A syringe pump

Abstract

The application relates to the field of injectors, and discloses an injection pump, which comprises a rack, an injector arranged on the rack, a piston column slidingly arranged in the injector, a supporting frame arranged in the rack, a driving piece arranged on the supporting frame, a driving end of the driving piece being provided with a synchronous wheel, a driven wheel rotatingly arranged in the supporting frame, the synchronous wheel and the driven wheel being meshed with a synchronous belt, a push block being fixedly arranged on the synchronous belt, one end of the push block penetrating through the rack and being fixedly connected with the piston column, and a limiting guide assembly arranged in the supporting frame and used for limiting the sliding direction of the push block. The application has the advantages that the synchronous belt is used as the transmission component of the injection pump, the noise of the injection pump during use is smaller, the production and maintenance costs of the synchronous belt are lower, and the synchronous belt is convenient to maintain.

Description

Technical Field

[0001] This application relates to the field of injection equipment, and more particularly to an injection pump. Background Technology

[0002] Injection pumps are a type of pump widely used in industries such as fine chemicals, pharmaceuticals, related laboratories, and emerging flow chemistry.

[0003] Currently, an infusion pump includes a frame, syringe, motor, lead screw, and slider. The syringe and motor are mounted on the frame. The lead screw is rotatably mounted inside the frame and connected to the drive end of the motor. The slider is threaded onto the lead screw and connected to the piston of the syringe. The motor drives the slider to move via the lead screw, and the slider drives the piston of the syringe to move reciprocally, thereby realizing the aspiration and dispensing of liquid by the syringe.

[0004] Injection pumps use lead screws for transmission, which have disadvantages such as high noise, high production and maintenance costs, and inconvenient maintenance. Summary of the Invention

[0005] In order to improve the problems of high noise, inconvenient maintenance, and high production and use costs of syringe pumps using lead screw drives, this application provides a syringe pump.

[0006] The injection pump provided in this application adopts the following technical solution:

[0007] An injection pump includes a frame, a syringe mounted on the frame, a piston rod slidably mounted inside the syringe, a support frame mounted inside the frame, a drive member mounted on the support frame, a synchronous pulley mounted on the drive end of the drive member, a driven pulley rotatably mounted inside the support frame, a synchronous belt meshing with the synchronous pulley and the driven pulley, a pusher fixedly mounted on the synchronous belt, one end of the pusher passing through the frame and fixedly connected to the piston rod, and a limiting guide assembly for limiting the sliding direction of the pusher within the support frame.

[0008] By adopting the above technical solution, the drive component inside the frame drives the synchronous pulley to rotate. The synchronous pulley and the driven pulley drive the synchronous belt to rotate. The synchronous belt drives the piston rod inside the syringe to slide back and forth through the push block, thereby realizing the injection and discharge of liquid in the syringe. At the same time, when the push block moves, the limiting guide component limits the push block's movement, making the push block's movement more stable, thus making the injection and discharge of liquid in the syringe more accurate. With this configuration, the syringe pump uses a synchronous belt for transmission, resulting in lower noise during operation. Furthermore, the production and maintenance costs of the synchronous belt are lower, and it is easier to maintain.

[0009] Preferably, the limiting guide assembly includes a guide rail and a guide block. The guide rail is fixedly mounted on the inner side wall of the support frame, and the guide block is slidably mounted on the guide rail in accordance with the moving direction of the push block. The guide block is fixedly connected to the push block, and the guide block and the push block clamp the synchronous belt.

[0010] By adopting the above technical solution, when the push block moves, it drives the guide block to slide on the guide rail. The guide block cooperates with the guide rail to limit the movement of the push block. At the same time, the push block and the guide block clamp the synchronous belt, making the connection between the push block and the synchronous belt more stable.

[0011] Preferably, a rack is formed on the side wall of the pusher block near the synchronous belt, and the synchronous belt meshes with the rack.

[0012] By adopting the above technical solution, when the push block and guide block clamp the synchronous belt, the teeth on the inner wall of the synchronous belt mesh with the rack, thereby making the connection between the synchronous belt and the push block more stable and the synchronous belt less prone to slippage.

[0013] Preferably, the driving component is provided with a light-blocking code disk connected to the driving end, and a first photoelectric switch is provided inside the frame, with the light-blocking code disk rotatably disposed inside the first photoelectric switch.

