A plunger metering pump and glue filling equipment

Abstract

The present application discloses a plunger metering pump and glue filling equipment, which relates to the technical field of liquid metering devices, wherein the plunger metering pump comprises: a pump body, a plunger and a detection device, wherein a pump chamber is provided in the pump body; the plunger is arranged in the pump body, and one end of the plunger can be movably inserted in the pump chamber, and the plunger is used to pump out the liquid in the pump chamber; the detection device comprises a magnetic induction sensor and a magnetic part; the magnetic part is connected to the plunger and can move with the plunger, and the magnetic induction sensor is arranged on the outer side of the pump body, and is used to reflect the position of the plunger according to the detected magnetic field strength. The present application can not only realize precise control of the liquid output, but also reduce the risk of leakage pollution and improve the stability of operation.

Description

Technical Field

[0001] The present application relates to the technical field of liquid metering devices, and in particular to a plunger metering pump and glue filling equipment. Background Art

[0002] A metering pump with a plunger, also known as a plunger metering pump, is a special metering device whose core working principle is to use the reciprocating motion of the plunger to achieve the suction and discharge of liquid. However, when it is necessary to control the metering pump to achieve quantitative output of liquid, the amount of liquid output can only be ensured to be equal when the displacement of the plunger remains consistent each time.

[0003] In the related art, the displacement of the plunger is monitored by means of photoelectric sensing. The specific method is to provide a baffle at the plunger, and to provide a sliding groove on the outer wall of the pump body and a photoelectric sensor on the side of the sliding groove. The baffle passes through the sliding groove. When the plunger moves, the baffle will block or reflect the light beam emitted by the photoelectric sensor as the plunger moves. The photoelectric sensor can accurately obtain the current position information of the plunger by detecting the change of the light beam. The sliding groove is provided on the outer wall of the pump body, which not only increases the complexity of the pump body structure, but also may cause the liquid in the pump body to leak out through the sliding groove and cause pollution. At the same time, impurities such as external dust may also enter the pump body through the wiring hole, affecting the stability of the pump body. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a plunger metering pump and a glue filling device, which can not only accurately control the liquid output, but also reduce the risk of leakage and pollution and improve the stability of operation.

[0005] In the first aspect, the present application provides a plunger metering pump, comprising: a pump body, a plunger and a detection device, wherein a pump chamber is provided in the pump body; the plunger is arranged in the pump body, and one end of the plunger is movably inserted in the pump chamber, and the plunger is used to pump out the liquid in the pump chamber; the detection device comprises a magnetic induction sensor and a magnetic part; the magnetic part is connected to the plunger and can move with the plunger, the magnetic induction sensor is arranged on the outer side of the pump body, and is used to reflect the position of the plunger according to the detected magnetic field strength.

[0006] The plunger metering pump according to the embodiment of the first aspect of the present application has at least the following beneficial effects: the plunger can be movably inserted in the pump chamber, and when the plunger is compressed in the direction of the pump chamber, the liquid in the pump chamber will be squeezed out of the pump chamber. The magnetic induction sensor is arranged on the peripheral side of the pump body, and a magnetic part is arranged on the plunger. The metering pump can use the change of magnetic field strength to reflect the position of the plunger. The magnetic induction sensor is used to perform position detection in a non-contact manner. Because magnetic induction is not easily disturbed by external environmental factors (such as dust, humidity, etc.), it will perform better in certain harsh working environments. Compared with the traditional photoelectric induction method, the magnetic induction method has higher stability and durability. In addition, the magnetic induction sensor can be directly arranged on the peripheral side of the pump body, and the wiring only needs to be completed on the outside of the pump body, avoiding the need to open a sliding groove or wiring hole on the outer wall of the pump body, thereby reducing the complexity of the pump body structure and reducing the risk of liquid leakage and external impurities entering the pump body.

[0007] According to some embodiments of the first aspect of the present application, the magnetic induction sensor includes a first sensor and a second sensor; when the plunger is located at a preset initial position, the position of the magnetic member corresponds to the position of the first sensor; when the plunger is located at a preset end position, the position of the magnetic member corresponds to the position of the second sensor.

