An injection pump with integrated force feedback

Abstract

The utility model discloses an integrated force feedback's injection pump, including injection mechanism, power module, detection component, control component, the utility model discloses a detection component that can detect the resistance that piston is suffered when moving to the direction of the entrance and exit is set to cooperation controller, can realize the power module that the resistance dynamic adjustment that this detection component detects obtains provides to piston, on the basis of ensuring that the position of piston in piston cavity can be initialized setting smoothly, can effectively avoid the bad influence that the impact force of piston is too big causes to injection cylinder.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection pump technical field, specifically, an injection pump of integrated force feedback. BACKGROUND

[0002] The content of this part only provides the background information related to the utility model, which can not constitute the prior art.

[0003] For the known injection pump using the cooperation of the syringe and the piston as the injection mechanism, the position of the piston in the syringe needs to be initialized before each suction and discharge of the injection pump, so as to ensure the accuracy of the subsequent suction and discharge as good as possible. Among them, the process of initializing the position of the piston in the syringe includes the operation of providing power to the piston by the power module of the injection pump, so that the piston moves towards the direction of the outlet of the syringe, and abuts against the outlet.

[0004] The power module of the common injection pump generally includes a linear driver of a motor, and such power module only needs to input current to the motor to provide power to the piston. In order to reduce the cost as much as possible, the syringe is generally made of glass.

[0005] In the known technology of initializing the position of the piston in the syringe, the current input to the motor of the power module is generally set according to experience, so as to provide the piston with the power set according to experience, so that the piston can move towards the direction of the outlet of the syringe. As for this kind of way, on the one hand, it is easy to cause the piston to hit the outlet with too much impact force, which can cause adverse effects on the syringe, such as breakage of the syringe; on the other hand, after the injection pump is in service for a long time, if the power module continues to provide the piston with the power set according to experience when the resistance between the moving piston and the syringe increases, the piston can not move smoothly to the outlet, and thus the initialization of the position of the piston can not be completed smoothly. Utility model content

[0006] Therefore, the utility model aims to provide an injection pump with integrated force feedback, so as to dynamically adjust the power provided by the power module by detecting the resistance of the piston when moving towards the direction of the outlet, so as to ensure that the initialization of the position of the piston can be completed smoothly every time, and to avoid the impact of the piston on the syringe with too much impact force as much as possible.

[0007] The utility model discloses an injection pump with integrated force feedback, comprising:

[0008] The utility model discloses an injection pump with integrated force feedback, comprising:

[0009] An injection mechanism comprises an injection cylinder and a piston; the injection cylinder defines a piston cavity, the piston is arranged in the piston cavity and can move reciprocally along the axial direction of the injection cylinder; the injection cylinder has a first end and a second end opposite to each other in the axial direction, and the first end of the injection cylinder is provided with an exit and entrance communicating with the piston cavity;

[0010] A power module is configured to provide power to the piston to force the piston to move in the piston cavity;

[0011] A detection component is configured to move synchronously with the piston; and the detection component is configured to detect the resistance suffered by the piston when the piston moves towards the direction of the exit and entrance;

[0012] A control component is configured to receive the resistance detected by the detection component and dynamically adjust the power provided by the power module based on the resistance.

[0013] Further, the power module comprises a moving part configured to move reciprocally along the axial direction of the injection cylinder;

[0014] The injection mechanism further comprises a piston rod, one end of the piston rod is connected to the piston, and the end of the piston rod away from the piston is connected to the moving part after penetrating through the second end of the injection cylinder;

[0015] The detection component is arranged on the moving part and in contact with the end surface of the end of the piston rod away from the piston.

[0016] Further, the moving part is provided with a receiving cavity adapted to accommodate the detection component and having an open structure, and the receiving cavity is provided with a removable positioning part for positioning the detection component in the receiving cavity.

[0017] Further, the positioning part is provided with a threading channel communicating with the receiving cavity.

[0018] Further, the opening of the receiving cavity is arranged on the side of the end surface of the detection component away from the piston rod.

