Transmission device, fluid conveying equipment and automatic injection system

Abstract

The invention provides a transmission device, fluid conveying equipment and an automatic injection system, and belongs to the technical field of transmission. Comprising a first transmission shaft, a first transmission piece, a second transmission piece, a first rotating piece, a second rotating piece, a linear motion part and a distance sensor. The first transmission part and the second transmission part are both in a sector ring shape and are both installed on the first transmission shaft. The first rotating piece is in transmission fit with the linear motion part. When the first transmission part is in transmission fit with the first rotating part, the second transmission part is separated from the second rotating part, at least one distance sensor is located at the detection position, and at least one distance sensor is located at the calibration position. When the first transmission part is separated from the first rotating part, the second transmission part is in transmission fit with the second rotating part, the second rotating part rotates relative to the first rotating part, and the distance sensors at the detection position and the calibration position are exchanged. The transmission precision can be continuously monitored in real time while a transmission task is executed.

Description

Technical Field

[0001] This application relates to the field of transmission technology, and more specifically, to a transmission device, fluid conveying equipment, and automatic injection system. Background Technology

[0002] Transmission devices are widely used in various industrial fields. For transmission devices, transmission accuracy is one of the most important indicators, as it directly affects the precision of related processes and procedures.

[0003] In applications requiring exceptionally high transmission accuracy, timely testing and calibration are typically employed to monitor the transmission system's precision. However, this method is not only labor-intensive but also prone to blind spots. For instance, if a decrease in accuracy occurs between two consecutive testing and calibration cycles, it may go undetected. While the decrease might be detected during the next calibration, it has already impacted the overall operation.

[0004] In view of the above, this application is hereby submitted. Summary of the Invention

[0005] The first objective of this application is to provide a transmission device that can continuously and in real-time monitor the transmission accuracy while performing transmission tasks, without the need for manual intervention. This not only reduces the workload of staff but also facilitates real-time monitoring of the transmission accuracy, effectively ensuring the timely detection of accuracy problems.

[0006] The second objective of this application is to provide a fluid conveying device that can continuously and in real-time monitor the conveying accuracy while performing fluid conveying tasks, without the need for manual intervention. This not only reduces the workload of staff but also facilitates real-time monitoring of the conveying accuracy, effectively ensuring the timely detection of conveying problems.

[0007] The third objective of this application is to provide an automatic injection system that can continuously and in real-time monitor the injection accuracy while performing injection tasks, without the need for manual intervention. This not only reduces the workload of staff but also facilitates real-time monitoring of injection accuracy, effectively ensuring the timely detection of injection problems.

[0008] The embodiments of this application are implemented as follows: A transmission device includes: a first transmission shaft, a first transmission component, a second transmission component, a first rotating component, a second rotating component, a linear motion part, and a distance sensor.

[0009] Both the first and second transmission components are fan-shaped, and both are mounted on the first transmission shaft.

[0010] The outer ring wall of the first transmission component has a first tooth, and the outer ring wall of the second transmission component has a second tooth.

[0011] The first rotating component is in transmission engagement with the linear motion component.

[0012] There are at least two distance sensors, which are all located on the second rotating component and are spaced apart along the rotation direction of the second rotating component.

[0013] The first transmission component is used in transmission engagement with the first rotating component. The second transmission component is used in transmission engagement with the second rotating component. The rotational resistance of the first rotating component is greater than the rotational resistance of the second rotating component.

[0014] When the first transmission component engages with the first rotating component via the first tooth, the second transmission component separates from the second rotating component, and the first rotating component drives the linear motion part to move. At this time, at least one distance sensor is in the detection position and at least one distance sensor is in the calibration position.

[0015] When the first transmission component separates from the first rotating component, the second transmission component engages with the second rotating component through the second tooth, causing the second rotating component to rotate relative to the first rotating component and exchanging the distance sensors at the detection position and the calibration position.

[0016] Among them, the distance sensor at the detection position is used to detect the position of the linear motion part, and the distance sensor at the calibration position is used to perform the calibration process.

[0017] Furthermore, the first rotating component is cylindrical, and the second rotating component is disposed inside the first rotating component and rotatably fitted to it. The rotation axes of the first and second rotating components coincide.

[0018] A mating ring is fixedly connected to the inner ring wall of the first rotating component, and the mating ring is coaxially arranged with the first rotating component. A mating gear ring is provided on one side wall of the mating ring.

[0019] The second rotating component is fixedly connected to a positioning rod, which is set perpendicular to the rotation axis of the second rotating component. Each distance sensor is equipped with a corresponding positioning rod.

[0020] A rotating column is rotatably mounted on the end of the positioning rod away from the rotation axis of the second rotating component. The rotation axis of the rotating column coincides with the central axis of the positioning rod. A mounting base is connected to the end of the rotating column away from the positioning rod, and a distance sensor is mounted on the mounting base. A mating gear is connected to the side of the mounting base away from the rotating column. The mating gear is coaxial with the rotating column and meshes with a mating ring.

[0021] The distance sensor located at the detection position is positioned toward the linear motion part, and the distance sensor located at the calibration position is positioned toward the second rotating part.

[0022] Furthermore, one end of the first rotating member is closed by a sealing plate, and the second rotating member extends out of the first rotating member from the end of the first rotating member away from the sealing plate.

[0023] The sealing plate has a detection port to make way for the distance sensor located at the detection position.

[0024] Furthermore, the transmission device also includes: a slide rail and a reference component.

[0025] The slide rail is located on the side of the first rotating member away from the linear motion part and is spaced apart from the first rotating member. The reference member is slidably fitted into the slide rail.

[0026] The distance sensor located at the calibration position is oriented toward the reference.

[0027] The first rotating component engages with the reference component via a reciprocating drive mechanism. During the process from when the first drive component is engaged with the first rotating component until it just separates from it, the first rotating component drives the reference component to complete N complete reciprocating motions. Here, N is a positive integer.

[0028] Furthermore, the sidewall of the first rotating member has an inner cavity that extends continuously in a ring shape along the circumference of the first rotating member.

[0029] The inner ring wall of the first rotating component has a mating hole that communicates with the inner cavity. A locking tongue is slidably fitted in the mating hole, and the locking tongue and the mating hole slide to seal each other.

[0030] The outer ring wall of the first rotating component has a first communication port that communicates with the inner cavity.

[0031] The outer ring wall of the first rotating component is also fitted with a first reference ring, the inner ring wall of the first reference ring is in contact with the outer ring wall of the first rotating component, and the first rotating component is rotatably fitted with the first reference ring.

