element (143) by a spring. A second chamber (142) is opened on the inner wall of the first chamber (141). The diameter of the sealing element (143) is smaller than the inner diameter of the second chamber (142). When the pneumatic unit (130) is in a positive pressure state, the sealing element (143) is disengaged from the second chamber (142). When the pneumatic unit (130) is in a negative pressure state, the sealing element (143) enters the inner cavity of the second chamber (142).

7. The cutting and spraying structure according to claim 1, characterized in that: The end of the lead screw (310) is provided with a second friction element (311). The limiting unit (400) includes a first friction element (410), an adjustment mechanism (420), a pre-tightening mechanism (430), and a drive shaft (440). The first friction element (410) is fixedly installed on the end of the drive shaft (440) and comes into contact with the second friction element (311) to generate friction. The first friction element (410) is connected to the adjustment mechanism (420) through the pre-tightening mechanism (430), and the adjustment mechanism (420) can move along the outside of the drive shaft (440).

8. The cutting and spraying structure according to claim 1, characterized in that: A spraying mechanism (600) is provided on one side of the cutting unit (100). The spraying mechanism (600) includes a spraying frame, a nozzle and a feeding assembly. The spraying frame is located on one side of the mounting unit (500). The feeding assembly is connected to the nozzle to provide spraying material. The nozzle is used to perform surface spraying on the workpiece processed by the cutting unit (100).

9. A cutting and spraying machine, characterized in that, include: The cutting and spraying structure as described in claim 8; as well as A transmission unit (510) is disposed on the mounting unit (500) and is used to transmit the workpiece processed by the cutting unit (100) to the spraying frame of the spraying mechanism (600).

10. An electric wheelchair, characterized in that: The vehicle includes a frame, handrails, foot pedals, round tubes, and a traveling mechanism. At least one of the components, including the frame, handrails, foot pedals, round tubes, and traveling mechanism, is manufactured using the cutting and spraying structure described in any one of claims 1-8.

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