Double-line stirring rod pump and pump head thereof

Abstract

The utility model relates to a double-line stirring rod pump and a pump head thereof. The stable detection of the liquid level of the double-line pump can be realized. Comprising an output shaft, a stirring rod, an oil distribution disc, a low-liquid-level detection mechanism and a guide rail, the low-liquid-level detection mechanism comprises a swing assembly and a magnetic induction sensor, the swing assembly comprises a fixed plate connected with the output shaft and a rotating plate hinged to the fixed plate, and a permanent magnet extending in the direction of the oil distribution disc is arranged at the front end of the rotating plate; the permanent magnet has a first limit position and a second limit position which are farthest and closest to the output shaft during movement, a probe of the magnetic induction sensor is located on a circle which corresponds to the first limit position of the permanent magnet and takes the output shaft as a circle center, and a grease pushing plate is arranged on the swing assembly; the guide rail is located on the upper portion of the oil distribution disc and is in a semi-oval shape, the center of the oval is close to the axis of the output shaft, the side face of the guide rail is used for being in guiding fit with a part of the swing assembly to enable the swing assembly to return to the first limit position from the second limit position, and the magnetic induction sensor is far away from the farthest end of the guide rail.

Description

Technical Field

[0001] This utility model relates to a double-line stirring bar pump and its pump head. Background Technology

[0002] The dual-line agitator pump is a key component of a centralized lubrication system. It delivers lubricating grease to various parts of the equipment requiring lubrication via pipelines at fixed times, locations, and quantities. The dual-line agitator pump mainly consists of an oil tank and a pump head. The pump head primarily includes a motor, reduction gear, transmission mechanism, plunger assembly, distribution plate, rotating pressure plate, and agitator. The output shaft of the transmission mechanism extends from bottom to top into the oil tank above the distribution plate. The agitator is fixed to the output shaft and rotates with it. As the agitator rotates close to the inner wall of the oil tank, it scrapes off the grease adhering to the inner wall, temporarily dispensing lubricating grease into the oil tank. The rotating pressure plate is fixedly mounted on the output shaft and rotates with the output shaft to squeeze the grease in the oil tank downwards, so that the plunger pair can better draw the grease. The motor of the dual-line stirring pump needs to rotate forward and reverse to switch the oil outlet, so the rotating pressure plate also needs to rotate forward and reverse accordingly. For the specific structure of the rotating pressure plate, please refer to the publication content of application publication number CN110529719A. Its rotating pressure plate (seesaw assembly) can swing to squeeze the grease facing the oil surface when rotating forward and reverse due to the resistance of the grease.

[0003] Before the grease in the oil tank runs out, it needs to be replaced promptly to ensure uninterrupted operation of the lubrication system and prevent damage to the equipment due to insufficient lubrication. However, because the rotating pressure plate of the dual-line agitator pump swings in different directions during forward and reverse rotation, traditional methods struggle to consistently monitor the oil level in the tank. This makes it difficult to promptly remind maintenance personnel to replenish the grease, leading to a failure of the lubrication system to properly supply grease to the equipment and posing a significant risk of equipment damage. Utility Model Content

[0004] The purpose of this invention is to provide a pump head that can stably detect low liquid levels in an oil tank. Another purpose of this invention is to provide a double-line agitator pump using the above-mentioned pump head.

[0005] The technical solution of the pump head of this utility model is as follows: The pump head includes:

[0006] Pump base;

[0007] The transmission mechanism includes an output shaft extending upward from the pump base into the oil tank;

[0008] The stirring rod is rotatably mounted on the output shaft;

[0009] The oil distribution plate is located below the agitator.

[0010] The low liquid level detection mechanism includes a swing assembly and a magnetic induction sensor. The swing assembly includes a fixed plate connected to the output shaft and rotating with the output shaft, and a rotating plate hinged to the outer end of the fixed plate. The front end of the rotating plate is provided with a permanent magnet extending towards the oil distribution plate. During the movement, the permanent magnet has a first and a second limit position, which are the farthest and the closest to the output shaft, respectively. The probe of the magnetic induction sensor is located on a circle centered on the output shaft corresponding to the first limit position of the permanent magnet. The swing assembly is provided with a grease pusher plate for grease to push its swing.