[0032] The inner ring wall of the first reference ring has a first groove, which extends continuously in a ring shape along the circumference of the first reference ring. The first connecting port communicates with the first groove. The first rotating component and the first reference ring are rotatably sealed.

[0033] The transmission device also includes: a third transmission component and a second reference ring.

[0034] The third transmission component is also fan-shaped and fits into the first transmission shaft.

[0035] Among them, the central angle corresponding to the second transmission component is less than the central angle corresponding to the first rotating component, the central angle corresponding to the first rotating component is less than the central angle corresponding to the third transmission component, and the sum of the central angles corresponding to the second transmission component and the third transmission component is less than 360°.

[0036] The third transmission component has a first cavity formed on one side wall of the notch, and a second cavity formed on the other side wall of the notch. Both the first and second cavities extend circumferentially along the first transmission shaft. A first arc-shaped component is slidably fitted inside the first cavity, and a second arc-shaped component is slidably fitted inside the second cavity. The first arc-shaped component and the first cavity are slidably sealed, and a first elastic component abuts against the inner end wall of the second cavity.

[0037] The second transmission component is located within the notch of the third transmission component, and both the first and second arc-shaped components are connected to the second transmission component. In its natural state, under the elastic force of the first elastic component, the second transmission component abuts against the side of the notch closest to the first cavity.

[0038] The second reference ring is coaxially arranged with the first transmission shaft, and the second reference ring is attached to one side of the third transmission component, which is rotatably fitted to the second reference ring.

[0039] A second groove is formed on the side wall of the second reference ring near the third transmission member, and the second groove extends continuously in a ring shape along the circumference of the second reference ring. A second communication port is formed on the side of the third transmission member near the second reference ring, connecting the second groove and the first cavity. A rotational seal is formed between the third transmission member and the second reference ring.

[0040] A second elastic element is connected between the latch and the inner wall of the inner cavity, and the second elastic element is in an elastically stretched state.

[0041] A connecting pipe is connected between the first reference ring and the second reference ring, and the connecting pipe connects the first groove and the second groove.

[0042] The inner cavity, the first groove, the connecting pipe, the second groove, and the first cavity are all filled with liquid medium.

[0043] The second rotating component has a lock hole for engaging with the lock tongue.

[0044] During the process from when the second transmission component is engaged with the second rotating component until it just separates from the second rotating component, the second transmission component drives the second rotating component to rotate P revolutions relative to the first rotating component. Here, P is a positive integer.

[0045] The maximum elastic force of the first elastic element is less than the rotational resistance of the first rotating element, and the maximum elastic force of the first elastic element is also less than the rotational resistance of the second rotating element.

[0046] When the second transmission component comes into contact with the side of the notch closest to the first cavity, the locking tongue engages with the lock hole.

[0047] Once the second transmission component engages with the second rotating component, the second rotating component pushes the second transmission component to the other side of the notch. When the second transmission component comes into contact with the other side of the notch, the bolt retracts from the lock hole.

[0048] As soon as the second transmission component separates from the second rotating component, the first elastic component drives the second transmission component to rotate relative to the third transmission component and reset, and the locking tongue re-locks into the lock hole.

[0049] Furthermore, the second rotating component is fixedly connected to a second drive shaft.

[0050] The transmission device also includes a lead screw and a nut.

[0051] One end face of the lead screw has a mating cavity extending along its axial direction, and the mating cavity is coaxial with the lead screw.

[0052] The second drive shaft is fitted into the mating cavity. Along the axial direction of the second drive shaft, the second drive shaft is in sliding engagement with the lead screw. Along the circumferential direction of the second drive shaft, the second drive shaft is in fixed engagement with the lead screw.

[0053] The nut is fitted onto the lead screw and engages with the lead screw thread.

[0054] The linear motion section is connected to the end of the lead screw away from the second drive shaft.

[0055] Furthermore, the nut is coaxially provided with an outer ring body, the inner diameter of which is larger than the outer diameter of the nut. The outer ring body and the nut are fixedly connected by a connecting rib. The gap between the outer ring body and the nut is used to allow space for the distance sensor to detect the position of the linear motion part.

[0056] A fluid transport device includes: a driver, a cylinder, a piston, and the aforementioned transmission device.

[0057] The piston fits into the cylinder.

[0058] The linear motion part of the transmission device is fixedly connected to the piston, and the outer ring of the transmission device is fixedly connected to the cylinder.

[0059] The driver engages with the first drive shaft.

[0060] An automatic injection system includes: a controller and the aforementioned fluid delivery device.

[0061] The cylinder of the fluid delivery equipment is an injection cylinder.

[0062] The drive of the fluid transport equipment is electrically connected to the controller and is controlled by the controller.

[0063] The beneficial effects of the technical solutions in this application include: Overall, the transmission device provided in this application embodiment can achieve continuous and real-time monitoring of transmission accuracy while performing transmission tasks, without the need for manual intervention. This not only reduces the workload of staff, but also facilitates real-time monitoring of transmission accuracy, effectively ensuring the timeliness of detecting accuracy problems.

[0064] The fluid conveying equipment provided in this application embodiment can achieve continuous and real-time monitoring of conveying accuracy while performing fluid conveying tasks, without the need for manual intervention. This not only reduces the workload of staff, but also facilitates real-time monitoring of conveying accuracy, effectively ensuring the timeliness of detecting conveying problems.

[0065] The automatic injection system provided in this application embodiment can continuously and in real time monitor the injection accuracy while performing injection tasks, without the need for manual intervention. This not only reduces the workload of staff, but also facilitates real-time monitoring of injection accuracy, effectively ensuring the timeliness of detecting injection problems. Attached Figure Description

[0066] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 This is a schematic diagram of the overall structure of the transmission device provided in the embodiments of this application; Figure 2 for Figure 1 A schematic diagram of the structure of the transmission device; Figure 3 This is a schematic diagram showing the fit between the first rotating component and the second rotating component; Figure 4 This is a schematic diagram of the distance sensor configuration; Figure 5 This is a schematic diagram showing the first transmission component just separating from the first external gear ring of the first rotating component; Figure 6 This is a schematic diagram showing the second transmission component meshing with the second external gear ring of the second rotating component. Figure 7 This is a schematic diagram showing the second transmission component in contact with the side of the second cavity of the notch. Figure 8 This is a schematic diagram showing the second transmission component just separating from the second rotating component. Figure 9 This is a schematic diagram showing the second rotating component rotating and resetting relative to the third transmission component. Figure 10 This is a schematic diagram showing the first transmission component not yet re-engaging with the first external gear ring of the first rotating component; Figure 11 This is a schematic diagram showing the fit between the outer ring and the nut. Figure 12This is a schematic diagram of the overall structure of the fluid transport device provided in the embodiments of this application.