[0008] According to some embodiments of the first aspect of the present application, the first sensor and the second sensor are slidably disposed on the outer side surface of the pump body along the length direction of the plunger.

[0009] According to some embodiments of the first aspect of the present application, an outer wall of the pump body is provided with a mounting groove along the length direction of the plunger, and the first sensor and the second sensor are detachably disposed in the mounting groove.

[0010] According to some embodiments of the first aspect of the present application, a transmission assembly is further included. A closed cavity is also provided in the pump body. The closed cavity is located on one side of the pump chamber. The transmission assembly is located in the closed cavity and is connected to the plunger, and is used to drive the plunger to move within the pump body.

[0011] According to some embodiments of the first aspect of the present application, it also includes a driving member, which is arranged on the pump body, and the transmission assembly includes a screw and a nut assembly. The end of the screw away from the pump chamber passes through the closed cavity and is connected to the driving end of the driving member, the nut assembly is threadedly connected to the screw, the end of the plunger away from the pump chamber is connected to the nut assembly, the magnetic member is arranged on the nut assembly, and a limiting structure for preventing the nut assembly from rotating is provided in the closed cavity.

[0012] According to some embodiments of the first aspect of the present application, the nut assembly is provided with a receiving groove, and the magnetic member is arranged in the receiving groove.

[0013] According to some embodiments of the first aspect of the present application, there is a gap between the magnetic member and the closed cavity.

[0014] According to some embodiments of the first aspect of the present application, an avoidance groove is provided at one end of the plunger close to the driving member, and one end of the screw close to the pump chamber extends into the avoidance groove, and the avoidance groove is used to prevent the plunger from contacting the screw.

[0015] In a second aspect, the present application also provides a glue filling device, comprising a plunger metering pump as described in any embodiment of the first aspect.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 A schematic diagram of the structure of a plunger metering pump provided in some embodiments of the present application;

[0019] Figure 2 A front schematic diagram of a plunger metering pump provided in some embodiments of the present application;

[0020] Figure 3 For this application Figure 2 Section view about section line AA;

[0021] Figure 4 For this application Figure 3 Schematic diagram of the enlarged structure of area B.

[0022] The figures are as follows:

[0023] Pump body 100; pump chamber 110; liquid outlet channel 120; closed cavity 130; magnetic induction sensor 140; first sensor 141; second sensor 142; gap 150; installation slot 160; plunger 210; avoidance slot 211; transmission assembly 220; screw 221; nut assembly 222; drive member 230; magnetic member 240. DETAILED DESCRIPTION

[0024] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0025] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0028] A metering pump with a plunger, also known as a plunger metering pump, is a special metering device whose core working principle is to use the reciprocating motion of the plunger to achieve the suction and discharge of liquid. This pump has the characteristics of simple structure, high temperature and high pressure resistance, and its flow rate can be dynamically adjusted within the range of 0% to 100%, thereby meeting the needs of different application scenarios.

[0029] However, when it is necessary to control the metering pump to achieve quantitative output of liquid, it is particularly important to accurately monitor the displacement of the plunger. Only when the displacement of the plunger remains consistent each time can the amount of liquid output be guaranteed to be equal. In the prior art, there are many methods for monitoring the displacement of the plunger, among which the method of monitoring by photoelectric sensing has attracted much attention.

[0030] For example, monitoring is performed by photoelectric sensing. Specifically, a baffle is provided at the plunger, and a photoelectric sensor is provided in the chamber inside the pump body. When the plunger moves, the baffle will block or reflect the light beam emitted by the photoelectric sensor as the plunger moves. The photoelectric sensor detects the change of the light beam. In order to realize the wiring of the photoelectric sensor, it is necessary to open a wiring hole on the outer wall of the pump body. In addition, a sliding groove can be opened on the outer wall of the pump body and a photoelectric sensor can be provided on the side of the sliding groove. The baffle passes through the sliding groove to accurately obtain the current position information of the plunger. This not only increases the complexity of the pump body structure, but also may cause the liquid in the pump body to leak out through the wiring hole and cause pollution. At the same time, external dust and other impurities may also enter the pump body through the wiring hole, affecting the stability of the pump body.

[0031] Based on this, the present application provides a plunger metering pump and a glue filling device to solve the above-mentioned technical problems. The technical solution provided by the present application is further described in detail below.