[0014] By adopting the above technical solution, the driving component drives the synchronous wheel to rotate while also driving the light-blocking code disk to rotate together. The first photoelectric switch detects the rotation angle of the output end of the driving component through the light-blocking code disk, thereby accurately controlling the movement stroke of the push block, and thus accurately controlling the amount of liquid drawn and discharged from the injection medium.

[0015] Preferably, a second photoelectric switch is provided on the support frame, and a sensing plate is provided on the push block. When the sensing plate enters the second photoelectric switch, the driving component is turned off.

[0016] By adopting the above technical solution, when the syringe pump is drawing liquid, the pusher block moves the piston rod downward, and simultaneously, the pusher block moves the sensing plate downward out of the second photoelectric switch. When the syringe pump is discharging liquid, the pusher block moves the piston rod upward, and simultaneously, the pusher block moves the sensing plate upward. After the sensing plate slides into the second photoelectric switch, the drive unit closes, and the pusher block stops moving. This design provides protection for the second photoelectric switch and the sensing plate, preventing the pusher block from colliding with the synchronous pulley due to excessive movement.

[0017] Preferably, the frame is provided with a valve head, and the syringe is detachably disposed below the valve head. The valve head has an inlet channel, an outlet channel, and a fluid channel. The inlet channel is connected to the fluid channel, the outlet channel is connected to the fluid channel, and the fluid channel is connected to the syringe. The frame is provided with a control component for sealing and unsealing the inlet channel and the outlet channel. When the inlet channel is sealed, the outlet channel is unsealed; when the inlet channel is unsealed, the outlet channel is sealed.

[0018] By adopting the above technical solution, when the syringe draws liquid, the control component blocks the drain channel, and the injection medium enters the valve head from the inlet channel, then flows into the fluid channel from the inlet channel, and finally is drawn into the syringe from the fluid channel; when the syringe discharges liquid, the control component blocks the inlet channel, and the injection medium flows into the drain channel from the fluid channel, and then is discharged from the valve head from the drain channel, thereby realizing the switching between the liquid drawing and draining paths in the valve head.

[0019] Preferably, the control component includes a solenoid valve, an inlet sealing plate, and an outlet sealing plate. The inlet sealing plate and the outlet sealing plate are respectively disposed at the two drive ends of the solenoid valve, and the inlet sealing plate blocks the inlet channel, while the outlet sealing plate blocks the outlet channel.

[0020] By adopting the above technical solution, the solenoid valve controls the ejection of the inlet sealing plate to seal the inlet channel, and the solenoid valve controls the ejection of the outlet sealing plate to seal the outlet channel. Compared with the traditional method of using a rotary valve to switch between the pumping and draining channels, this method of using a solenoid valve to drive the ejection of the inlet and outlet sealing plates eliminates the need for rotation, thereby reducing leakage caused by long-term rotational friction.

[0021] Preferably, a fixing block is fixedly provided on the side of the synchronous belt away from the push block, an elastic support rod is provided on the side wall of the fixing block away from the push block, a slider is provided at the end of the elastic support rod away from the fixing block, a slide block is adjustablely provided in the support frame along the direction close to or away from the push block, the slide block is inclined near the side wall of the fixing block, and the thickness of the top end of the slide block is equal to the thickness of the bottom end, and the slider is slidably provided in the slide block in the opposite direction of the push block's movement.

[0022] By adopting the above technical solution, when the timing belt becomes loose after prolonged use, adjusting the slide block allows the slider inside the slide block to tension the timing belt through the elastic support rod and the fixed block, making the transmission of the injection medium more precise. As the push block descends, liquid is continuously drawn from the syringe, increasing the pulling force required for liquid drawing. Therefore, the timing belt needs to use greater pulling force to pull the push block, further loosening the timing belt. When the timing belt drives the push block to descend, it drives the fixed block to rise in the opposite direction. The fixed block, through the elastic support rod, causes the slider to slide within the slide block. The slider continuously slides upward within the inclined slide block, thus continuously compressing the timing belt through the elastic support rod and the fixed block, keeping the timing belt taut.

[0023] Preferably, the elastic support rod includes an outer sleeve, an inner sleeve, and an elastic element. The outer sleeve is fixedly mounted on the fixed block, the inner sleeve is fixedly mounted on the slider, the outer sleeve is adapted to slide on the inner sleeve, and the elastic element is disposed in the outer sleeve and the inner sleeve.