[0068] Explanation of reference numerals in the attached figures: First drive shaft 100; First drive component 110; Second drive component 120; Third drive component 130; Notch 131; First cavity 132; Second cavity 133; First arc-shaped component 134; Second arc-shaped component 135; First elastic component 136; Second connecting port 137; First rotating component 200; First external gear ring 210; Mating ring 220; Sealing plate 230; Detection port 231; Inner cavity 240; Mating hole 241; Locking tongue 242; First connecting port 243; Second elastic component 244; Second rotating component 300 Second external gear ring 310; end plate 320; clearance opening 321; base 330; positioning rod 340; rotating column 350; mounting base 360; mating gear 370; locking hole 380; linear motion part 400; distance sensor 500; slide rail 610; reference part 620; first reference ring 710; first groove 711; second reference ring 720; second groove 721; second drive shaft 800; lead screw 910; nut 920; outer ring body 930; connecting rib 940; cylinder 2100; piston 2200. Detailed Implementation

[0069] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0070] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0071] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0072] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0073] Furthermore, the terms "vertical" and "parallel" do not mean that the parts must be absolutely vertical or parallel, but can be slightly tilted.

[0074] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0075] The technical solutions of this application will be described by way of example through some embodiments below.

[0076] To overcome the shortcomings of existing technologies, see Figures 1-3 This application provides a transmission device, which includes: a bracket, a first transmission shaft 100, a first transmission component 110, a second transmission component 120, a first rotating component 200, a second rotating component 300, a linear motion part 400, and a distance sensor 500.

[0077] The first drive shaft 100 is rotatably mounted on the bracket, and the rotation axis of the first drive shaft 100 is set to coincide with its central axis.

[0078] Both the first transmission component 110 and the second transmission component 120 are fan-shaped, and both are mounted on the first transmission shaft 100. The inner ring wall of the first transmission component 110 is attached to and fixedly connected to the outer wall of the first transmission shaft 100.

[0079] The complete circles corresponding to the first transmission component 110 and the second transmission component 120 are coaxially arranged with the first transmission shaft 100.

[0080] The outer ring wall of the first transmission member 110 has a first tooth, which extends in an arc shape along the outer ring wall of the first transmission member 110. The outer ring wall of the second transmission member 120 has a second tooth, which extends in an arc shape along the outer ring wall of the second transmission member 120. In other words, both the first transmission member 110 and the second transmission member 120 can be regarded as incomplete gears (i.e., gears with a notch 131).

[0081] The first rotating member 200 is in transmission cooperation with the linear motion unit 400. When the first rotating member 200 rotates, it can drive the linear motion unit 400 to perform linear motion.

[0082] There are at least two distance sensors 500, and the distance sensors 500 are all disposed on the second rotating member 300 and distributed at intervals along the rotation direction of the second rotating member 300. In this embodiment, there are two distance sensors 500, and the two distance sensors 500 are symmetrically distributed along the rotation axis of the second rotating member 300.

[0083] The first rotating member 200 has a first external gear ring 210, and the second rotating member 300 has a second external gear ring 310.

[0084] The first transmission member 110 is used to engage with the first external gear ring 210 using its first teeth, thereby achieving a transmission engagement with the first rotating member 200. The second transmission member 120 is used to engage with the second external gear ring 310 using its second teeth, thereby achieving a transmission engagement with the second rotating member 300.

[0085] The rotation axes of the first rotating component 200 and the second rotating component 300 coincide, and the rotation axes of the first rotating component 200 and the second rotating component 300 are parallel to the rotation axis of the first transmission shaft 100.

[0086] The first rotating member 200 is rotatably mounted on the bracket, and the second rotating member 300 is rotatably fitted to the first rotating member 200. The resistance experienced by the first rotating member 200 when rotating relative to the bracket is greater than the resistance experienced by the second rotating member 300 when rotating relative to the first rotating member 200.

[0087] Since both the first transmission member 110 and the second transmission member 120 are fan-shaped, when the first transmission shaft 100 drives the first transmission member 110 and the second transmission member 120, when the first transmission shaft 100 rotates one revolution, the first transmission member 110 is only engaged with the first rotating member 200 for a portion of the time, specifically corresponding to the time when the first tooth engages with the first external gear ring 210. Similarly, the second transmission member 120 is only engaged with the second rotating member 300 for a portion of the time, specifically corresponding to the time when the second tooth engages with the second external gear ring 310.

[0088] In this embodiment, when the first transmission member 110 is engaged with the second transmission member 110 (i.e., when the first transmission member 110 can drive the second transmission member 110), the second transmission member 120 and the second rotating member 300 are separated (i.e., the second transmission member 120 cannot drive the second transmission member 120 at this time). However, when the second transmission member 120 is engaged with the second rotating member 300 (i.e., when the second transmission member 120 can drive the second rotating member 300), the first transmission member 110 and the first rotating member 200 are separated (i.e., the first transmission member 110 cannot drive the first transmission member 110 at this time).

[0089] Specifically: When the first transmission component 110 engages with the first rotating component 200 via the first tooth and the first external gear ring 210, the second transmission component 120 is separated from the second rotating component 300, and the first rotating component 200 drives the linear motion unit 400 to perform linear motion. At this time, one distance sensor 500 is in the detection position, and the other distance sensor 500 is in the calibration position.

[0090] Among them, the distance sensor 500 in the detection position is used to detect the distance of the linear motion unit 400, thereby determining the specific position of the linear motion unit 400 moving in a straight line, and the distance sensor 500 in the calibration position is used to perform the calibration process.

[0091] Since the resistance encountered by the first rotating component 200 when rotating relative to the support is greater than the resistance encountered by the second rotating component 300 when rotating relative to the first rotating component 200, the first rotating component 200 can rotate together with the second rotating component 300 when the first rotating component 200 rotates. In other words, the second rotating component 300 will rotate with the first rotating component 200.

[0092] After the first transmission member 110 separates from the first rotating member 200, the second transmission member 120 engages with the second rotating member 300 via its second teeth, applying a driving force to the second rotating member 300. Because the resistance experienced by the first rotating member 200 relative to the support is greater than the resistance experienced by the second rotating member 300 relative to the first rotating member 200, the second rotating member 300 will rotate relative to the first rotating member 200 but will not be able to drive the first rotating member 200 to rotate. At this time, the second rotating member 300 rotates relative to the first rotating member 200, and the two distance sensors 500 mounted on the second rotating member 300 move with it, causing the positions of the two distance sensors 500 to exchange; that is, the distance sensor 500 located at the detection position and the distance sensor 500 located at the calibration position exchange positions.