[0032] In the first aspect, the present application provides a plunger metering pump, including a pump body 100, a plunger 210 and a detection device, wherein a pump chamber 110 is provided in the pump body 100; the plunger 210 is arranged in the pump body 100, and one end of the plunger 210 can be movably inserted in the pump chamber 110, and the plunger 210 is used to pump out the liquid in the pump chamber 110; the detection device includes a magnetic induction sensor 140 and a magnetic member 240; the magnetic member 240 is connected to the plunger 210 and can move with the plunger 210, the magnetic induction sensor 140 is arranged on the outer side of the pump body 100, and is used to reflect the position of the plunger 210 according to the detected magnetic field strength.

[0033] The plunger 210 can be movably inserted in the pump chamber 110. When the plunger 210 is compressed in the direction of the pump chamber 110, the liquid in the pump chamber 110 will be squeezed out of the pump chamber 110. The magnetic induction sensor 140 is arranged on the peripheral side of the pump body 100, and the magnetic member 240 is arranged on the plunger 210. The metering pump can use the change of magnetic field strength to reflect the position of the plunger 210. The magnetic induction sensor 140 is used to detect the position in a non-contact manner. Because magnetic induction is not easily disturbed by external environmental factors (such as dust, humidity, etc.), it will perform better in some harsh working environments. Compared with the traditional photoelectric induction method, the magnetic induction method has higher stability and durability. In addition, the magnetic induction sensor 140 can be directly arranged on the peripheral side of the pump body 100, and the wiring only needs to be completed on the outside of the pump body 100, avoiding the need to open a sliding groove or a wiring hole on the outer wall of the pump body 100, thereby reducing the complexity of the structure of the pump body 100 and reducing the risk of liquid leakage and external impurities entering the pump body 100.

[0034] Reference Figure 1It can be understood that the magnetic induction sensor 140 includes a first sensor 141 and a second sensor 142; when the plunger 210 is located at a preset initial position, the position of the magnetic member 240 corresponds to the position of the first sensor 141; when the plunger 210 is located at a preset end position, the position of the magnetic member 240 corresponds to the position of the second sensor 142. That is, the distance between the first sensor 141 and the second sensor 142 is equal to the preset displacement of the plunger 210. By setting the first sensor 141 and the second sensor 142, and corresponding to the preset displacement of the plunger 210, precise control of the displacement of the plunger 210 can be achieved. Since the magnetic induction sensor 140 has the characteristic of fast response, the sensor can respond quickly when the magnetic member 240 approaches or moves away from the sensor. By setting two magnetic induction sensors 140, reliable detection of the starting and ending positions of the reciprocating motion can be achieved. When the magnetic member 240 triggers one of the sensors, the system can determine that the reciprocating motion has started; when the magnetic member 240 triggers another sensor, the system can determine that the reciprocating motion has ended, thereby improving the motion accuracy and reliability of the entire system.

[0035] It is understandable that the first sensor 141 and the second sensor 142 are slidably disposed on the outer side of the pump body 100 along the length direction of the plunger 210. The magnetic induction sensor 140 has a certain installation position adjustment space in the transmission direction of the plunger 210. When the amount of liquid quantitatively output by the metering pump needs to be changed, the distance between the first sensor 141 and the second sensor 142 can be changed, thereby improving the flexibility of the metering pump in different scenarios.

[0036] Continue to refer to Figure 1 It can be understood that the outer wall of the pump body 100 is provided with an installation slot 160 along the length direction of the plunger 210, and the magnetic induction sensor 140 is detachably arranged in the installation slot 160. By providing the installation slot 160 on the outer wall of the pump body 100, the magnetic induction sensor 140 can be easily installed and removed, so that the adjustment of the installation position of the sensor becomes simple, and the maintenance and replacement of the sensor are also convenient. At the same time, the design of the installation slot 160 allows the magnetic induction sensor 140 to have a certain installation position adjustment space in the transmission direction of the plunger 210, so it can adapt to different installation requirements and scenarios, and the use is more flexible. In addition, since the first sensor 141 and the second sensor 142 are precision detection devices, the installation slot 160 can be provided so that the first sensor 141 and the second sensor 142 can be hidden in the installation slot 160, or the surface of the first sensor 141 and the second sensor 142 can be flush with the surface of the pump body 100, so as to prevent the first sensor 141 and the second sensor 142 from being damaged due to external collision during use.