[0024] By adopting the above technical solution, the fixed block drives the slider to move upward through the outer and inner sleeves. When the slider moves on the inclined slide block, it causes the inner sleeve to slide inside the outer sleeve. At the same time, the slider compresses the elastic element through the inner sleeve, and the elastic element acts on the fixed block through the outer sleeve, thereby tensioning the timing belt. In this configuration, the use of the elastic element for buffering prevents the timing belt from being affected by excessive tension.

[0025] Preferably, a support block is slidably disposed within the support frame along the direction close to or away from the push block, the bottom end of the slide is rotatably disposed on the support block, a first adjusting rod is threadedly disposed within the frame and the support frame, the end of the first adjusting rod abutting the bottom end of the slide sidewall, and a second adjusting rod is threadedly disposed within the frame and the support frame, the end of the second adjusting rod abutting the top end of the slide sidewall.

[0026] By adopting the above technical solution, rotating the first adjusting rod and the second adjusting rod simultaneously causes the slide to slide within the support frame, thereby adjusting the tension of the timing belt; rotating the first adjusting rod or the second adjusting rod individually causes the slide to rotate slightly on the support block, thereby adjusting the tilt angle of the inclined sidewall on the slide.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By using a synchronous belt as the transmission component of the syringe pump, the syringe pump operates with less noise, and the production and maintenance costs of the synchronous belt are low, making maintenance easier;

[0029] 2. By using a light-blocking encoder, a first photoelectric switch, a sensor plate, and a second photoelectric switch to control the movement of the pusher block, the pumping and discharging of the injection medium can be made more precise;

[0030] 3. By using a fixed block, elastic support rod, slider and slide block, when the timing belt becomes loose after long-term use, the slide block is adjusted, and the slider inside the slide block tensions the timing belt through the elastic support rod and the fixed block, making the transmission of the injection medium more accurate. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the injection pump in Embodiment 1 of this application;

[0032] Figure 2 This is an exploded view of the overall structure of the injection pump in Embodiment 1 of this application;

[0033] Figure 3 This is a partial structural cross-sectional view of the injection pump in Embodiment 1 of this application;

[0034] Figure 4 This is an exploded view of a portion of the structure of the injection pump in Embodiment 1 of this application, highlighting the limiting and guiding assembly.

[0035] Figure 5 This is a partial exploded reverse view of the structure of the injection pump in Embodiment 1 of this application;

[0036] Figure 6 This application Figure 5 Enlarged view of point A in the middle;

[0037] Figure 7 This is a partial structural cross-sectional view of the injection pump in Embodiment 2 of this application;

[0038] Figure 8 This is a partial structural cross-sectional view of the injection pump in Embodiment 2 of this application, highlighting the elastic support rod.

[0039] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Sheet metal cover; 12. Panel; 2. Injector; 3. Piston column; 4. Support frame; 5. Drive component; 6. Synchronous pulley; 7. Driven pulley; 8. Synchronous belt; 9. Push block; 10. Limit guide assembly; 101. Guide rail; 102. Guide block; 13. First photoelectric switch; 14. Second photoelectric switch; 15. Sensing plate; 16. Valve head; 17. Inlet channel; 18. Outlet channel; 19. Fluid channel; 20. Control component; 201. Solenoid valve; 202. 203. Liquid inlet sealing plate; 204. Liquid outlet sealing plate; 21. Fixing block; 22. Elastic support rod; 225. Outer sleeve; 226. Inner sleeve; 227. Elastic element; 228. Slider; 229. Slide block; 2000. Support block; 2001. First adjusting rod; 201. Second adjusting rod; 202. Rack; 203. Light blocking encoder; 204. Second circuit board; 205. Clamping groove; 206. Deformation groove; 207. Hand screw; 208. Liquid inlet; 209. Liquid outlet; 2000. Slide groove; 2000. Sliding strip hole; 2001. First circuit board. Detailed Implementation

[0040] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0041] This application discloses an injection pump.

[0042] Example 1:

[0043] Reference Figure 1 and 2 An injection pump includes a frame 1, a rectangular support frame 4 installed inside the frame 1, the frame 1 is composed of a sheet metal cover 11 and a panel 12, the support frame 4 is fixedly installed on the panel 12 by bolts, and the sheet metal cover 11 is fixedly installed on the outside of the support frame 4 by bolts.