[0019] Further, the detection component is a force sensor.

[0020] Further, the exit and entrance is provided with a sealing part arranged in the piston cavity.

[0021] The technical scheme of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0022] The utility model discloses an integrated force feedback's injection pump, through setting up the detection component that can detect the resistance that piston is towards the direction of the entrance and exit movement, and cooperation controller, can realize the power module that based on this detection component detects the power that resistance dynamic adjustment provides to piston, on the basis of ensuring that the position of piston in the piston cavity is initialized setting is successfully completed, can effectively avoid the bad influence that the impact of piston is too big causes to injection cylinder. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The structure schematic diagram of integrated force feedback's injection pump provided for the embodiment of the utility model is provided;

[0024] Figure 2 For Figure 1 The side view of integrated force feedback's injection pump shown in the partial section state in the figure is provided;

[0025] Figure 3 For Figure 2 The partial structure enlarged view of A in the figure is provided;

[0026] Figure 4 For Figure 3 The partial structure enlarged view of B in the figure is provided.

[0027] Figure: 10-injection mechanism, 11-injection cylinder, 111-piston cavity, 112-entrance and exit, 12-piston, 13-piston rod, 14-sealing element, 20-power module, 21-moving element, 211-housing cavity, 22-positioning element, 221-threading channel, 30-control valve, 40-detection component. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model more clear, the technical scheme of the utility model will be described clearly and completely in combination with specific implementation ways below.The same reference signs in the drawings represent the same parts.It is to be noted that the described embodiment is a part of the embodiment of the utility model, not all the embodiments.Based on the described embodiment of the utility model, all other embodiments obtained by the person skilled in the art without the premise of creative labor belong to the scope of protection of the utility model.

[0029] Compared with the embodiment shown in the drawings, the feasible implementation scheme in the protection scope of the utility model can have fewer components, have other components not shown in the drawings, different components, differently arranged components or differently connected components, etc.In addition, two or more components in the drawings can be realized in a single component, or a single component shown in the drawings can be realized as a plurality of separate components.

[0030] The embodiment of the utility model discloses an integrated force feedback's injection pump.Figure 1 The appearance of the exemplary injection pump disclosed by the embodiment of the utility model is shown, and Figure 1 In the embodiment, the injection pump can include an injection mechanism 10, a power module 20, and a control valve 30 arranged at the output end of the injection mechanism 10.

[0031] Figure 2 The utility model discloses an integrated force feedback injection pump in the partial section state side view, it shows the internal structure of injection mechanism 10. Figure 3 For Figure 2 The partial structure enlarged view of the injection mechanism 10 in the embodiment.

[0032] As Figure 2 And Figure 3 The injection mechanism 10 can include a syringe 11, a piston 12, and a piston rod 13.

[0033] The syringe 11 defines a piston cavity 111 extending in the axial direction thereof inside. The piston 12 is arranged in the piston cavity 111 and can reciprocate in the axial direction of the syringe 11. Meanwhile, the syringe 11 has a first end and a second end opposite in the axial direction thereof, and the first end of the syringe 11 is provided with an inlet and outlet 112 in communication with the piston cavity 111. The inlet and outlet 112 is used for the fluid to enter or exit the piston cavity 111 when the piston 12 moves in the piston cavity 111, thereby at least realizing the liquid suction and discharge function of the injection pump.

[0034] The control valve 30 is arranged at the inlet and outlet 122 and in communication with the inlet and outlet 112. The control valve 30 is used for guiding the fluid to enter or exit the inlet and outlet 112 and can realize the switching of the flow path. The control valve 30 can be a rotary valve with a flow path switching function.

[0035] In some embodiments, in order to improve the sealing performance at the inlet and outlet 112, as Figure 3 The inlet and outlet 112 is provided with a sealing element 14 inside the piston cavity 111. The sealing element 14 can be a sealing core coaxially arranged with the syringe 11, and the sealing core has a flow channel in communication with the inlet and outlet 112.