[0011] The guide rail, located above the oil distribution plate, is semi-elliptical, with the center of the ellipse positioned close to the axis of the output shaft. The side of the guide rail is used to guide and engage with a portion of the swing assembly to cause the swing assembly to return from the second limit position to the first limit position. The farthest point on the guide rail from the output shaft is defined as the farthest point, and the magnetic induction sensor is positioned away from the farthest point.

[0012] When the output shaft rotates forward, if there is a lot of grease, the grease pusher plate rotating with the output shaft will rotate due to the thrust of the grease, causing the permanent magnet to be in the second limit position, and the permanent magnet will be out of the sensing range of the magnetic induction sensor. If there is a little grease, the permanent magnet in the first limit position after being reset by the guide rail will not be able to switch to the second limit position due to the thrust of the grease applied to the grease pusher plate. The magnetic induction sensor can then detect the permanent magnet passing above it to trigger a low liquid level alarm. When the output shaft rotates in reverse, the acquisition of the magnetic induction sensor signal will stop.

[0013] The beneficial effects of this technical solution are as follows: To achieve stable detection of low liquid level alarm in a dual-line agitator pump, this application achieves this through the coordinated operation of components such as the low liquid level alarm assembly, guide rail, and control module. Because the motor of the dual-line agitator pump needs to frequently rotate forward and backward, this application only utilizes the forward rotation of the motor for low liquid level detection. While sensor signals are collected during reverse rotation, they are not used for judgment because the motor quickly switches back to forward rotation after reversing. Detecting the low liquid level during forward rotation will not significantly affect the system, thus not delaying low liquid level detection. Under this premise, the solution of detecting the low liquid level only during forward motor rotation can effectively reduce costs and the number of components required for low liquid level detection. Specifically, when the motor rotates forward, the output shaft drives the oscillating assembly and agitator to rotate. The oscillating assembly, after passing through… When the grease is on the guide rail, it can be slowly guided back to the first limit position. Subsequently, if there is a lot of grease in the oil tank, the resistance from the grease on the push plate is greater, causing the permanent magnet to rotate to the second limit position. At this time, when it passes the magnetic induction sensor, the magnetic induction sensor cannot detect the permanent magnet, so there will be no low level alarm. When there is little grease in the oil tank, the pushing force of the grease on the push plate passing through the guide rail is less, which is insufficient to push the permanent magnet to switch to the second limit position. At this time, the permanent magnet, which is still in the first limit position or near the first limit position, can be detected by the magnetic induction sensor when it passes through the magnetic induction sensor, and the feedback is sent to the controller to execute the low level alarm, reminding that the amount of grease in the oil tank is too low. When the motor reverses, regardless of the amount of grease, although the magnetic induction sensor detects the permanent magnet, this information is not processed. On the other hand, the special structure of the guide rail in this application allows the rotating plate to rotate slowly along an arc-shaped curve when being guided. In both forward and reverse rotation, the rotating plate is guided slowly along the same curve, avoiding the rotating plate from being subjected to large impacts and thus aggravating wear, thereby improving the service life of the low liquid level detection mechanism.

[0014] Furthermore, a seesaw assembly that rotates with the output shaft is mounted on it, with a minimum distance of more than 1mm between the seesaw assembly and the guide rail when rotating. The purpose of this arrangement is to bring the guide rail as close to the output shaft as possible while avoiding interference between the guide rail and the seesaw assembly, thereby providing sufficient space for the installation of the magnetic induction sensor and the swing assembly.