[0044] A valve head 16 is fixedly installed on the top of the side wall of the panel 12 away from the sheet metal cover 11. A syringe 2 is fixedly installed on the bottom of the valve head 16 by a thread. A piston column 3 is slidably installed inside the syringe 2, and the bottom end of the piston column 3 extends from the bottom of the syringe 2 to the outside of the syringe 2.

[0045] Reference Figure 2 and 3 A drive component 5 is fixedly installed on the side wall of the support frame 4 away from the panel 12. The drive shaft of the drive component 5 extends to the top inside the support frame 4, and a synchronous pulley 6 is fixedly installed on the drive shaft of the drive component 5. A driven pulley 7 is rotatably installed at the bottom inside the support frame 4 via a rotating shaft. A synchronous belt 8 is meshed with the synchronous pulley 6 and the driven pulley 7. In this application, the drive component 5 can be a stepper motor. The drive component 5 drives the synchronous pulley 6 to rotate, thereby cooperating with the driven pulley 7 to drive the synchronous belt 8 to rotate.

[0046] Reference Figure 3 and 4 A limiting guide assembly 10 is installed on the inner side wall of the support block 25. The limiting guide assembly 10 includes a guide rail 101 fixedly installed on the inner side wall of the support block 25 along the length direction of the support frame 4, and a guide block 102 adapted to slide on the guide rail 101 along the length direction of the guide rail 101. A push block 9 is fixedly installed on the side wall of the guide block 102 away from the guide rail 101 by bolts.

[0047] Push block 9 and guide block 102 clamp and fix synchronous belt 8. Push block 9 has a rack 28 integrally formed on the middle of its side wall near guide block 102, and rack 28 meshes with the inner side wall of synchronous belt 8. The rotation of synchronous belt 8 can drive push block 9 to slide back and forth along the length of support frame 4, and the use of rack 28 makes it less likely for synchronous belt 8 and push block 9 to slip. The cooperation between guide block 102 and guide rail 101 makes the sliding of push block 9 more stable.

[0048] Reference Figure 1 , 2 4. A sliding strip hole 37 is provided on the panel 12 along the length of the syringe 2. The end of the push block 9 extends to the outside of the frame 1 through the sliding strip hole 37, and the end of the push block 9 slides up and down within the sliding strip hole 37. A deformation groove 32 is provided at the end of the push block 9. Semi-circular clamping grooves 31 are symmetrically provided on the opposite side walls of the deformation groove 32 within the push block 9. The bottom end of the piston rod 3 is clamped in the clamping groove 31, and a hand-tightening screw 33 is threaded onto the end of the push block 9. The hand-tightening screw allows the push block 9 to clamp, fix, and release the piston rod 3.

[0049] The motor drives the synchronous belt 8 to rotate via the synchronous pulley 6. The synchronous belt 8 drives the push block 9 to move up and down. The push block 9 drives the piston rod inside the syringe 2 to slide back and forth, thereby realizing the aspiration and dispensing of liquid by the syringe 2. The use of the synchronous belt 8 for transmission in the syringe pump makes the syringe pump quieter during operation, and the synchronous belt 8 has low production and maintenance costs and is easy to maintain.

[0050] Reference Figure 3 and 4 A first circuit board 38 is fixedly mounted on the top side wall of the support frame 4 near the drive component 5. A second photoelectric switch 14 is mounted on the first circuit board 38. The second photoelectric switch 14 is located at the top of the support frame 4, and both the second photoelectric switch 14 and the drive component 5 are electrically connected to the first circuit board 38. A sensing plate 15 is clamped and fixed between the push block 9 and the guide block 102, and the top of the sensing plate 15 is located inside the second photoelectric switch 14.

[0051] When the push block 9 slides downwards, it drives the piston column 3 to move downwards, and the syringe 2 begins to draw liquid. At this time, the push block 9 drives the sensing plate 15 to move downwards, and the sensing plate 15 moves out of the second photoelectric switch 14. When the push block 9 slides upwards, it drives the piston column 3 to move upwards, and the syringe 2 begins to discharge liquid. At this time, the push block 9 drives the sensing plate 15 to move upwards. When the sensing plate 15 re-enters the second photoelectric switch 14, the second photoelectric switch 14 is triggered, and the first circuit board 38 controls the drive component 5 to stop operating, so that the push block 9 is less likely to collide with the synchronous wheel 6 due to excessive movement.

