A method for disassembling and assembling a peristaltic pump hose

Abstract

This invention relates to the field of medical device technology, and more particularly to a method for assembling and disassembling a peristaltic pump tubing. The method includes: first, driving a worm gear that mates with the peristaltic pump tubing to rotate forward using a drive motor, thereby bringing the tubing closer to the peristaltic pump; then, acquiring the torque and speed of the drive motor in real time; when the torque is greater than a preset torque and the speed is less than a preset speed, driving the worm gear to reverse a preset angle using the drive motor. This method avoids installation failure due to insufficient torque by first increasing the torque, and then reverses the worm gear by a certain angle after the peristaltic pump tubing is in place, thus preventing the worm gear from compressing the tubing due to excessive torque, ensuring an effective increase in fluid flow rate, and thus ensuring that injection accuracy is not affected.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a method for disassembling and assembling a peristaltic pump hose. Background Technology

[0002] Peristaltic pumps are also known as metering pumps, constant flow pumps, hose pumps, and hose peristaltic pumps in the industry. In terms of delivery precision, they belong to the categories of metering pumps and constant flow pumps. Structurally, they are hose pumps; and operating on the same principle, they are peristaltic pumps. A peristaltic pump consists of three parts: a driver, a pump head, and a hose. The main competitive advantages of peristaltic pumps include fluid isolation within the pump tubing, quick tubing replacement, reversible flow, dry operation, and low maintenance costs.

[0003] CN113521434A discloses a high-pressure injection system and method, and further discloses that by driving a worm gear to rotate forward and backward by a motor, the spiral teeth on the worm gear are used to move the infusion tube (peristaltic pump hose) to change the direction of the infusion tube, thereby realizing the separation and clamping of the infusion tube on the roller.

[0004] Peristaltic pumps require frequent hose replacements during use. When installing the hose using a worm gear, the torque may be too low or too high. If the motor torque is too low, the hose installation will fail. If the motor torque is too high, the worm gear will compress the hose, preventing the liquid flow rate from being effectively increased during high-speed operation of the peristaltic pump, thus affecting the injection accuracy. Summary of the Invention

[0005] This invention provides a method for assembling and disassembling a peristaltic pump hose, which solves the technical problems in the prior art where the installation of a peristaltic pump hose is carried out by driving a worm gear with a motor, resulting in installation failure due to insufficient motor torque and reduced injection accuracy due to excessive torque.

[0006] The present invention provides a method for disassembling and assembling a peristaltic pump hose, comprising:

[0007] The drive motor drives the worm gear that is in contact with the peristaltic pump hose to rotate forward, so as to move the peristaltic pump hose closer to the peristaltic pump;

[0008] Obtain the torque and speed of the drive motor;

[0009] When the torque is greater than the preset torque and the speed is less than the preset speed, the worm gear is driven to reverse by the drive motor at a preset angle.

[0010] In the first possible disassembly and assembly method, obtaining the torque of the drive motor in real time includes:

[0011] Obtain the operating current of the drive motor;

[0012] The torque is calculated based on the operating current.

[0013] In conjunction with the first possible disassembly and assembly method, in the second possible disassembly and assembly method, the torque is specifically calculated based on the operating current as follows:

[0014] T = It / i, where T is the torque, I is the operating current, t is the rated torque of the drive motor, and i is the rated current of the drive motor.

[0015] In the third possible disassembly and assembly method, obtaining the rotational speed of the drive motor includes:

[0016] The speed of the drive motor is detected by a speed encoder.

[0017] In conjunction with the third possible disassembly and assembly method, in the fourth possible disassembly and assembly method, the speed encoder is an opto-orthogonal encoder or a Hall-effect quadrature encoder.

[0018] In a fifth possible disassembly method, combining a peristaltic pump hose disassembly and assembly method, a first possible disassembly and assembly method, a second possible disassembly and assembly method, a third possible disassembly and assembly method, or a fourth possible disassembly and assembly method, the preset angle A ∈ [55°, 65°].

[0019] In a sixth possible disassembly and assembly method, combining a peristaltic pump hose disassembly and assembly method, a first possible disassembly and assembly method, a second possible disassembly and assembly method, a third possible disassembly and assembly method, or a fourth possible disassembly and assembly method, the preset speed is a modulated speed of 8%-12%.