[0015] Furthermore, the permanent magnet is tubular, and a rotating shaft is vertically mounted on the rotating plate. The permanent magnet is rotatably mounted on the rotating shaft, and its outer surface rolls against the outer surface of the guide rail. This design allows the permanent magnet and guide rail to roll rather than slide, thereby reducing wear during component contact. When the guide rail guides the rotating plate, the grease-push plate of the rotating plate also experiences resistance from the grease, resulting in significant pressure at the contact point between the rotating plate and the guide rail. If sliding friction were used, wear would be rapid, affecting service life. Switching to rolling friction greatly reduces friction and significantly lowers the wear rate.

[0016] Furthermore, the guide rail has a rectangular cross-section, which increases the contact area with the rotating plate and improves its load-bearing capacity.

[0017] Furthermore, the magnetic induction sensor is a reed switch.

[0018] Furthermore, the permanent magnet is a neodymium iron boron magnet.

[0019] Furthermore, the surface of the grease-expanding plate is set parallel to the axis of the output shaft.

[0020] The technical solution of this utility model's dual-line agitator pump is as follows: The dual-line agitator pump includes a pump head and an oil tank installed at the upper opening of the pump head. The pump head includes:

[0021] Pump base;

[0022] The transmission mechanism includes an output shaft extending upward from the pump base into the oil tank;

[0023] The stirring rod is rotatably mounted on the output shaft;

[0024] The oil distribution plate is located below the agitator.

[0025] The low liquid level detection mechanism includes a swing assembly and a magnetic induction sensor. The swing assembly includes a fixed plate connected to the output shaft and rotating with the output shaft, and a rotating plate hinged to the outer end of the fixed plate. The front end of the rotating plate is provided with a permanent magnet extending towards the oil distribution plate. During the movement, the permanent magnet has a first and a second limit position, which are the farthest and the closest to the output shaft, respectively. The probe of the magnetic induction sensor is located on a circle centered on the output shaft corresponding to the first limit position of the permanent magnet. The swing assembly is provided with a grease pusher plate for grease to push its swing.

[0026] The guide rail, located above the oil distribution plate, is semi-elliptical, with the center of the ellipse positioned close to the axis of the output shaft. The side of the guide rail is used to guide and engage with a portion of the swing assembly to cause the swing assembly to return from the second limit position to the first limit position. The farthest point on the guide rail from the output shaft is defined as the farthest point, and the magnetic induction sensor is positioned away from the farthest point.

[0027] When the output shaft rotates forward, if there is a lot of grease, the grease pusher plate rotating with the output shaft will rotate due to the thrust of the grease, causing the permanent magnet to be in the second limit position, and the permanent magnet will be out of the sensing range of the magnetic induction sensor. If there is a little grease, the permanent magnet in the first limit position after being reset by the guide rail will not be able to switch to the second limit position due to the thrust of the grease applied to the grease pusher plate. The magnetic induction sensor can then detect the permanent magnet passing above it to trigger a low liquid level alarm. When the output shaft rotates in reverse, the acquisition of the magnetic induction sensor signal will stop.

[0028] The beneficial effects of this technical solution are as follows: To achieve stable detection of low liquid level alarm in a dual-line agitator pump, this application achieves this through the coordinated operation of components such as the low liquid level alarm assembly, guide rail, and control module. Because the motor of the dual-line agitator pump needs to frequently rotate forward and backward, this application only utilizes the forward rotation of the motor for low liquid level detection. While sensor signals are collected during reverse rotation, they are not used for judgment because the motor quickly switches back to forward rotation after reversing. Detecting the low liquid level during forward rotation will not significantly affect the system, thus not delaying low liquid level detection. Under this premise, the solution of detecting the low liquid level only during forward motor rotation can effectively reduce costs and the number of components required for low liquid level detection. Specifically, when the motor rotates forward, the output shaft drives the oscillating assembly and agitator to rotate. The oscillating assembly, after passing through… When the grease is on the guide rail, it can be slowly guided back to the first limit position. Subsequently, if there is a lot of grease in the oil tank, the resistance from the grease on the push plate is greater, causing the permanent magnet to rotate to the second limit position. At this time, when it passes the magnetic induction sensor, the magnetic induction sensor cannot detect the permanent magnet, so there will be no low level alarm. When there is little grease in the oil tank, the pushing force of the grease on the push plate passing through the guide rail is less, which is insufficient to push the permanent magnet to switch to the second limit position. At this time, the permanent magnet, which is still in the first limit position or near the first limit position, can be detected by the magnetic induction sensor when it passes through the magnetic induction sensor, and the feedback is sent to the controller to execute the low level alarm, reminding that the amount of grease in the oil tank is too low. When the motor reverses, regardless of the amount of grease, although the magnetic induction sensor detects the permanent magnet, this information is not processed. On the other hand, the special structure of the guide rail in this application allows the rotating plate to rotate slowly along an arc-shaped curve when being guided. In both forward and reverse rotation, the rotating plate is guided slowly along the same curve, avoiding the rotating plate from being subjected to large impacts and thus aggravating wear, thereby improving the service life of the low liquid level detection mechanism.