[0093] In this way, the distance sensor 500, originally used to detect the specific position of the linear motion unit 400, can undergo a calibration process to calibrate its detection accuracy. The distance sensor 500, having already undergone accuracy calibration, is then used to detect the specific position of the linear motion unit 400. Through this design, progressive (intermittent) driving of the linear motion unit 400 can be achieved while two sets of distance sensors 500 are used for alternating detection and calibration, ensuring that the detection accuracy of the distance sensors 500 used to detect the specific position of the linear motion unit 400 is reliable.

[0094] By combining progressive (intermittent) drive with repeated calibration of the distance sensor 500, the control accuracy of the specific position of the linear motion part 400 can be effectively improved, ensuring the transmission accuracy of the transmission device.

[0095] Overall, the transmission device provided in this application embodiment can achieve continuous and real-time monitoring of transmission accuracy while performing transmission tasks, without the need for manual intervention. This not only reduces the workload of staff, but also facilitates real-time monitoring of transmission accuracy, effectively ensuring the timeliness of detecting accuracy problems.

[0096] Specifically, in this embodiment, both the first rotating member 200 and the second rotating member 300 are cylindrical.

[0097] The first rotating component 200 and the second rotating component 300 are coaxially arranged, and the central axes of the first rotating component 200 and the second rotating component 300 are respectively aligned with their respective rotation axis centers.

[0098] The first external gear ring 210 is located on the outer ring wall of the first rotating member 200, and the second external gear ring 310 is located on the outer ring wall of the second rotating member 300.

[0099] The outer diameter of the second rotating member 300 is adapted to the inner diameter of the first rotating member 200. The second rotating member 300 is disposed inside the first rotating member 200 and rotatably fitted to the first rotating member 200. The rotation axes of the first rotating member 200 and the second rotating member 300 are coincident.

[0100] Please combine Figure 4 A mating ring 220 is fixedly connected to the inner ring wall of the first rotating member 200. The outer ring wall of the mating ring 220 is attached to and fixedly connected to the inner ring wall of the first rotating member 200. The mating ring 220 and the first rotating member 200 are coaxially arranged. Along the axial direction of the first rotating member 200, the mating ring 220 and the second rotating member 300 are spaced apart.

[0101] A mating gear ring is provided on the side wall of the mating ring 220 away from the second rotating member 300.

[0102] The end of the second rotating member 300 near the mating ring 220 is closed by the end plate 320. A base 330 is fixedly connected to the side of the end plate 320 away from the second rotating member 300. The base 330 is cylindrical and is coaxially arranged with the second rotating member 300.

[0103] A positioning rod 340 is fixedly connected to the base 330. The positioning rod 340 is arranged perpendicular to the rotation axis of the second rotating component 300 and is arranged radially along the base 330. Each distance sensor 500 is correspondingly equipped with a positioning rod 340.

[0104] The positioning rods 340 corresponding to the two distance sensors 500 are located on opposite sides of the base 330, and the two positioning rods 340 are coaxially arranged.

[0105] A rotating column 350 is rotatably mounted on one end of the positioning rod 340 away from the rotation axis of the second rotating member 300. The rotation axis of the rotating column 350 is coincident with its own central axis, and the rotation axis of the rotating column 350 is also coincident with the central axis of the positioning rod 340.

[0106] A mounting base 360 ​​is fixedly connected to the end of the rotating column 350 away from the positioning rod 340, and the distance sensor 500 is mounted on the mounting base 360. A mating gear 370 is fixedly connected to the side of the mounting base 360 ​​away from the rotating column 350. The mating gear 370 is coaxially arranged with the rotating column 350 and is located on the side of the mating ring 220 away from the second rotating member 300. The mating gear 370 meshes with the mating gear ring of the mating ring 220.

[0107] The distance sensor 500 located at the detection position is positioned towards the linear motion unit 400. The orientation (detection path) of the distance sensor 500 is along the axial direction of the first rotating member 200, and it faces away from the second rotating member 300. The distance sensor 500 located at the calibration position is positioned towards the second rotating member 300. The orientation (detection path) of the distance sensor 500 is also along the axial direction of the first rotating member 200, but it faces the side where the second rotating member 300 is located.

[0108] When the second rotating member 300 rotates relative to the first rotating member 200, the second rotating member 300 drives the base 330 to rotate, thereby causing the mating gear 370 to move circumferentially along the mating ring 220, thus making the mating gear 370 rotate. After the mating gear 370 rotates, the mounting base 360 ​​also rotates, thereby changing the orientation of the distance sensor 500 mounted on the mounting base 360. Through this design, the orientations of the two distance sensors 500 can be interchanged, thereby realizing the interchangeability of the distance sensors 500 in the detection position and calibration position.

[0109] Furthermore, one end of the first rotating member 200 is closed by a sealing plate 230, which is located on the side of the mating ring 220 away from the second rotating member 300, and the sealing plate 230 and the mating ring 220 are spaced apart.

[0110] The second rotating member 300 extends from the end of the first rotating member 200 away from the sealing plate 230 beyond the first rotating member 200. The second external gear ring 310 is located on the outer ring wall of the second rotating member 300, and the second external gear ring 310 is located outside the first rotating member 200.

[0111] The sealing plate 230 has a detection port 231 to make way for the distance sensor 500 located at the detection position. The distance sensor 500 located at the detection position detects the position of the linear motion part 400 through the detection port 231.

[0112] From the moment the second transmission component 120 engages with the second rotating component 300 until the second transmission component 120 disengages from the second rotating component 300, the second rotating component 300 rotates relative to the first rotating component 200, and the mating gear 370 rotates along the mating ring 220 throughout this process. The number of rotations of the mating gear 370 during this entire process is (K+0.5) revolutions, where K is a positive integer. This ensures that the distance sensors 500 on the two mounting bases 360 are reversed.

[0113] Furthermore, the transmission device also includes: slide rail 610 and reference component 620.

[0114] The slide rail 610 is located on the side of the first rotating member 200 away from the sealing plate 230 and is spaced apart from the second rotating member 300. The slide rail 610 is a straight track and extends along the axial direction of the first rotating member 200.

[0115] Along the length of the slide rail 610, the reference piece 620 is slidably fitted into the slide rail 610.

[0116] The distance sensor 500, located at the calibration position, is positioned facing the reference member 620. The end plate 320 has a clearance opening 321 through which it passes, allowing the distance sensor 500 at the calibration position to detect the distance to the reference member 620. Each distance sensor 500 has a corresponding clearance opening 321.