[0052] Reference Figure 3 and 5 The drive shaft of the drive component 5 extends from the side away from the synchronous pulley 6 to the outside of the drive component 5, and a light-blocking code disk 29 is fixedly installed on the drive shaft of the drive component 5 on the side away from the synchronous pulley 6. Multiple gaps are evenly distributed around the light-blocking code disk 29. A second circuit board 30 is fixedly installed on the inner wall of the sheet metal cover 11. A first photoelectric switch 13 is installed on the second circuit board 30. The light-blocking code disk 29 is located inside the first photoelectric switch 13, and both the first photoelectric switch 13 and the drive component 5 are electrically connected to the second circuit board 30.

[0053] When the driving component 5 drives the synchronous belt 8 to rotate, the synchronous belt 8 simultaneously drives the light-blocking code disk 29 to rotate within the first photoelectric switch 13. The first photoelectric switch 13 detects the rotation angle of the output shaft of the driving component 5 through the light-blocking code disk 29, thereby precisely controlling the movement stroke of the push block 9, and thus precisely controlling the amount of liquid drawn and discharged from the injection medium.

[0054] Reference Figure 5 and 6 The valve head 16 has an inlet channel 17 and an outlet channel 18. An inlet port 34 communicating with the inlet channel 17 is installed at the top of the valve head 16, and an outlet port 35 communicating with the outlet channel 18 is installed at the top of the valve head 16. The ends of the inlet channel 17 and the outlet channel 18 are connected. A fluid channel 19 is also provided inside the valve head 16. One end of the fluid channel 19 is connected to the junction of the inlet channel 17 and the outlet channel 18, and the other end is connected to the inner cavity of the syringe 2.

[0055] Reference Figure 2 , 5A control assembly 20 is fixedly installed on the side wall of panel 12 away from valve head 16. The control assembly 20 includes a solenoid valve 201, an inlet sealing plate 202, and an outlet sealing plate 203. The inlet sealing plate 202 and the outlet sealing plate 203 are respectively installed on the two output ends of the solenoid valve 201. The solenoid valve 201 controls the inlet sealing plate 202 and the outlet sealing plate 203 to pop out; when the inlet sealing plate 202 pops out, the outlet sealing plate 203 does not pop out; when the outlet sealing plate 203 pops out, the inlet sealing plate 202 does not pop out. In this application, both the inlet sealing plate 202 and the outlet sealing plate 203 can be made of rubber.

[0056] When syringe 2 draws liquid, one output end of solenoid valve 201 pushes the liquid outlet sealing plate 203 to deform and pop out the middle of the liquid outlet sealing plate 203. The liquid outlet sealing plate 203 abuts and blocks the liquid outlet channel 18. At this time, the liquid inlet channel 17 is connected to the fluid channel 19, and the injection medium is drawn into syringe 2 from the liquid inlet 34. When syringe 2 discharges liquid, the other output end of solenoid valve 201 pushes the liquid inlet sealing plate 202 to deform and pop out the middle of the liquid inlet sealing plate 202. The liquid inlet sealing plate 202 abuts and blocks the liquid inlet and liquid outlet channels 18. At this time, the liquid outlet channel 18 is connected to the fluid channel 19, and the injection medium is discharged from syringe 2 from the liquid outlet 35.

[0057] Compared with the traditional method of using a rotary valve to switch between the pumping and draining channels, the method of using a solenoid valve 201 to drive the inlet sealing plate 202 and the outlet sealing plate 203 to pop out for switching does not require rotation, thereby reducing leakage caused by long-term rotational friction.

[0058] The implementation principle of Embodiment 1 of this application is as follows: the motor drives the synchronous pulley 6 to rotate, the synchronous pulley 6, in conjunction with the driven pulley 7, drives the synchronous belt 8 to rotate, the synchronous belt 8 drives the push block 9 to move up and down, and the push block 9 drives the piston rod inside the syringe 2 to slide back and forth, thereby realizing the aspiration and discharge of liquid by the syringe 2. The use of the synchronous belt 8 for transmission in the syringe pump makes the syringe pump quieter during use, and the production and maintenance costs of the synchronous belt 8 are low, making it easy to maintain.