[0020] In a seventh possible disassembly method, which combines a peristaltic pump hose disassembly method, a first possible disassembly method, a second possible disassembly method, a third possible disassembly method, or a fourth possible disassembly method, after the worm gear is reversed by a preset angle by the drive motor, the method further includes:

[0021] The worm gear is reversed by the drive motor;

[0022] Obtain the reversal angle of the worm gear;

[0023] When the reversal angle is greater than the preset reversal angle, the drive motor is controlled to stop rotating.

[0024] In the eighth possible disassembly and assembly method, the real-time acquisition of the torque and speed of the drive motor is replaced by the real-time acquisition of the operating current and speed of the drive motor.

[0025] The previous method of driving the worm gear to reverse a preset angle by the drive motor when the torque is greater than the preset torque and the speed is less than the preset speed is replaced with driving the worm gear to reverse a preset angle by the drive motor when the operating current is greater than the limit and the speed is less than the preset speed.

[0026] In conjunction with the eighth possible disassembly and assembly method, the ninth possible disassembly and assembly method also includes: driving the worm gear to reverse direction via the drive motor;

[0027] Obtain the reversal angle of the worm gear;

[0028] When the reversal angle is greater than the preset reversal angle, the drive motor is controlled to stop rotating.

[0029] As can be seen from the above technical solutions, the present invention has the following advantages:

[0030] This invention provides a method for assembling and disassembling a peristaltic pump hose. First, a drive motor drives a worm gear that mates with the peristaltic pump hose to rotate clockwise, bringing the hose closer to the pump. Then, the torque and speed of the drive motor are monitored in real time. When the torque is greater than a preset torque and the speed is less than a preset speed, the drive motor drives the worm gear to reverse by a preset angle. This method first increases the torque to prevent installation failure due to insufficient torque. Then, after the peristaltic pump hose is in place, the worm gear is reversed by a certain angle to prevent excessive torque from compressing the hose, ensuring an effective increase in liquid flow and maintaining injection accuracy.

[0031] At the same time, the increased installation torque can prevent the worm from making multiple ineffective rotations due to insufficient torque, thereby avoiding wear on the peristaltic pump and extending the service life of the peristaltic pump hose.

[0032] In addition, increasing the torque to ensure successful installation and driving the worm gear to reverse to ensure that the peristaltic pump hose is not compressed are easier to achieve than precise torque control. Moreover, there is no need to consider the hardness of the peristaltic pump hose and the assembly tolerance of the peristaltic pump, which reduces the motor control precision and installation requirements, reduces the installation failure rate, and improves installation efficiency. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1A flowchart illustrating a method for disassembling and assembling a peristaltic pump hose provided in an embodiment of the present invention;

[0035] Figure 2 This is another schematic diagram of a peristaltic pump hose disassembly and assembly method provided in an embodiment of the present invention;

[0036] Figure 3 This is another schematic diagram of a peristaltic pump hose disassembly and assembly method provided in an embodiment of the present invention. Detailed Implementation

[0037] This invention provides a method for assembling and disassembling a peristaltic pump hose, which solves the technical problem that in the prior art, when installing a peristaltic pump hose by driving a worm gear to rotate with a motor, the installation fails due to insufficient motor torque, while excessive torque leads to reduced injection accuracy.

[0038] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0039] Peristaltic pumps require frequent hose replacements during use. When installing the hose using a worm gear, the torque may be too low or too high. If the motor torque is too low, the hose installation will fail. If the motor torque is too high, the worm gear will compress the hose, preventing the liquid flow rate from being effectively increased during high-speed operation of the peristaltic pump, thus affecting the injection accuracy.

[0040] Please see Figure 1-3 The present invention provides a method for disassembling and assembling a peristaltic pump hose, comprising:

[0041] 10. The worm gear that is engaged with the peristaltic pump hose is driven to rotate forward by the drive motor, so as to move the peristaltic pump hose closer to the peristaltic pump;

[0042] Specifically, in this step, the worm gear that mates with the peristaltic pump hose is positioned between two adjacent layers of helical teeth at the end of the worm gear furthest from the drive motor. Thus, as the helical teeth of the worm gear rotate clockwise, the peristaltic pump hose, limited and guided by the helical teeth, moves axially along the worm gear towards the peristaltic pump, and then gradually enters the installation position under the guidance of the peristaltic pump's guide wheel. The initial torque of the drive motor should be appropriately increased to ensure that the peristaltic pump hose moves axially along the worm gear under the guidance of the helical teeth.