[0117] The first rotating member 200 is connected to the reference member 620 via a reciprocating drive mechanism. That is, when the first transmission member 110 drives the first rotating member 200, the first rotating member 200 can also drive the reference member 620 to perform reciprocating linear motion on the slide rail 610 via the reciprocating drive mechanism.

[0118] From the moment the first transmission component 110 engages with the first rotating component 200 until the moment it disengages from the first rotating component 200, the first rotating component 200 can drive the reference component 620 to complete N complete reciprocating motions. Here, N is a positive integer.

[0119] With this design, when the first rotating member 200 is driven, the second rotating member 300 is separated from the second transmission member 120. The second rotating member 300 is not affected by the second transmission member 120; it simply rotates along with the first rotating member 200. Therefore, in this state, the orientation of the two distance sensors 500 remains constant. That is, the distance sensor 500 located at the calibration position always faces the reference member 620.

[0120] For the reference component 620, after the first rotating component 200 rotates at different angles, the actual position of the reference component 620 on the slide rail 610 can be determined. In this way, the distance sensor 500 located at the calibration position can be calibrated by using the reference component 620 to move closer to and further away from the distance sensor 500 along the axial direction of the first rotating component 200.

[0121] The linear motion range of the reference member 620 on the slide rail 610 can be set according to the linear motion range of the linear motion unit 400, so that the reference member 620 can calibrate the detection accuracy of the distance sensor 500 within the required distance range, thereby ensuring the detection accuracy of the distance sensor 500.

[0122] In this embodiment, the sidewall of the first rotating member 200 has an inner cavity 240, which extends continuously in a ring shape along the circumference of the first rotating member 200.

[0123] The inner ring wall of the first rotating member 200 is provided with a mating hole 241 that communicates with the inner cavity 240. A locking tongue 242 is slidably fitted in the mating hole 241, and the locking tongue 242 and the mating hole 241 are slidably sealed.

[0124] The outer ring wall of the first rotating component 200 has a first communication port 243 that communicates with the inner cavity 240.

[0125] The outer ring wall of the first rotating member 200 is also fitted with a first reference ring 710. The inner ring wall of the first reference ring 710 fits against the outer ring wall of the first rotating member 200. The first reference ring 710 is fixedly installed on the bracket, and the first rotating member 200 is rotatably fitted with the first reference ring 710.

[0126] The inner ring wall of the first reference ring 710 has a first groove 711, which extends continuously in a ring shape along the circumference of the first reference ring 710. The first connecting port 243 communicates with the first groove 711. The first rotating member 200 and the first reference ring 710 are rotatably sealed. That is, during the rotation of the first rotating member 200 relative to the first reference ring 710, the first connecting port 243 is always in communication with the first groove 711.

[0127] The transmission device also includes: a third transmission component 130 and a second reference ring 720.

[0128] The third transmission component 130 is also fan-shaped and fits into the first transmission shaft 100. The inner ring wall of the third transmission component 130 is attached to and fixedly connected to the outer wall of the first transmission shaft 100. The complete circumference corresponding to the third transmission component 130 is coaxially arranged with the first transmission shaft 100.

[0129] The third transmission component 130 is positioned corresponding to the second external gear ring 310.

[0130] Wherein, the central angle corresponding to the second transmission component 120 is less than the central angle corresponding to the first rotating component 200, the central angle corresponding to the first rotating component 200 is less than the central angle corresponding to the third transmission component 130, the sum of the central angles corresponding to the second transmission component 120 and the third transmission component 130 is less than 360°, and the diameter of the circumference corresponding to the second transmission component 120 is greater than the diameter of the circumference corresponding to the third transmission component 130.

[0131] A first cavity 132 is formed on one side wall of the notch 131 of the third transmission component 130, and a second cavity 133 is formed on the other side wall of the notch 131 of the third transmission component 130. Both the first cavity 132 and the second cavity 133 extend circumferentially along the first transmission shaft 100.

[0132] The first cavity 132 has a first arc-shaped component 134 that slides within it, and the second cavity 133 has a second arc-shaped component 135 that slides within it.

[0133] The outer wall of the first arc-shaped member 134 is attached to and slidably sealed with the inner wall of the first cavity 132. The second arc-shaped member 135 and the inner end wall of the second cavity 133 are abutted by a first elastic member 136. The first elastic member 136 is used to drive the second arc-shaped member 135 to move outward from the second cavity 133.

[0134] The second transmission member 120 is disposed in the notch 131 of the third transmission member 130. The first arc-shaped member 134 and the second arc-shaped member 135 are both fixedly connected to the second transmission member 120. The first arc-shaped member 134 and the second arc-shaped member 135 are also arranged along the circumference of the circle corresponding to the second transmission member 120.

[0135] In its natural state, under the elastic force of the first elastic member 136, the second transmission member 120 abuts against the side of the notch 131 near the first cavity 132.

[0136] The second reference ring 720 is fixedly installed on the bracket. The second reference ring 720 is coaxially arranged with the first transmission shaft 100. The inner diameter of the second reference ring 720 is larger than the outer diameter of the first transmission shaft 100. The second reference ring 720 is attached to one side of the third transmission member 130. The third transmission member 130 is rotatably fitted to the second reference ring 720.

[0137] A second groove 721 is formed on the side wall of the second reference ring 720 near the third transmission member 130. The second groove 721 extends continuously in a ring shape along the circumference of the second reference ring 720. A second communication port 137 is formed on the side of the third transmission member 130 near the second reference ring 720, connecting the second groove 721 and the first cavity 132. The second communication port 137 extends to the inner end wall of the first cavity 132 and communicates with the first cavity 132. Specifically, one end of the second communication port 137 is located on the side wall of the third transmission member 130 near the second reference ring 720, and the other end of the second communication port 137 is located on the end wall of the first cavity 132 away from the notch 131. That is, the second communication port 137 is formed on the inner end wall of the first cavity 132 and further extends to the side of the third transmission member 130 near the second reference ring 720. Finally, the second communication port 137 communicates with the second groove 721 of the second reference ring 720.

[0138] Rotational seal between the third transmission component 130 and the second reference ring 720.

[0139] A second elastic element 244 is connected between the latch 242 and the inner wall of the inner cavity 240. The second elastic element 244 is in an elastic tension state and is used to apply a pulling force to the latch 242 to drive the latch 242 to move into the inner cavity 240.

[0140] A connecting pipe is provided between the first reference ring 710 and the second reference ring 720, and the connecting pipe connects the first groove 711 and the second groove 721.