[0037] Reference Figure 3It is understandable that the plunger metering pump provided in the present application further includes a transmission assembly 220, and a closed cavity 130 is further provided in the pump body 100, and the closed cavity 130 is located on one side of the pump chamber 110, and the transmission assembly 220 is located in the closed cavity 130 and connected to the plunger 210, and is used to drive the plunger 210 to move in the pump body 100. The transmission assembly 220 can be a screw transmission structure, a gear set transmission structure, a chain sprocket transmission structure, etc., which is not limited in the present application. The closed cavity 130 is filled with lubricant, which can reduce the rolling resistance and sliding friction of the transmission assembly 220, optimize the transmission performance of the transmission assembly 220, and can reduce the noise and heat generated by friction of the transmission assembly 220, so that the pump body 100 works more smoothly. In addition, a sealing structure is provided between the closed cavity 130 and the pump chamber 110 to prevent the liquid in the pump chamber 110 from flowing into the closed cavity 130 and affecting the operation of the transmission assembly 220, or to prevent the lubricant in the closed cavity 130 from flowing into the pump chamber 110, causing the liquid in the pump chamber 110 to be impure and affecting the performance of the output liquid.

[0038] Reference Figure 4 It can be understood that the plunger metering pump provided by the present application further includes a driving member 230, which is arranged on the pump body 100, and the transmission assembly 220 includes a screw 221 and a nut assembly 222. The end of the screw 221 away from the pump chamber 110 passes through the closed cavity 130 and is connected to the driving end of the driving member 230. The nut assembly 222 is threadedly connected to the screw 221, and the end of the plunger 210 away from the pump chamber 110 is connected to the nut assembly 222. The magnetic member 240 is arranged on the nut assembly 222, and a limiting structure for blocking the rotation of the nut assembly 222 is provided in the closed cavity 130. Through the combination of the transmission assembly 220 and the driving member 230, the stroke of the plunger 210 can be accurately controlled, and the flow rate of the pump can be more accurately adjusted to meet the needs of different application scenarios. A limiting structure is provided in the closed cavity 130 to prevent the nut assembly 222 from rotating, which ensures that when the screw 221 rotates, the nut assembly 222 can only move linearly along the screw 221 without rotating, thereby driving the plunger 210 and the pump body 100 to move. The magnetic member 240 is arranged on the nut assembly 222 instead of being directly arranged on the plunger 210, so as to avoid the plunger 210 from being worn when moving back and forth between the closed cavity 130 and the pump chamber 110.

[0039] Reference Figure 4It can be understood that a receiving groove is provided on the outer side of the nut assembly 222, and the magnetic member 240 is arranged in the receiving groove. By setting the receiving groove, the magnetic member 240 is effectively protected to prevent the magnetic member 240 from being directly impacted, rubbed or damaged by the outside during use, thereby ensuring its long-term stable operation. In addition, the receiving groove not only provides space for the magnetic member 240, but also plays a role in positioning and fixing the magnetic member 240, so that the position of the magnetic member 240 on the nut assembly 222 is more accurate and stable, and it is not easy to shift or fall off.

[0040] Continue to refer to Figure 4 It is understandable that there is a gap 150 between the magnetic member 240 and the closed cavity 130. The existence of the gap 150 can avoid direct contact between the magnetic member 240 and the closed cavity 130, thereby preventing the magnetic member 240 from being damaged by friction or collision during operation, thereby extending the service life of the magnetic member 240 and maintaining its stable magnetic properties.

[0041] Reference Figure 3 It is understandable that the end of the plunger 210 close to the driving member 230 is provided with an avoidance groove 211, and the other end of the screw 221 extends into the avoidance groove 211, and the avoidance groove 211 is used to prevent the plunger 210 from contacting the screw 221. The avoidance groove 211 needs to ensure that the plunger 210 and the screw 221 will not directly contact each other during the entire process of the plunger 210 moving from the initial position to the preset position, that is, when the plunger 210 moves with the nut assembly 222, the other end of the screw 221 is always in the avoidance groove 211, so as to avoid the screw 221 colliding with the plunger 210 when rotating, thereby causing the plunger 210 to shift or shake, affecting the liquid discharge result.