[0036] The piston rod 13 is parallel to the axial direction of the syringe 11. One end of the piston rod 13 is connected to the piston 12, for example, the side of the piston 12 away from the inlet and outlet 112. The other end of the piston rod 13 extends from the second end of the syringe 11 to the outside of the syringe 11 and is connected to the output end of the power module 20, specifically the moving element 21 to be described below, so as to receive the power provided by the power module 20 through the piston rod 13 to force the piston 12 to move in the piston cavity 111 and transmit the power to the piston 12.

[0037] It can be understood that the injection mechanism 10 and the power module 20 described above can be the structure of the injection pump known in the prior art, for example, the "syringe" and "injection driving component" disclosed in the patent document with the application number "CN202310244164.8" and the name "A constant flow rate micro-precision quantitative device" of the prior application of the applicant, which will not be described in detail here.

[0038] For such an injection pump, the process of initializing the position of the piston 12 in the syringe barrel 11 can be simply summarized as follows: assuming that the initial state of the piston 12 is at a non-zero position in the piston cavity 111, that is, the piston 12 is not in contact with the seal 14 at the inlet and outlet 112; on this basis, the power module 20 provides power to the piston 12 through the piston rod 13 to force the piston 12 to move in the direction of the inlet and outlet 112 until the piston 12 hits the inlet and outlet 112, generally hitting the seal 14 provided at the inlet and outlet 112; then, the power module 20 provides power to the piston 12 through the piston rod 13 to force the piston 12 to move away from the inlet and outlet 112 until the piston 12 moves away from the inlet and outlet 112 by a predetermined distance, generally twice the distance corresponding to the dead volume; finally, the power module 20 provides power to the piston 12 through the piston rod 13 to force the piston 12 to move in the direction of the inlet and outlet 112 until the piston 12 moves in the direction of the inlet and outlet 112 by the predetermined distance described above, at which time the position of the piston 12 can be used as the initialized zero position.

[0039] However, as described in the background art of the present application, the prior art generally presets the current of the motor input to the power module 20 according to experience to provide power to the piston 12 according to experience. In this regard, it is easy to cause the piston 12 to hit the inlet and outlet 112 with excessive impact force, causing adverse effects such as rupture of the syringe barrel 11, or the piston 12 is difficult to move smoothly to the inlet and outlet 112, so that the initialization of the position of the piston 12 cannot be completed smoothly.

[0040] Therefore, the injection pump is further improved in the embodiments of the present application, so as to dynamically adjust the power provided by the power module 20 to the piston 12 by detecting the resistance of the piston 12 when moving in the direction of the inlet and outlet 112, so as to ensure that the initialization of the position of the piston 12 can be completed smoothly every time, and to avoid the piston 12 from hitting the inlet and outlet 112 with excessive impact force, causing adverse effects on the syringe barrel 11.

[0041] Specifically, as shown in Figure 2 or Figure 3 The injection pump disclosed in the embodiments of the present application can further include a detection component 40 and a control component (not shown in the figure).

[0042] In the present embodiment, the detection component 40 is configured to be able to move synchronously with the piston 12, that is, when the piston 12 reciprocates in the axial direction of the syringe 11 within the piston cavity 111 under the action of the power provided by the power module 20, the detection component 40 is able to move synchronously with the piston 12.

[0043] In addition, the detection component 40 is also configured to detect the resistance suffered by the piston 12 when the piston 12 moves towards the direction of the outflow port 112. In other words, when the piston 12 moves towards the direction of the outflow port 112 within the piston cavity 111, if the piston 12 moves to the outflow port 112 to hit the seal 14 at the outflow port 112, the piston 12 will suffer resistance from the seal 14, and the resistance can be detected by the detection component 40. The detection component 40 can be, but is not limited to, a force sensor.

[0044] The control component is simultaneously communicatively connected to the power module 20 and the detection component 40. The communicatively connected to the power module 20 specifically means that the control component is communicatively connected to the motor in the power module 20, and the control component can at least control the size of the current input to the motor.