[0059] Example 2:

[0060] Reference Figure 7 and 8A groove 36 is provided on the side wall of the support frame 4 away from the push block 9 in the width direction. A slide seat 24 is slidably installed in the groove 36 along the width direction of the support frame 4. A slider 23 is slidably installed in the side wall of the slide seat 24 near the push block 9 along the length direction of the slide seat 24. The push block 9 is installed on the side of the synchronous belt 8 located at the axis connecting the synchronous pulley 6 and the driven pulley 7. A fixing block 21 is fixedly installed on the other side of the synchronous belt 8 located at the axis connecting the synchronous pulley 6 and the driven pulley 7. An elastic support rod 22 is fixedly installed on the fixing block 21, and the other end of the elastic support rod 22 is fixedly connected to the slider 23.

[0061] The fixing block 21 consists of two plates, which are fixedly connected by bolts to clamp and fix the timing belt 8. The plate located inside the timing belt 8 engages with the inner wall of the timing belt 8. This makes it difficult for the fixing block 21 to slip with the timing belt 8.

[0062] Adjust the slide block 24 along the width of the support frame 4. The slide block 24, through the slider 23 and the elastic support rod 22, acts on the fixed block 21, causing the fixed block 21 to press against the synchronous belt 8 towards the push block 9, thereby tensioning the synchronous belt 8. When the synchronous belt 8 rotates, it drives the fixed block 21 to rotate, and the fixed block 21, through the elastic support rod 22, drives the slider 23 to slide within the slide block 24. The slider 23 and the slide block 24 cooperate to limit the movement of the fixed block 21, making the tensioning effect of the fixed block 21 more stable. At the same time, multiple ball bearings are installed on the side wall of the slider 23, thereby reducing the friction between the slider 23 and the slide block 24, facilitating the sliding of the slider 23.

[0063] The slide 24 is inclined near the side wall of the fixed block 21, and the thickness of the top end of the slide 24 is greater than that of the bottom end. When the push block 9 descends and liquid is continuously drawn from the syringe 2, the pulling force required for liquid drawing increases continuously. Therefore, the timing belt 8 needs to use a greater pulling force to pull the push block 9, which makes the timing belt 8 more relaxed. When the syringe 2 draws liquid, the timing belt 8 drives the fixed block 21 to rise in the opposite direction. At this time, the slider 23 slides upward continuously within the inclined slide 24. The slider 23 continuously compresses the timing belt 8 through the elastic support rod 22 and the fixed block 21, thereby keeping the timing belt 8 in a taut state.

[0064] Specifically, the elastic support rod 22 includes an outer sleeve 221, an inner sleeve 222, and an elastic element 223. The outer sleeve 221 is fixedly installed on the side wall of the fixed block 21 near the slider 23, and the inner sleeve 222 is fixedly installed on the side wall of the slider 23 near the fixed block 21. The outer sleeve 221 is coaxially slidably sleeved on the inner sleeve 222. The elastic element 223 is installed in the inner sleeve 222, and its two ends abut against the bottom walls of the inner sleeve 222 and the outer sleeve 221, respectively. When the fixed block 21 moves upward, the elastic element 223 provides cushioning, preventing the synchronous belt 8 from being affected by excessive tension.

[0065] A support block 25 is slidably installed within the support frame 4 along its width direction. The support block 25 is located directly below the slide block 24 and hinged to it. A first adjusting rod 26 and a second adjusting rod 27 are threaded onto the sheet metal cover 11 and the support frame 4. The first adjusting rod 26 abuts against the bottom of the slide block 24 away from the side wall of the fixed block 21, and the second adjusting rod 27 abuts against the top of the slide block 24 away from the side wall of the fixed block 21. In this application, both the first adjusting rod 26 and the second adjusting rod 27 can be bolts.

[0066] When the first adjusting rod 26 and the second adjusting rod 27 are rotated simultaneously, the first adjusting rod 26 and the second adjusting rod 27 push the slide 24 to slide in the slide groove 36, thereby adjusting the distance between the slide 24 and the fixed block 21, so that the tension of the synchronous belt 8 can be adjusted; when the first adjusting rod 26 or the second adjusting rod 27 is rotated alone, the slide 24 rotates slightly on the support block 25, thereby adjusting the tilt angle of the side wall of the slide 24.