[0043] 20. Real-time acquisition of the drive motor's torque and speed;

[0044] Specifically, since the drive motor and the worm gear are coaxially connected, the torque of the drive motor is the same as the torque of the worm gear, and the speed of the drive motor is the same as the speed of the worm gear. Therefore, by obtaining the torque and speed of the drive motor, we can obtain the real-time torque and speed of the worm gear, and thus determine the installation status of the peristaltic pump hose based on the real-time torque and speed of the worm gear.

[0045] 30. When the torque is greater than the preset torque and the speed is less than the preset speed, the worm gear is reversed by a preset angle by the drive motor.

[0046] Specifically, when the torque of the drive motor is greater than the preset torque and the speed of the drive motor is less than the preset speed, it means that the peristaltic pump hose has been installed in place. That is, the section of the peristaltic pump hose that mates with the roller has been fully inserted into the rolling groove that mates with the roller. More specifically, when the real-time torque of the drive motor is greater than the preset torque, it means that the rotation of the helical teeth can no longer guide the peristaltic pump hose to move axially. The peristaltic pump hose obstructs the rotation of the helical teeth, the rotational resistance of the helical teeth increases, and the rotational speed decreases. At this time, the drive motor drives the worm to reverse the preset angle, thereby preventing the worm from continuing to rotate forward and putting pressure on the peristaltic pump hose, preventing deformation of the peristaltic pump hose part that mates with the worm, and ensuring that the size of the flow channel does not change. The preset torque is an empirical value, determined by factors such as the hardness and size of the peristaltic pump hose. Therefore, the preset torque corresponding to different peristaltic pump hoses needs to be determined through multiple installation tests. For example, the preset torque can be the torque before the torque of the drive motor increases significantly after the section of the peristaltic pump hose that is in contact with the roller has fully entered the rolling groove. The preset speed is the speed at which the drive motor is about to stop rotating. The preset angle needs to be set according to the actual situation. It is necessary to ensure that after the worm gear reverses to the preset angle, the helical teeth do not compress the peristaltic pump hose, and the peristaltic pump hose that is in contact with the helical teeth is still located in the rolling groove.

[0047] The beneficial effects of this embodiment include:

[0048] ① This invention provides a method for assembling and disassembling a peristaltic pump hose. First, a drive motor drives a worm gear that mates with the peristaltic pump hose to rotate clockwise, bringing the hose closer to the peristaltic pump. Then, the torque and speed of the drive motor are acquired in real time. When the torque is greater than a preset torque and the speed is less than a preset speed, the drive motor drives the worm gear to reverse a preset angle. This method first increases the torque to avoid installation failure due to insufficient torque. Then, after the peristaltic pump hose is installed, the worm gear is reversed by a certain angle to prevent excessive torque from compressing the hose, ensuring an effective increase in liquid flow and maintaining injection accuracy.

[0049] ② Increasing the installation torque can prevent the worm from making multiple ineffective rotations due to insufficient torque, thereby avoiding wear on the peristaltic pump and extending the service life of the peristaltic pump hose.

[0050] ③ By increasing the torque to ensure successful installation and driving the worm gear to reverse to ensure that the peristaltic pump hose is not compressed, it is easier to achieve than precise torque control. Moreover, it does not require consideration of the hardness of the peristaltic pump hose and the assembly tolerance of the peristaltic pump, which reduces the motor control precision and installation requirements, reduces the installation failure rate, and improves installation efficiency.

[0051] Step 20, obtaining the torque of the drive motor, includes:

[0052] 21. Obtain the operating current of the drive motor;

[0053] Specifically, the operating current of the drive motor can be collected through a comprehensive motor protection device, a soft starter or frequency converter, or a sensor. The operating current is the current flowing through the drive motor during operation.

[0054] Specifically, since the operating current and torque are directly proportional, the operating current can be used as the judgment condition. That is, "when the operating current exceeds the limit" replaces "when the torque is greater than the preset torque" in step 30, limiting it to a current threshold. The limit can be determined by a similar method to determining the preset torque. In this way, step 22 of calculating the torque can be omitted; the other steps are the same as when using torque as the judgment condition, and will not be repeated.

[0055] 22. Calculate the torque based on the operating current.

[0056] The formula for calculating torque is: T = It / i, where T is the torque, I is the operating current, t is the rated torque of the drive motor, and i is the rated current of the drive motor. Given the rated torque and rated current, substituting the obtained operating current into the aforementioned formula yields the real-time torque of the drive motor.