[0045] In addition, the control component is configured to receive the resistance detected by the detection component 40, and dynamically adjust the power provided by the power module 20 to the piston 12 based on the resistance. The control component can be a controller. The control component dynamically adjusts the power provided by the power module 20 to the piston 12 by dynamically adjusting the size of the current input to the motor in the power module 20.

[0046] Specifically, in actual implementation, a resistance threshold value can be preset in the control component, which is the resistance suffered by the piston 12 when the piston 12 hits the seal 14 at the outflow port 112, but does not adversely affect the syringe 11 (for example, causing the syringe 11 to break).

[0047] On this basis, when the position of the piston 12 within the piston cavity 111 is initialized, when the piston 12 moves towards the direction of the outflow port 112, the detection component 40 detects the resistance suffered by the piston 12 in real time and transmits it to the control component. The control component compares the resistance detected by the detection component 40 with the preset resistance threshold value, and dynamically adjusts the power provided by the power module 20 to the piston 12 according to the comparison result, that is, dynamically adjusts the size of the current input to the motor in the power module 20.

[0048] Specifically, if the resistance detected by the detection component 40 is less than the preset resistance threshold, it indicates that the piston 12 has not hit the seal 14 at the outlet 112 or the hitting force is too small, at this time, the control component can appropriately increase the power provided by the power module 20, for example, increase the current input to the motor in the power module 20, so that the resistance borne by the piston 12 reaches the preset resistance threshold, so that the subsequent operation of initializing the position of the piston 12 in the piston cavity 111 can be successfully completed; on the contrary, if the resistance detected by the detection component 40 is greater than the preset resistance threshold, it indicates that the hitting force of the piston 12 on the seal 14 at the outlet 112 is too large, which may have adverse effects on the syringe 11, at this time, the control component can appropriately reduce the power provided by the power module 20, for example, reduce the current input to the motor in the power module 20, or stop providing power to the piston 12, so as to effectively avoid the adverse effects of the excessive hitting force of the piston 12 on the syringe 11 on the basis of ensuring that the subsequent operation of initializing the position of the piston 12 in the piston cavity 111 can be successfully completed.

[0049] Among them, the position of the detection component 40 can be set in the following manner, but not limited to, so that the detection component 40 can move synchronously with the piston 12 and detect the resistance borne by the piston 12 when the piston 12 moves towards the outlet 112.

[0050] In combination with the contents shown in Figure 2 and Figure 3 , the power module 20 can further include a moving piece 21, which is configured to reciprocate along the axial direction of the syringe 11, so as to provide the piston 12 with the power output by the power module 20 to force the piston 12 to reciprocate in the piston cavity 111.

[0051] The power module 20 can further include a screw nut assembly (not shown in the figure), which is drivingly connected to the motor to convert the rotary motion output by the motor into reciprocating linear motion along the axial direction of the syringe 11, and the moving piece 21 is connected to the output end of the screw nut assembly to realize the reciprocating movement of the moving piece 21 along the axial direction of the syringe 11.

[0052] Specifically, the screw nut assembly can include a screw rod and a nut drivingly matched with the screw rod. The axial direction of the screw rod is parallel to the axial direction of the syringe 11, and the screw rod is drivingly connected to the motor to drive the screw rod to rotate, so that the screw rod outputs rotary motion around its own axis. Among them, the screw rod and the motor can be drivingly connected through a belt transmission mechanism to ensure good transmission accuracy as much as possible.

[0053] The nut is in driving cooperation with the screw rod, and specifically, the nut is threadedly connected to the screw rod and can slide relative to the screw rod in the axial direction of the syringe 11, so that the nut can convert the rotary motion output by the screw rod into linear motion of the nut in the axial direction of the screw rod, and the moving member 21 is connected to the nut to drive the moving member 21 to reciprocate in the axial direction of the screw rod (i.e., the axial direction of the syringe 11) through the nut.