[0067] The implementation principle of Embodiment 2 of this application is as follows: the slide block 24 is adjusted along the width direction of the support frame 4. The slide block 24 acts on the fixed block 21 through the slider 23 and the elastic support rod 22, so that the fixed block 21 squeezes the synchronous belt 8 in the direction closer to the push block 9, thereby tensioning the synchronous belt 8 and making the transmission of the injection medium more accurate.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An injection pump, comprising a frame (1), wherein a syringe (2) is disposed on the frame (1), and a piston (3) is slidably disposed within the syringe (2), characterized in that: A support frame (4) is provided inside the frame (1). A drive component (5) is provided on the support frame (4). A synchronous wheel (6) is provided at the drive end of the drive component (5). A driven wheel (7) is rotatably provided inside the support frame (4). A synchronous belt (8) is meshed on the synchronous wheel (6) and the driven wheel (7). A push block (9) is fixedly provided on the synchronous belt (8). One end of the push block (9) passes through the frame (1) and is fixedly connected to the piston column (3). A limiting guide component (10) for limiting the sliding direction of the push block (9) is provided inside the support frame (4). The limiting guide assembly (10) includes a guide rail (101) and a guide block (102). The guide rail (101) is fixedly mounted on the inner side wall of the support frame (4). The guide block (102) is slidably mounted on the guide rail (101) in accordance with the moving direction of the push block (9). The guide block (102) is fixedly connected to the push block (9), and the guide block (102) and the push block (9) clamp the synchronous belt (8). A rack (28) is formed on the side wall of the push block (9) near the synchronous belt (8), and the synchronous belt (8) meshes with the rack (28). A fixing block (21) is fixedly installed on the side of the synchronous belt (8) away from the push block (9). An elastic support rod (22) is installed on the side wall of the fixing block (21) away from the push block (9). A slider (23) is installed at the end of the elastic support rod (22) away from the fixing block (21). A slide block (24) is adjustablely installed in the support frame (4) along the direction close to or away from the push block (9). The slide block (24) is inclined close to the side wall of the fixing block (21). The thickness of the top end of the slide block (24) is greater than the thickness of the bottom end. The slider (23) is slidably installed in the slide block (24) in the opposite direction to the movement of the push block (9). The elastic support rod (22) includes an outer sleeve (221), an inner sleeve (222), and an elastic element (223). The outer sleeve (221) is fixedly mounted on the fixed block (21), and the inner sleeve (222) is fixedly mounted on the slider (23). The outer sleeve (221) is adapted to slide on the inner sleeve (222), and the elastic element (223) is disposed in the outer sleeve (221) and the inner sleeve (222). A support block (25) is slidably disposed inside the support frame (4) along the direction close to or away from the push block (9). The bottom end of the slide (24) is rotatably disposed on the support block (25). A first adjusting rod (26) is threaded inside the frame (1) and the support frame (4). The end of the first adjusting rod (26) abuts against the bottom end of the side wall of the slide (24). A second adjusting rod (27) is threaded inside the frame (1) and the support frame (4). The end of the second adjusting rod (27) abuts against the top end of the side wall of the slide (24).

2. The syringe pump according to claim 1, characterized in that: The drive unit (5) is provided with a light-blocking code disk (29) connected to the drive end, and the frame (1) is provided with a first photoelectric switch (13), and the light-blocking code disk (29) is rotatably disposed in the first photoelectric switch (13).

3. The syringe pump according to claim 1, characterized in that: The support frame (4) is provided with a second photoelectric switch (14), and the push block (9) is provided with a sensing plate (15). When the sensing plate (15) enters the second photoelectric switch (14), the driving member (5) is turned off.

4. The syringe pump according to claim 1, characterized in that: A valve head (16) is provided on the frame (1), and the syringe (2) is detachably disposed below the valve head (16). The valve head (16) has an inlet channel (17), an outlet channel (18), and a fluid channel (19). The inlet channel (17) is connected to the fluid channel (19), the outlet channel (18) is connected to the fluid channel (19), and the fluid channel (19) is connected to the syringe (2). A control component (20) for sealing and unsealing the inlet channel (17) and the outlet channel (18) is provided in the frame (1). When the inlet channel (17) is sealed, the outlet channel (18) is unsealed. When the inlet channel (17) is unsealed, the outlet channel (18) is sealed.

5. The syringe pump according to claim 4, characterized in that: The control component (20) includes a solenoid valve (201), an inlet sealing plate (202), and an outlet sealing plate (203). The inlet sealing plate (202) and the outlet sealing plate (203) are respectively disposed at the two drive ends of the solenoid valve (201). The inlet sealing plate (202) blocks the inlet channel (17), and the outlet sealing plate (203) blocks the outlet channel (18).

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