[0057] In step 20, the speed of the drive motor is obtained by detecting the speed of the drive motor using a speed encoder. The speed encoder can be a photoelectric quadrature encoder or a Hall effect quadrature encoder.

[0058] Specifically: the preset angle A ∈ [55°, 65°], and the optimal value of the preset angle is 60°. The preset speed is a modulation speed of 8%-12%, and the optimal value of the preset speed is 10% of the modulation speed. The modulation speed is the theoretical speed obtained when the drive motor is speed-regulated using PWM.

[0059] The above steps only allow for the installation of the peristaltic pump hose, not its removal. To remove the hose, the following steps must be performed:

[0060] 40. The worm gear is reversed by driving the drive motor;

[0061] Specifically, when replacement is needed, the drive motor can be controlled to reverse the worm gear. When the worm gear reverses, the helical teeth on it also reverse, thereby driving the peristaltic pump hose that meshes with the helical teeth to move along the worm gear axis. More specifically, it drives the peristaltic pump hose to move along the worm gear axis toward the end of the worm gear away from the drive motor. With the help of the guide wheel, the peristaltic pump hose is gradually brought out of the rolling groove.

[0062] 50. Obtain the worm gear's reversal angle;

[0063] Specifically, since the worm gear is coaxially connected to the drive motor, the rotation angle of the drive motor is equal to the rotation angle of the worm gear. Therefore, the rotation angle of the drive motor when it reverses can be obtained by an encoder, thereby obtaining the reversal angle of the worm gear.

[0064] 60. When the reversal angle is greater than the preset reversal angle, control the drive motor to stop rotating.

[0065] The preset reversal angle is theoretically greater than or equal to the product of the number of helical turns of the worm gear and 2π. This ensures that after the worm gear rotates to the preset reversal angle, the peristaltic pump hose has completely exited the rolling groove and is no longer limited by the roller.

[0066] It should be understood that steps 10, 20, 30, 40, 50, and 60 form a cycle. The installation steps of the peristaltic pump hoses 10, 20, and 30 can be performed sequentially after the peristaltic pump hose disassembly and assembly steps 40, 50, and 60, i.e., 40→50→60→10→20→30, or sequentially before the peristaltic pump hose disassembly and assembly steps 40, 50, and 60, i.e., 10→20→30→40→50→60.

[0067] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0068] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0069] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for disassembling and assembling a peristaltic pump hose, characterized in that, include: The worm gear that works with the peristaltic pump hose is driven to rotate forward by a drive motor, so as to move the peristaltic pump hose closer to the peristaltic pump; Real-time acquisition of the torque of the drive motor includes: acquiring the operating current of the drive motor and calculating the torque based on the operating current, T=It / i; Where T is the torque, I is the operating current, t is the rated torque of the drive motor, and i is the rated current of the drive motor; The rotational speed of the drive motor is acquired in real time; When the torque is greater than the preset torque and the rotation speed is less than the preset rotation speed, the worm gear is driven to reverse by the drive motor at a preset angle. After the worm gear is driven to reverse a preset angle by the drive motor, the method further includes: driving the worm gear to reverse by the drive motor; obtaining the reverse angle of the worm gear; when the reverse angle is greater than the preset reverse angle, controlling the drive motor to stop rotating; the preset speed is a modulation speed of 8%-12%, and the modulation speed is the theoretical speed obtained when the drive motor is speed-regulated using PWM method; The preset angle A ∈ [55°, 65°].

2. The method for disassembling and assembling a peristaltic pump hose according to claim 1, characterized in that, Obtaining the rotational speed of the drive motor includes: The rotational speed of the drive motor is detected by a speed encoder.

3. The method for disassembling and assembling a peristaltic pump hose according to claim 2, characterized in that: The speed encoder is a photoelectric quadrature encoder or a Hall quadrature encoder.

4. The method for disassembling and assembling a peristaltic pump hose according to claim 1, characterized in that: Replace the real-time acquisition of the torque and speed of the drive motor with the real-time acquisition of the operating current and speed of the drive motor; The previous method of driving the worm gear to reverse a preset angle by the drive motor when the torque is greater than the preset torque and the rotation speed is less than the preset rotation speed is replaced with driving the worm gear to reverse a preset angle by the drive motor when the operating current is greater than the limit and the rotation speed is less than the preset rotation speed.

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