[0054] At this time, the end of the piston rod 13 away from the piston 12 passes through the second end of the syringe 11 and is connected to the moving member 21, so that when the moving member 21 moves, the moving member 21 can transmit power to the piston 12 through the piston rod 13.

[0055] The detection component 40 can be arranged on the moving member 21, so that the detection component 40, the piston rod 13, and the piston 12 can move synchronously with the moving member 21. In addition, the detection component 40 is in contact with the end face of the end of the piston rod 13 away from the piston 12.

[0056] In this way, when the motor of the power module 20 is working and the moving member 21 drives the piston 12, the piston rod 13, and the detection component 40 to move synchronously in the direction of the outlet 112 under the driving action of the screw nut assembly, the detection component 40 can detect the resistance of the piston 12 when the piston 12 hits the seal 14 at the outlet 112.

[0057] In some embodiments, as shown in Figure 4 , the moving member 21 is provided with a receiving cavity 211 adapted to accommodate the detection component 40 and having an open structure, and the opening of the receiving cavity 211 is provided with a removable positioning member 22 for positioning the detection component 40 in the receiving cavity 211. The opening of the receiving cavity 211 can be arranged on the side of the end face of the detection component 40 away from the piston rod 13, so as to optimize the structural design of the assembly of the moving member 21, the piston rod 13, and the detection component 40.

[0058] It can be understood that by arranging the detection component 40 in the receiving cavity 211 with an opening, when the detection component 40 needs to be replaced or maintained, the positioning member 22 only needs to be removed from the opening of the receiving cavity 211, which effectively improves the convenience of replacing or maintaining the detection component 40.

[0059] In some embodiments, continuing to refer to Figure 4 , the positioning member 22 can also be provided with a threading passage 221 in communication with the receiving cavity 211. The threading passage 221 is arranged to facilitate the extraction of the cable required for the connection between the detection component 40 and the control component. The threading passage 221 can be in the form of a hole formed on the positioning member 22.

[0060] The above merely is preferred embodiment of the present utility model, and is not for limiting the present utility model, for the person skilled in the art, the present utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An integrated force feedback syringe pump, characterized by, The injection mechanism comprises an injection barrel and a piston; the injection barrel defines a piston cavity, the piston is arranged in the piston cavity and can move reciprocally along the axial direction of the injection barrel; the injection barrel has a first end and a second end opposite to each other in the axial direction, and the first end of the injection barrel is provided with an outlet communicating with the piston cavity; a power module configured to provide power to the piston to force the piston to move in the piston cavity; a detection component configured to move synchronously with the piston; and the detection component is configured to detect the resistance suffered by the piston when the piston moves towards the direction of the outlet; a control component configured to receive the resistance detected by the detection component and dynamically adjust the power provided by the power module based on the resistance. The power module comprises a moving member configured to move reciprocally along the axial direction of the injection barrel; 2. The syringe pump integrated with force feedback according to claim 1, characterized in that, The injection mechanism further comprises a piston rod, one end of the piston rod is connected to the piston, and the end of the piston rod away from the piston is connected to the moving member through the second end of the injection barrel; The detection component is arranged on the moving member and in contact with the end surface of the end of the piston rod away from the piston. The moving member is provided with a receiving cavity adapted to accommodate the detection component and having an open structure, and the opening of the receiving cavity is provided with a removable positioning member for positioning the detection component in the receiving cavity.

3. The syringe pump integrated with force feedback of claim 2, wherein, The positioning member is provided with a threading channel communicating with the receiving cavity.

4. The syringe pump integrated with force feedback of claim 3, wherein, The opening of the receiving cavity is located on the side of the end surface of the detection component away from the piston rod.

5. The force feedback integrated syringe pump of claim 3, wherein, The detection component is a force sensor.

6. The force feedback integrated syringe pump of claim 1, wherein, The outlet is provided with a sealing member located in the piston cavity.

7. The force feedback integrated syringe pump of claim 1, wherein, ​

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