Plunger type lubricating grease pumping device and pump head assembly thereof

Abstract

The utility model relates to a plunger type lubricating grease pumping device and a pump head assembly thereof. The plunger type lubricating grease pumping device comprises a pump head assembly and a lubricating grease storage container, the pump head assembly comprises a pump base, and a transmission mechanism, a plunger pair, an oil guide barrel, an oil pressing assembly, a limiting piece and a guide plate are arranged in an inner cavity of the pump base. The special oil guide barrel is arranged between the lubricating grease storage container and the plunger pair to serve as a direct channel, and the lubricating grease is actively pressurized and conveyed to the grease inlet of the plunger pair through the oil pressing assembly under the guide of the guide plate, so that when the plunger pair sucks the lubricating grease, the lubricating grease with certain pressure can be directly sucked from the grease inlet, and the lubricating grease can be directly sucked into the plunger pair. Due to the fact that pressure lubricating grease is continuously supplied to the grease guide barrel, the grease inlet of the plunger pair cannot be vacuumized, and the problem of plunger evacuation is solved.

Description

Technical Field

[0001] The utility model relates to a plunger type lubricating grease pumping device and a pump head assembly thereof. Background Art

[0002] In the field of grease (commonly known as dry oil) lubrication, a lubrication pump is commonly used to pump the grease to a distribution device for distribution, and then the grease is injected into the friction pair that needs lubrication through an oil pipe. A plunger lubrication pump is a common pumping device. According to the different forms of the oil tank, it is divided into a stirring rod type and a spring piston type. The plunger lubrication pump mainly drives the eccentric mechanism through a motor, and then drives the plunger of at least one plunger pair to move linearly back and forth in the plunger cavity to achieve the suction and pumping of the grease. When the eccentric wheel rotates from the minimum eccentricity to the maximum eccentricity, the plunger is pushed to achieve outward pumping of the grease. When the eccentric wheel rotates from the maximum eccentricity to the minimum eccentricity, the plunger moves toward the eccentric wheel and sucks the grease near the grease inlet of the plunger into the plunger cavity, preparing for the next cycle of outward grease pumping.

[0003] At present, the biggest problem in the use of plunger pumps is the failure of plunger pair pumping out. The pumping out of plunger pair will cause the lubrication pump to lose its normal pumping function, and it needs to be repaired and the bubbles removed before it can be restored to use. Analyzing the reasons for the pumping out of plunger pair, on the one hand, because grease is a viscous semi-fluid with poor fluidity, the bubbles entrained in the grease will not float up and automatically separate from the grease. When these bubbles enter from the grease inlet of the plunger, the plunger will be pumped out, that is, the bubbles cannot transmit power like grease after entering the plunger, and the one-way valve at the outlet of the plunger pair cannot be opened, resulting in the plunger pair being unable to work normally, which is a pumping out failure; on the other hand, due to the limited suction capacity of the plunger pair, and due to the poor fluidity of the grease, it is difficult to transmit vacuum suction, so that the plunger pair can only suck the grease in a small area near the grease inlet. When the grease supply in the area far away from the grease inlet is insufficient, a fault will be formed, causing the plunger pair to be easily pumped out. Utility Model Content

[0004] The utility model aims to provide a plunger type grease pumping device to solve the technical problem of plunger auxiliary evacuation; the utility model also aims to provide a pump head assembly to solve the plunger auxiliary evacuation problem.

[0005] The technical solution of the pump head assembly of the present utility model is as follows: The pump head assembly includes a pump base. The pump base has an inner cavity, in which a transmission mechanism and at least one plunger pair are installed. The plunger pair has a grease inlet. The transmission mechanism includes an output rotating shaft, and the upper end of the output rotating shaft extends outside the inner cavity for inserting into a grease storage container. At least one hollow oil guiding cylinder is installed in the inner cavity. The oil guiding cylinder has an upper opening and a lower opening. The lower opening of the oil guiding cylinder is arranged close to the grease inlet. The upper opening of the oil guiding cylinder faces upward and extends towards the grease storage container. The oil guiding cylinder can guide the grease coming from the grease storage container to the grease inlet of the plunger pair;