[0029] Furthermore, a seesaw assembly that rotates with the output shaft is mounted on it, with a minimum distance of more than 1mm between the seesaw assembly and the guide rail when rotating. The purpose of this arrangement is to bring the guide rail as close to the output shaft as possible while avoiding interference between the guide rail and the seesaw assembly, thereby providing sufficient space for the installation of the magnetic induction sensor and the swing assembly.

[0030] Furthermore, the permanent magnet is tubular, and a rotating shaft is vertically mounted on the rotating plate. The permanent magnet is rotatably mounted on the rotating shaft, and its outer surface rolls against the outer surface of the guide rail. This design allows the permanent magnet and guide rail to roll rather than slide, thereby reducing wear during component contact. When the guide rail guides the rotating plate, the grease-push plate of the rotating plate also experiences resistance from the grease, resulting in significant pressure at the contact point between the rotating plate and the guide rail. If sliding friction were used, wear would be rapid, affecting service life. Switching to rolling friction greatly reduces friction and significantly lowers the wear rate.

[0031] Furthermore, the guide rail has a rectangular cross-section, which increases the contact area with the rotating plate and improves its load-bearing capacity.

[0032] Furthermore, the magnetic induction sensor is a reed switch.

[0033] Furthermore, the permanent magnet is a neodymium iron boron magnet.

[0034] Furthermore, the surface of the grease-expanding plate is set parallel to the axis of the output shaft. Attached Figure Description

[0035] Figure 1 This is a perspective view of a specific embodiment of a pump head according to the present invention;

[0036] Figure 2 for Figure 1 A top view of the permanent magnet in its first extreme position (the oil passage on the oil distribution plate is omitted).

[0037] Figure 3 for Figure 1 A top view of the permanent magnet in its second extreme position (the oil passage on the oil distribution plate is omitted).

[0038] In the diagram: 1-Pump base, 2-Output shaft, 3-Seesaw assembly, 4-Oil distribution plate, 41-Guide rail, 411-Farthest end, 5-Stirring rod, 6-Low liquid level detection mechanism, 61-Magnetic induction sensor, 621-Fixed plate, 622-Rotating plate, 623-Hinge shaft, 624-Rotating shaft, 625-Permanent magnet, 626-Pushing plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0042] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0043] A specific embodiment of the pump head of this utility model: The pump head, as the core part of the double-line stirring bar pump, mainly includes a pump base 1, a transmission mechanism, a stirring bar 5, a seesaw assembly 3, an oil distribution plate 4, a low liquid level detection mechanism 6, and a monitor, motor, reduction mechanism, eccentric wheel mechanism, plunger pair, etc. (not shown in the figure).

[0044] Pump base 1 includes the pump casing and its internal cavity, while most other components within the pump head are mounted outside the pump casing or inside the internal cavity. For example... Figure 1 As shown, the upper part of the pump base 1 has an opening in the inner cavity, and an oil distribution plate 4 is installed at the opening. The oil distribution plate 4 is a circular plate with holes. The upper part of the oil distribution plate 4 is used to receive the grease from the oil tank. The lower part of the oil distribution plate 4 mainly includes components such as the plunger pair, transmission mechanism, reduction mechanism, and motor. The grease falls from the oil tank onto the oil distribution plate 4 and is squeezed by the rotating seesaw assembly 3. It then moves down to the plunger pair through the holes on the oil distribution plate 4. The plunger pair is driven by the motor, reduction mechanism, and transmission mechanism to draw in and pump the grease out. The friction pair can be lubricated through the pipeline.