[0141] The inner cavity 240, the first groove 711, the connecting pipe, the second groove 721, and the first cavity 132 are all filled with a liquid medium. The liquid medium can be water, but is not limited to this. The liquid medium in the inner cavity 240 is connected to the liquid medium in the first groove 711 through the first connecting port 243. The liquid medium in the first groove 711 is connected to the liquid medium in the second groove 721 through the connecting pipe. The liquid medium in the second groove 721 is connected to the liquid medium in the first cavity 132 through the second connecting port 137, thereby forming a continuous internal space for the flow of the liquid medium.

[0142] The outer ring wall of the second rotating member 300 has a lock hole 380 for engaging with the lock tongue 242.

[0143] During the entire process from the moment the second transmission member 120 engages with the second rotating member 300 until it separates from the first rotating member 200, the second transmission member 120 drives the second rotating member 300 to rotate P revolutions relative to the first rotating member 200. Here, P is a positive integer. That is, after the second transmission member 120 has completed driving the second rotating member 300 to rotate relative to the first rotating member 200, the distance sensor 500 located at the detection position and the distance sensor 500 located at the calibration position have interchanged. After the interchange of the distance sensors 500, the lock hole 380 remains aligned with the lock tongue 242.

[0144] In this embodiment, when the first transmission member 110 just engages with the first external gear ring 210 of the first rotating member 200, the second transmission member 120 and the second rotating member 300 are separated from each other. Due to the elastic force of the first elastic member 136, the second transmission member 120 abuts against the side of the notch 131 near the first cavity 132.

[0145] In this state, the first arc-shaped member 134 is fully located in the first cavity 132, the amount of liquid medium in the first cavity 132 is at its minimum level, the amount of liquid medium in the first groove 711 is at its maximum level, and the locking tongue 242 is partially pushed out from the mating hole 241 by the hydraulic pressure to overcome the pulling force of the second elastic member 244. The locking tongue 242 is locked into the locking hole 380, thereby locking the second rotating member 300. At this time, the second rotating member 300 cannot rotate relative to the first rotating member 200. Since the second transmission member 120 and the second rotating member 300 are always separated from each other during the process of the first transmission member 110 cooperating with the first rotating member 200 and driving the first rotating member 200, the second rotating member 300 is stable relative to the first rotating member 200 during this process. The position and orientation of the distance sensor 500 are also stable. The distance sensor 500 located at the detection position can stably detect the position of the linear motion part 400, and the distance sensor 500 located at the calibration position can stably perform calibration, ensuring the smooth progress of detection and calibration and avoiding additional errors.

[0146] During the process of the first transmission component 110 driving the first rotating component 200, the first rotating component 200 can smoothly drive the linear motion component 400.

[0147] When the first transmission component 110 just separates from the first external gear ring 210 of the first rotating component 200, such as Figure 5 As shown (the rotation direction of the first drive shaft 100 is...) Figure 5 (In the clockwise direction shown from the perspective shown), at this time, the second transmission component 120 is just engaged with the second external gear ring 310 of the second rotating component 300, as... Figure 6 As shown.

[0148] As the first drive shaft 100 continues to rotate, the second drive member 120 interacts with the second rotating member 300. Guided by the first arc-shaped member 134 and the second arc-shaped member 135, the second drive member 120 can move along the circumference of the third drive member 130.

[0149] When the second transmission member 120 abuts against the side of the notch 131 near the first cavity 132, the elastic force of the first elastic member 136 is at its minimum level. At this time, the elastic force provided by the first elastic member 136 is less than the resistance encountered by the first rotating member 200 during rotation.

[0150] In this way, as the first drive shaft 100 continues to rotate, the second drive member 120 cannot drive the second rotating member 300 and the first rotating member 200. Instead, it will be pushed by the second rotating member 300, causing the second drive member 120 to move towards the other side of the notch 131 until the second drive member 120 is in contact with the other side of the notch 131. Figure 7 As shown.

[0151] At this time, the second arc-shaped member 135 moves fully into the second cavity 133, and the elastic force of the first elastic member 136 is at its maximum level. At this time, the elastic force provided by the first elastic member 136 is still less than the resistance encountered by the rotation of the first rotating member 200, and the first rotating member 200 and the second rotating member 300 remain stationary.

[0152] As the second transmission component 120 drives the first arc-shaped component 134 to move a certain distance outward from the first cavity 132, although the first arc-shaped component 134 is still located inside the first cavity 132, the distance between the first arc-shaped component 134 and the inner end wall of the first cavity 132 increases. Some of the liquid medium in the second groove 721 is sucked into the first cavity 132, which results in a decrease in the liquid medium in the first groove 711. Under the action of pressure and the pulling force of the second elastic component 244, the locking tongue 242 completely retracts into the mating hole 241, the locking tongue 242 separates from the locking hole 380, and the locking of the second rotating component 300 is released.

[0153] As the first drive shaft 100 continues to rotate, the third drive member 130 can drive the second drive member 120 to move together. Since the second rotating member 300 has been unlocked, the second drive member 120 can drive the second rotating member 300 to rotate.

[0154] When the second transmission component 120 just separates from the second rotating component 300, such as Figure 8 As shown, the second transmission component 120 drives the second rotating component 300 to rotate P revolutions relative to the first rotating component 200. The distance sensor 500 located at the detection position and the distance sensor 500 located at the calibration position are interchanged. After the distance sensor 500 is interchanged, the lock hole 380 is still aligned with the lock tongue 242.

[0155] As the first drive shaft 100 continues to rotate, since the second drive member 120 has separated from the second rotating member 300, the first elastic member 136 can push the second arc-shaped member 135 to reset the rotation of the second rotating member 300 relative to the third drive member 130. Figure 9 As shown, the second transmission component 120 is finally re-fitted to the side of the notch 131 near the first cavity 132.

[0156] When the second transmission component 120 re-fits into the notch 131 near the first cavity 132, the locking tongue 242 re-locks into the locking hole 380, relocking the second rotating component 300. At this time, the first transmission component 110 still has not re-engaged with the first external gear ring 210 of the first rotating component 200, as... Figure 10 As shown.

[0157] As the first drive shaft 100 continues to rotate, the first transmission component 110 can re-engage with the first external gear ring 210 of the first rotating component 200, thereby performing the next cycle of transmission work.

[0158] With the above design, each time the first drive shaft 100 is driven to rotate once, the first rotating component 200 intermittently drives the linear motion part 400 to move once, and completes the interchange of the two distance sensors 500, so that the two distance sensors 500 can alternately perform distance detection and calibration.

[0159] The entire process can be achieved simply by driving the first drive shaft 100 to rotate in one direction. No additional control is required, making it simple, convenient, and highly controllable.

[0160] In this embodiment, the sealing plate 230 is fixedly connected to a second drive shaft 800, the second drive shaft 800 is coaxially arranged with the first rotating member 200, and the second drive shaft 800 is located on the side of the sealing plate 230 away from the second rotating member 300.