[0006] A grease pressing assembly is installed on the upper part of the output rotating shaft. The grease pressing assembly includes a horizontal shaft vertically connected to the output rotating shaft and a movable pressing plate rotatably installed on the horizontal shaft. The movable pressing plate can swing up and down around the horizontal shaft. When the movable pressing plate rotates towards the grease, it can swing upward and tilt under the resistance of the grease;

[0007] The grease pressing assembly further includes a limiting member to limit the maximum upward swing angle of the movable pressing plate;

[0008] The pump head assembly includes a guiding plate arranged corresponding to the upper end of the oil guiding cylinder. The lower side of the guiding plate on the side facing the movable pressing plate is inclined to guide the movable pressing plate to swing downward around the horizontal shaft, so as to squeeze the grease under the movable pressing plate towards the upper opening of the oil guiding cylinder, and drive the grease in the oil guiding cylinder towards the grease inlet of the plunger pair. The lowest point of the guiding plate is located above the upper end opening of the oil guiding cylinder.

[0009] Advantages of this solution: During operation, the drive mechanism within the pump head assembly drives the transmission mechanism to act. The output rotating shaft of the transmission mechanism drives the plunger of the plunger pair to perform reciprocating linear motion, thereby periodically generating a vacuum suction force at the grease inlet. At the same time, since a pressure oil assembly is installed at the upper end of the output rotating shaft, when the output rotating shaft rotates, it drives the cross shaft and the movable pressing plate mounted thereon to rotate. Since the movable pressing plate is filled with grease, when the movable pressing plate rotates with the cross shaft, the oil-facing surface of the movable pressing plate is caused to swing upward around the cross shaft due to the resistance of the grease. However, due to the setting of the limiting member, the movable pressing plate can only maintain the maximum upward swing angle. When the movable pressing plate rotates close to the guide plate, the lower side surface of the guide plate provides a downward force to the movable pressing plate, that is, the guide plate guides the movable pressing plate, causing the movable pressing plate to gradually swing downward. And since the guide plate is arranged close to the oil guide cylinder, the gradually swinging-down movable pressing plate can squeeze the grease downward into the oil guide cylinder, applying pressure to the grease in the oil guide cylinder. The pressurized grease is squeezed towards the grease inlet of the plunger pair and can be sucked by the plunger pair and pumped to the lubrication point. From the above working process, it can be seen that compared with the prior art, the pump head assembly of this application utilizes the original transmission mechanism without the need to additionally increase power. By adding the pressure oil assembly, the oil guide cylinder and the guide plate, it can automatically and actively apply pressure to the grease, especially to the grease flowing towards the grease inlet of the plunger pair, so that the grease is squeezed towards the grease inlet of the plunger pair in a high-pressure state, preventing the vacuum suction force during the suction of the plunger pair from being exhausted. Before the plunger pair sucks, there is already grease filled and accumulated at the grease inlet of the plunger pair, and this part of the grease, due to being compressed, also has a tendency to automatically flow towards the grease inlet of the plunger pair, making it more difficult for the plunger pair to be exhausted.

[0010] Further, the pressure oil assembly includes a fixed pressing plate, and the fixed pressing plate is located on the side of the cross shaft away from the movable pressing plate. The lower surface of the fixed pressing plate is flush with the upper end surface of the oil guide cylinder to reduce the opening size of the upper opening of the oil guide cylinder, thereby increasing the pressure of the grease in the oil guide cylinder.

[0011] Advantages of this solution: Since the movable pressing plate will gradually move away after squeezing the grease into the oil guide cylinder, the upper opening of the oil guide cylinder will be in an open state. Since the pressure transmission of the grease is relatively slow, if the upper opening of the oil guide cylinder is open, the grease just squeezed in the oil guide cylinder will flow out from the upper opening of the oil guide cylinder, that is, a part of the pressure in the oil guide cylinder will be lost. And due to the setting of the fixed pressing plate, when the movable pressing plate squeezes the grease in the oil guide cylinder and leaves, the fixed pressing plate immediately closes the upper opening of the oil guide cylinder for a period of time, enabling the pressure in the oil guide cylinder to have sufficient time to be fully transmitted to the grease inlet, thereby ensuring that it is not easy for the plunger pair to be exhausted during suction.