[0045] The transmission mechanism mainly refers to the transmission components between the reduction mechanism and the plunger pair, mainly including the output shaft 2, the eccentric wheel mechanism, etc. The output shaft 2 is arranged vertically along the axis of the pump head, and the upper end of the output shaft 2 can extend through the oil distribution plate 4 to the lower part of the oil tank. The seesaw assembly 3 is installed on the upper end of the output shaft 2 and rotates with the rotation of the output shaft 2.

[0046] like Figure 1As shown, the seesaw assembly 3 mainly includes a horizontal shaft that is perpendicularly connected to the output shaft 2 and a seesaw that is rotatably mounted on the horizontal shaft. In this embodiment, two seesaws are arranged side by side. The seesaws have a symmetrical structure with both ends tilted upwards. They can swing up and down around the horizontal shaft. When one side tilts to a certain angle, the other side will contact the oil distribution plate, thereby limiting the tilting angle of the seesaw. The tilting angle of the seesaw is an acute angle.

[0047] like Figure 1 As shown, a magnetic induction sensor 61 is installed at a certain location on the oil distribution plate 4. The magnetic induction sensor 61 is located inside the pump base 1 and below the upper surface of the oil distribution plate 4. In this embodiment, the magnetic induction sensor 61 is a reed switch, and the permanent magnet 625 is a neodymium iron boron magnet. The signal lines of the reed switch are connected to the monitor from the inner cavity of the pump base 11. The monitor is equipped with an alarm circuit. When the reed switch senses the permanent magnet 625, the alarm circuit is activated, and the monitor can display and send a low liquid level alarm signal to the maintenance personnel so that they can replenish the lubricating grease in time.

[0048] like Figure 1 As shown, the stirring rod 5 is rotatably mounted on the output shaft 2. The stirring rod 5 is L-shaped, with the horizontal part mounted on the output shaft 2 and the vertical part set close to the inner wall of the oil tank. This is used to separate the inner wall of the oil tank from the grease inside the tank, so that the grease can fall down by gravity. The oil distribution plate 4 is located below the stirring rod 5 and above the plunger assembly. The oil distribution plate 4 has multiple oil passages evenly distributed on it, which can achieve horizontal and uniform distribution of grease and prevent grease from accumulating in one place.

[0049] like Figure 1-3 As shown, the low liquid level detection mechanism 6 includes a swing assembly and a magnetic induction sensor 61. The swing assembly includes a fixed plate 621 connected to the output shaft 2 and rotating with the output shaft 2. In this embodiment, the fixed plate 621 is part of the horizontal part of the stirring rod 5, and a rotating plate 622 hinged to the outer end of the fixed plate 621 by a hinge shaft 623. The front end of the rotating plate 622 is provided with a permanent magnet 625 extending toward the oil distribution plate 4. The permanent magnet 625 is cylindrical. A rotating shaft 624 is vertically arranged on the rotating plate 622. The permanent magnet 625 is rotatably mounted on the rotating shaft 624. The outer surface of the permanent magnet 625 rolls with the outer side of the guide rail 41. The purpose of this design is to allow the permanent magnet 625 and the guide rail 41 to roll rather than slide, thereby reducing wear when the parts are in contact. When the guide rail 41 guides the rotating plate 622, the grease pusher plate 626 of the rotating plate 622 is also subject to the resistance of the grease, which causes the contact area between the rotating plate 622 and the guide rail 41 to be subjected to greater pressure. If it is sliding friction, the wear will be faster and affect the service life. After changing to rolling friction, the friction is greatly reduced and the wear rate is reduced a lot.