[0161] The transmission device also includes a lead screw 910 and a nut 920.

[0162] The lead screw 910 is located on the side of the first rotating member 200 away from the second rotating member 300, and the lead screw 910 is coaxially arranged with the second transmission shaft 800.

[0163] One end face of the lead screw 910 has a mating cavity extending along its axial direction, and the mating cavity is coaxially arranged with the lead screw 910.

[0164] The second drive shaft 800 is fitted into the mating cavity.

[0165] Along the axial direction of the second drive shaft 800, the lead screw 910 is slidably fitted onto the second drive shaft 800.

[0166] Along the circumference of the second drive shaft 800, the lead screw 910 is fixedly fitted with the second drive shaft 800.

[0167] Nut 920 is fitted onto lead screw 910 and is threaded into lead screw 910.

[0168] The linear motion unit 400 is connected to the end of the lead screw 910 away from the second drive shaft 800.

[0169] Please combine Figure 11 The nut 920 is also coaxially provided with an outer ring body 930. The inner diameter of the outer ring body 930 is larger than the outer diameter of the nut 920. The outer ring body 930 and the nut 920 are fixedly connected by connecting ribs 940. In this embodiment, the central angle corresponding to the connecting rib 940 along the circumference of the outer ring body 930 is less than or equal to 5°. There are two connecting ribs 940, which are respectively arranged on opposite sides of the nut 920, and the connecting ribs 940 are arranged radially along the nut 920.

[0170] The outer ring 930 needs to be fixed.

[0171] The gap between the outer ring 930 and the nut 920 is used to make way for the distance sensor 500 to detect the position of the linear motion part 400, and the connecting rib 940 is located in the gap between the outer ring 930 and the nut 920.

[0172] The distance sensor 500 located at the detection position has a detection path that passes through the gap between the detection port 231 and above and points to the linear motion part 400. That is, the distance sensor 500 detects the position of the linear motion part 400 through the gap between the detection port 231 and above.

[0173] The linear motion unit 400 can be connected to the target object to be driven as needed. In this way, intermittent linear driving of the target object can be achieved simply by driving the first transmission shaft 100. The specific application scenario of the transmission device provided in this application embodiment can be flexibly selected according to actual needs.

[0174] This application also provides a fluid transport device, such as... Figure 12 As shown, the fluid conveying device includes: a driver, a cylinder 2100, a piston 2200, and the aforementioned transmission device.

[0175] The piston 2200 is fitted into the cylinder 2100, and there is a sliding seal between the piston 2200 and the cylinder 2100.

[0176] The cylinder 2100 is located on the side of the lead screw 910 away from the first rotating member 200, and the cylinder 2100 and the lead screw 910 are coaxially arranged.

[0177] The linear motion part 400 of the transmission device is fixedly connected to the piston 2200. The outer ring body 930 of the transmission device is located inside the cylinder 2100. The outer ring body 930 is located at one end of the cylinder 2100 near the first rotating member 200. The outer ring wall of the outer ring body 930 is fixedly connected to the inner wall of the cylinder 2100.

[0178] The driver is in drive with the first drive shaft 100, and the driver is used to drive the first drive shaft 100 to rotate in one direction.

[0179] With this design, the piston 2200 moves relative to the cylinder 2100, which enables the cylinder 2100 to draw in fluid and discharge the fluid inside the cylinder 2100, thereby realizing the transportation of fluid.

[0180] This application also provides an automatic injection system, which includes a controller and the fluid delivery device described above.

[0181] The cylinder 2100 of the fluid delivery device is configured as an injection cylinder.

[0182] The drive of the fluid transport equipment is electrically connected to the controller and is controlled by the controller.

[0183] The controller is used to control the driver according to a preset program, so that the transmission device intermittently drives the piston 2200 at a predetermined speed to achieve intermittent injection.

[0184] This automated injection system can be applied to scenarios including, but not limited to, drug injection and reagent / raw material addition.

[0185] In summary, the transmission device provided in this application embodiment can achieve continuous and real-time monitoring of transmission accuracy while performing transmission tasks, without the need for manual intervention. This not only reduces the workload of staff but also facilitates real-time monitoring of transmission accuracy, effectively ensuring the timely detection of accuracy problems.

[0186] The fluid conveying equipment provided in this application embodiment can achieve continuous and real-time monitoring of conveying accuracy while performing fluid conveying tasks, without the need for manual intervention. This not only reduces the workload of staff, but also facilitates real-time monitoring of conveying accuracy, effectively ensuring the timeliness of detecting conveying problems.

[0187] The automatic injection system provided in this application embodiment can continuously and in real time monitor the injection accuracy while performing injection tasks, without the need for manual intervention. This not only reduces the workload of staff, but also facilitates real-time monitoring of injection accuracy, effectively ensuring the timeliness of detecting injection problems.

[0188] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A transmission device, characterized in that, include: A first drive shaft, a first transmission component, a second transmission component, a first rotating component, a second rotating component, a linear motion part, and a distance sensor; Both the first transmission component and the second transmission component are fan-shaped, and both the first transmission component and the second transmission component are mounted on the first transmission shaft; The outer ring wall of the first transmission member has a first tooth, and the outer ring wall of the second transmission member has a second tooth; The first rotating component is in transmission cooperation with the linear motion part; The distance sensor is at least two, and the distance sensors are all disposed on the second rotating member and distributed at intervals along the rotation direction of the second rotating member; The first transmission component is used for transmission cooperation with the first rotating component; the second transmission component is used for transmission cooperation with the second rotating component; the rotational resistance of the first rotating component is greater than the rotational resistance of the second rotating component; When the first transmission member engages with the first rotating member through the first tooth, the second transmission member separates from the second rotating member, and the first rotating member drives the linear motion part to move. At this time, at least one of the distance sensors is in the detection position and at least one of the distance sensors is in the calibration position. When the first transmission component separates from the first rotating component, the second transmission component engages with the second rotating component through the second teeth, and the second rotating component rotates relative to the first rotating component, thereby exchanging the distance sensors at the detection position and the calibration position. The distance sensor at the detection position is used to detect the position of the linear motion unit, and the distance sensor at the calibration position is used to perform the calibration process.