[0042] Reference Figure 3 It is understandable that the inlet end of the liquid outlet flow channel is connected to the top of the pump chamber 110. In the process of the plunger 210 moving forward to the pump chamber 110, if there is air in the pump chamber 110, due to the compressibility of the air, even if the plunger 210 completes its expected compression stroke, the amount of liquid ejected from the pump chamber 110 will be less than the specified value. The inlet end of the liquid outlet flow channel is connected to the top of the pump chamber 110. When the plunger 210 is pressed down, it can ensure that any air or bubbles accumulated at the top will be discharged first before the liquid in the pump chamber 110 is completely pushed out. Therefore, when using the vertical metering pump for infusion, it is necessary to control the plunger 210 to reciprocate several times in the pump chamber 110 until all the gas in the pump chamber 110 is discharged from the liquid outlet flow channel. By preferentially discharging the air or bubbles in the pump chamber 110, the possibility of bubbles entering the output liquid can be effectively reduced, thereby improving the accuracy of liquid output metering, and eliminating the interference of bubbles on the work of the metering pump.

[0043] In the second aspect, the present application further provides a glue filling device, including the plunger metering pump of any one embodiment of the first aspect. The function and principle of the glue filling device of this embodiment are based on the above plunger metering pump, so the glue filling device of this embodiment has the same beneficial effects as the above plunger metering pump, and will not be repeated here to save space.

[0044] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. A plunger metering pump, characterized in that: include: A pump body, wherein a pump chamber is provided in the pump body; A plunger is disposed in the pump body, and one end of which is movably inserted into the pump chamber, and the plunger is used to pump out the liquid in the pump chamber; The detection device includes a magnetic induction sensor and a magnetic component; the magnetic component is connected to the plunger and can move with the plunger; the magnetic induction sensor is arranged on the outer side of the pump body and is used to reflect the position of the plunger according to the detected magnetic field strength.

2. The plunger metering pump according to claim 1, characterized in that: The magnetic induction sensor includes a first sensor and a second sensor; when the plunger is located at a preset initial position, the position of the magnetic member corresponds to the position of the first sensor; when the plunger is located at a preset end position, the position of the magnetic member corresponds to the position of the second sensor.

3. The plunger metering pump according to claim 2, characterized in that: The first sensor and the second sensor are slidably arranged on the outer side surface of the pump body along the length direction of the plunger.

4. The plunger metering pump according to claim 3, characterized in that: An outer wall of the pump body is provided with a mounting groove along the length direction of the plunger, and the first sensor and the second sensor are detachably arranged in the mounting groove.

5. The plunger metering pump according to claim 1, characterized in that: It also includes a transmission component. A closed cavity is also provided in the pump body. The closed cavity is located on one side of the pump chamber. The transmission component is located in the closed cavity and is connected to the plunger and is used to drive the plunger to move in the pump body.

6. The plunger metering pump according to claim 5, characterized in that: It also includes a driving member, which is arranged on the pump body. The transmission assembly includes a screw and a nut assembly. The end of the screw away from the pump chamber passes through the closed cavity and is connected to the driving end of the driving member. The nut assembly is threadedly connected to the screw, and the end of the plunger away from the pump chamber is connected to the nut assembly. The magnetic member is arranged on the nut assembly, and a limiting structure is provided in the closed cavity to prevent the nut assembly from rotating.

7. The plunger metering pump according to claim 6, characterized in that: The nut assembly is provided with a receiving groove, and the magnetic member is arranged in the receiving groove.

8. The plunger metering pump according to claim 7, characterized in that: There is a gap between the magnetic member and the closed cavity.

9. The plunger metering pump according to claim 6, characterized in that: An escape groove is provided at one end of the plunger close to the driving member, and one end of the screw rod close to the pump chamber extends into the escape groove. The escape groove is used to prevent the plunger from contacting the screw rod.

10. A glue filling device, characterized in that: It comprises a plunger metering pump as described in any one of claims 1 to 9.

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