[0050] During its movement, the permanent magnet 625 has first and second limit positions, which are the furthest and closest to the output shaft 2, respectively, with the first limit position corresponding to... Figure 2 The second limit position corresponds to Figure 3 The probe of the magnetic induction sensor 61 is located on the circle centered on the output shaft 2, corresponding to the first limit position of the permanent magnet 625. In other words, the permanent magnet 625 at the first limit position and the magnetic induction sensor 61 are located on the same circle centered on the output shaft 2. The swing assembly is provided with a grease pusher plate 626 for the grease to push its swing. The surface of the grease pusher plate 626 is arranged parallel to the axis of the output shaft 2.

[0051] The guide rail 41 is located on the upper part of the oil distribution plate 4. In this embodiment, the guide rail 41 is part of the oil distribution plate 4 and is integrally machined with the oil distribution plate 4. The guide rail 41 is semi-elliptical, and the center of the ellipse is set close to the axis of the output shaft 2. In this embodiment, the center of the ellipse is concentric with the output shaft 2. The side of the guide rail 41 is used to guide and cooperate with a part of the swing assembly to cause the swing assembly to return from the second limit position to the first limit position. The farthest point 411 on the guide rail 41 from the output shaft 2 is defined as the farthest point 411, and the magnetic induction sensor 61 is set away from the farthest point 411. The cross-section of the guide rail 41 is rectangular. This makes the contact area with the rotating plate 622 larger, improving the load-bearing capacity.

[0052] A seesaw assembly 3 is mounted on the output shaft 2 and rotates with it. When the seesaw assembly 3 rotates, the minimum distance between it and the guide rail 41 is greater than 1mm. The purpose of this arrangement is to bring the guide rail 41 as close to the output shaft 2 as possible while avoiding interference between the guide rail 41 and the seesaw assembly 3, thereby leaving enough space for the installation of the magnetic induction sensor 61 and the swing assembly.

[0053] When the output shaft 2 rotates forward, if there is a lot of grease, the grease pusher plate 626, which rotates with the output shaft 2, will rotate due to the thrust of the grease, causing the permanent magnet 625 to be in the second limit position. The permanent magnet 625 will then be out of the sensing range of the magnetic induction sensor 61. If there is a little grease, the permanent magnet 625, which is in the first limit position after being reset by the guide rail 41, will not be able to switch to the second limit position due to the thrust of the grease applied to the grease pusher plate 626. The magnetic induction sensor 61 can then sense the permanent magnet 625 passing above it to trigger a low liquid level alarm. When the output shaft 2 rotates in reverse, the acquisition of the signal from the magnetic induction sensor 61 will stop.

[0054] To achieve stable detection of low liquid level alarm in the dual-line agitator pump 5, this application utilizes the coordinated operation of components such as the low liquid level alarm assembly, guide rail 41, and control module. Since the motor of the dual-line agitator pump 5 needs to frequently reverse direction, this application only uses the forward rotation of the motor for low liquid level detection. While sensor signals are collected during reverse rotation, they are not used for judgment because the motor quickly switches back to forward rotation after reversing. Detecting low liquid level during forward rotation will not significantly impact the system, thus not delaying low liquid level detection. Under this premise, the scheme of detecting low liquid level only during forward motor rotation can effectively reduce costs and the number of components required for low liquid level detection.