2. The transmission device according to claim 1, characterized in that, The first rotating component is cylindrical, and the second rotating component is disposed inside the first rotating component and rotatably fitted to the first rotating component; the rotation axes of the first rotating component and the second rotating component are coincident. A mating ring is fixedly connected to the inner ring wall of the first rotating component, and the mating ring is coaxially arranged with the first rotating component; a mating toothed ring is provided on one side wall of the mating ring. The second rotating component is fixedly connected to a positioning rod, which is arranged perpendicular to the rotation axis of the second rotating component. Each distance sensor is correspondingly configured with one positioning rod. A rotating column is rotatably mounted at one end of the positioning rod away from the rotation axis of the second rotating component, and the rotation axis of the rotating column coincides with the central axis of the positioning rod; a mounting base is connected to one end of the rotating column away from the positioning rod, and the distance sensor is mounted on the mounting base; a mating gear is connected to one side of the mounting base away from the rotating column, and the mating gear is coaxial with the rotating column and meshes with the mating ring; The distance sensor located at the detection position is positioned toward the linear motion part, and the distance sensor located at the calibration position is positioned toward the second rotating member.

3. The transmission device according to claim 2, characterized in that, One end of the first rotating member is closed by a sealing plate, and the second rotating member extends from the end of the first rotating member away from the sealing plate to the outside of the first rotating member; The sealing plate has a detection port to make way for the distance sensor located at the detection position.

4. The transmission device according to claim 2, characterized in that, The transmission device further includes: a slide rail and a reference component; The slide rail is located on the side of the first rotating member away from the linear motion part and is spaced apart from the first rotating member; the reference member is slidably fitted to the slide rail; The distance sensor located at the calibration position is positioned toward the reference element; The first rotating component is driven by the reference component through a reciprocating drive mechanism; during the process from when the first drive component is engaged with the first rotating component until the first drive component is disengaged from the first rotating component, the first rotating component drives the reference component to complete N complete reciprocating motions; where N is a positive integer.

5. The transmission device according to claim 4, characterized in that, The sidewall of the first rotating member has an inner cavity, which extends continuously in a ring shape along the circumference of the first rotating member; The inner ring wall of the first rotating component has a mating hole that communicates with the inner cavity. A locking tongue is slidably fitted in the mating hole, and the locking tongue and the mating hole are slidably sealed. The outer ring wall of the first rotating component has a first communication port that communicates with the inner cavity; The outer ring wall of the first rotating member is also fitted with a first reference ring, the inner ring wall of the first reference ring is in contact with the outer ring wall of the first rotating member, and the first rotating member is rotatably fitted with the first reference ring. The inner ring wall of the first reference ring is provided with a first groove, the first groove extends continuously in a ring shape along the circumference of the first reference ring, and the first communication port communicates with the first groove. A rotational seal exists between the first rotating component and the first reference ring; The transmission device further includes: a third transmission component and a second reference ring; The third transmission component is also fan-shaped and fits into the first transmission shaft; Wherein, the center angle corresponding to the second transmission component is less than the center angle corresponding to the first rotating component, the center angle corresponding to the first rotating component is less than the center angle corresponding to the third transmission component, and the sum of the center angle corresponding to the second transmission component and the center angle corresponding to the third transmission component is less than 360°; The third transmission component has a first cavity on one side wall of the notch and a second cavity on the other side wall of the notch; both the first cavity and the second cavity extend circumferentially along the first transmission shaft; a first arc-shaped component is slidably fitted inside the first cavity and a second arc-shaped component is slidably fitted inside the second cavity; wherein, the first arc-shaped component and the first cavity are slidably sealed, and a first elastic component abuts against the inner end wall of the second cavity; The second transmission member is disposed in the notch, and both the first arc-shaped member and the second arc-shaped member are connected to the second transmission member; in the natural state, under the elastic force of the first elastic member, the second transmission member abuts against the side of the notch near the first cavity; The second reference ring is coaxially arranged with the first transmission shaft, and the second reference ring is attached to one side of the third transmission member, and the third transmission member is rotatably fitted to the second reference ring; The second reference ring has a second groove on its side wall near the third transmission member, and the second groove extends continuously in a ring shape along the circumference of the second reference ring; the third transmission member has a second communication port on its side near the second reference ring, which connects the second groove and the first cavity; the third transmission member and the second reference ring are rotatably sealed. A second elastic element is connected between the latch and the inner wall of the inner cavity, and the second elastic element is in an elastically stretched state. A connecting pipe is provided between the first reference ring and the second reference ring, and the connecting pipe connects the first groove and the second groove; The inner cavity, the first groove, the connecting pipe, the second groove, and the first cavity are all filled with a liquid medium; The second rotating member has a locking hole for engaging with the locking tongue; During the process from when the second transmission component is just engaging with the second rotating component until the second transmission component is just separating from the second rotating component, the second transmission component drives the second rotating component to rotate P revolutions relative to the first rotating component; where P is a positive integer. The maximum elastic force of the first elastic element is less than the rotational resistance of the first rotating element, and the maximum elastic force of the first elastic element is also less than the rotational resistance of the second rotating element. When the second transmission member abuts against the side of the notch near the first cavity, the locking tongue locks into the lock hole; When the second transmission component engages with the second rotating component, the second transmission component pushes the second rotating component to the other side of the notch; when the second transmission component abuts against the other side of the notch, the locking tongue retracts from the lock hole. After the second transmission member separates from the second rotating member, the first elastic member drives the second transmission member to rotate relative to the third transmission member and reset, and the locking tongue re-locks into the lock hole.

6. The transmission device according to claim 5, characterized in that, The first rotating component is fixedly connected to the second drive shaft; The transmission device also includes: a lead screw and a nut; The lead screw has a mating cavity extending along its axial direction on one end face, and the mating cavity is coaxial with the lead screw. The second drive shaft is fitted into the fitting cavity; along the axial direction of the second drive shaft, the second drive shaft is slidably fitted with the lead screw; along the circumferential direction of the second drive shaft, the second drive shaft is fixedly fitted with the lead screw. The nut is sleeved on the lead screw and is threaded into the lead screw; The linear motion unit is connected to the end of the lead screw away from the second drive shaft.

7. The transmission device according to claim 6, characterized in that, The nut is also coaxially provided with an outer ring body, the inner diameter of which is larger than the outer diameter of the nut, and the outer ring body and the nut are fixedly connected by a connecting rib; the gap between the outer ring body and the nut is used to make way for the distance sensor to detect the position of the linear motion part.

8. A fluid conveying device, characterized in that, include: The actuator, the cylinder, the piston, and the transmission device as described in any one of claims 1-7; The piston is fitted into the cylinder; The linear motion part of the transmission device is fixedly connected to the piston; The driver engages with the first drive shaft.

9. An automatic injection system, characterized in that, include: The controller and the fluid delivery device as described in claim 8; The cylinder of the fluid delivery device is an injection cylinder; The drive of the fluid transport device is electrically connected to and controlled by the controller.

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