[0055] In actual operation, when the motor rotates forward ( Figure 2 (corresponding to the clockwise direction), the output shaft 2 drives the swing assembly and the stirring rod 5 to rotate. When the swing assembly passes the guide rail 41, it can be slowly guided by the guide rail 41 to return to the first limit position. Subsequently, if there is a lot of grease in the oil tank, the resistance from the grease on the grease pusher plate 626 is greater, causing the permanent magnet 625 to rotate to the second limit position. Figure 3 As shown, when the magnetic induction sensor 61 passes through the permanent magnet 625, it cannot detect it, and therefore there will be no low grease level alarm. When the grease in the tank is low, the force of the grease on the grease pusher plate 626 of the guide rail 41 is small and insufficient to push the permanent magnet 625 to the second limit position. At this time, the permanent magnet 625, which is still in the first limit position or near the first limit position, can be detected by the magnetic induction sensor 61 when it passes through the tank. The feedback is sent to the controller to execute the low grease level alarm, reminding that the amount of grease in the tank is too low. When the motor reverses ( Figure 2 (Counterclockwise direction) Regardless of the amount of grease, although the magnetic induction sensor 61 detects the permanent magnet 625, this information is not processed. On the other hand, the special structure of the guide rail 41 in this application allows the rotating plate 622 to rotate slowly along an arc curve when being guided, and the rotating plate 622 is guided slowly along the same curve in both forward and reverse rotation, avoiding the rotating plate 622 from being subjected to large impacts and aggravating wear, thereby improving the service life of the low liquid level detection mechanism 6.

[0056] An embodiment of the dual-line agitator pump of this utility model: The dual-line agitator pump includes a pump head and an oil tank installed at the opening at the top of the pump head. The structure of the pump head is the same as that in the above embodiments of the pump head, and will not be described again.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. Pump head, including: Pump base; The transmission mechanism includes an output shaft extending upward from the pump base into the oil tank; The stirring rod is rotatably mounted on the output shaft; The oil distribution plate is located below the agitator. Its characteristic is that it further includes: The low liquid level detection mechanism includes a swing assembly and a magnetic induction sensor. The swing assembly includes a fixed plate connected to the output shaft and rotating with the output shaft, and a rotating plate hinged to the outer end of the fixed plate. The front end of the rotating plate is provided with a permanent magnet extending towards the oil distribution plate. During the movement, the permanent magnet has a first and a second limit position, which are the farthest and the closest to the output shaft, respectively. The probe of the magnetic induction sensor is located on a circle centered on the output shaft corresponding to the first limit position of the permanent magnet. The swing assembly is provided with a grease pusher plate for grease to push its swing. The guide rail, located above the oil distribution plate, is semi-elliptical, with the center of the ellipse positioned close to the axis of the output shaft. The side of the guide rail is used to guide and engage with a portion of the swing assembly to cause the swing assembly to return from the second limit position to the first limit position. The farthest point on the guide rail from the output shaft is defined as the farthest point, and the magnetic induction sensor is positioned away from the farthest point. When the output shaft rotates forward, if there is a lot of grease, the grease pusher plate rotating with the output shaft will rotate due to the thrust of the grease, causing the permanent magnet to be in the second limit position, and the permanent magnet will be out of the sensing range of the magnetic induction sensor. If there is a little grease, the permanent magnet in the first limit position after being reset by the guide rail will not be able to switch to the second limit position due to the thrust of the grease applied to the grease pusher plate. The magnetic induction sensor can then detect the permanent magnet passing above it to trigger a low liquid level alarm. When the output shaft rotates in reverse, the acquisition of the magnetic induction sensor signal will stop.

2. The pump head according to claim 1, characterized in that, A seesaw assembly is mounted on the output shaft and rotates with it. The minimum distance between the seesaw assembly and the guide rail when the seesaw assembly rotates is greater than 1mm.

3. The pump head according to claim 1, characterized in that, The permanent magnet is in the shape of a cylindrical tube, and a rotating shaft is vertically arranged on the rotating plate. The permanent magnet is rotatably assembled on the rotating shaft, and the outer surface of the permanent magnet rolls in contact with the outer surface of the guide rail.

4. The pump head according to claim 1, characterized in that, The cross-section of the guide rail is rectangular.

5. The pump head according to claim 1, characterized in that, The magnetic induction sensor is a reed switch.

6. The pump head according to claim 1, characterized in that, The permanent magnet is a neodymium iron boron magnet.

7. The pump head according to claim 1, characterized in that, The surface of the grease-expanding plate is set parallel to the axis of the output shaft.

8. A dual-line agitator pump, characterized in that, It includes the pump head as described in any one of claims 1-7 and the oil tank installed at the upper opening of the pump head.

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