[0012] Further, the lower surface of the fixed pressing plate is perpendicular to the output rotating shaft.

[0013] Further, the area of the fixed pressing plate is larger than the area of the upper opening of the oil guiding cylinder, so as to ensure that the fixed pressing plate has more time to close the upper opening of the oil guiding cylinder.

[0014] Further, the inner cavity of the oil guiding cylinder is a funnel-shaped structure with a larger upper part and a smaller lower part, which will form an effect of gradually increasing pressure, that is, the inner cavity wall of the oil guiding cylinder can gradually apply pressure to the grease inside it, so that the pressure of the grease near the grease inlet of the plunger pair is greater, thereby improving the effect of sucking the grease.

[0015] Further, the lower end of the oil guiding cylinder is mounted on the plunger pair. At least two grease inlets are arranged circumferentially on the plunger pair. A communication groove communicating with each grease inlet is arranged inside the lower end of the oil guiding cylinder. The lower opening of the oil guiding cylinder communicates with the communication groove, so that the grease flowing down from the lower opening of the oil guiding cylinder can enter each grease inlet through the communication groove. Such a structure can make multiple grease inlets of the plunger pair be wrapped in a relatively closed space, and this space communicates with the lower opening of the oil guiding cylinder, so that the squeezed grease can enter at each grease inlet, that is, the squeezed grease in the oil guiding cylinder can enter from multiple grease inlets of the plunger pair at the same time.

[0016] Further, the guide plate is an inclined flat plate or a V-shaped plate or an arc-shaped plate.

[0017] Further, the limiting member is fixed on the movable pressing plate, and the movable pressing plate is limited by the limiting member and the fixed pressing plate in a blocking and matching manner.

[0018] Further, an oil distribution plate is provided at the upper end of the inner cavity. A plurality of mesh holes are evenly distributed on the oil distribution plate. An avoidance hole is provided on the oil distribution plate for the upper end of the oil guiding cylinder to be inserted. The upper end of the oil guiding cylinder is not higher than the upper surface of the oil distribution plate.

[0019] Further, the plunger pair includes a valve body, a valve core and a return spring. The valve body includes a large-diameter section and a small-diameter section. The return spring is sleeved on the small-diameter section and abuts against the step between the large-diameter section and the small-diameter section. The grease inlet is located on the large-diameter section. Through this structural setting, the gap between the oil guiding cylinder and the plunger pair is smaller, that is, the grease is not easy to flow out from the gap between the oil guiding cylinder and the plunger pair.

[0020] Further, a magnet part is provided on the movable pressing plate, and a magnetic induction sensor is correspondingly provided in the pump base. When the movable pressing plate swings upward to a certain angle, the magnetic induction sensor cannot sense the magnet part, so as to determine whether the grease reaches the low liquid level.

[0021] The technical solution of the plunger-type grease pumping device of the present utility model is as follows: The plunger-type grease pumping device includes a grease storage container and a pump head assembly. The pump head assembly includes a pump base which has an inner cavity. A transmission mechanism and at least one plunger pair are installed in the inner cavity. The plunger pair has a grease inlet. The transmission mechanism includes an output rotating shaft, and the upper end of the output rotating shaft extends outside the inner cavity for extending into the grease storage container. At least one hollow oil guiding cylinder is installed in the inner cavity. The oil guiding cylinder has an upper opening and a lower opening. The lower opening of the oil guiding cylinder is arranged close to the grease inlet. The upper opening of the oil guiding cylinder faces upward and extends towards the grease storage container. The oil guiding cylinder can guide the grease coming from the grease storage container to the grease inlet of the plunger pair;

[0022] A grease pressing assembly is installed on the upper part of the output rotating shaft. The grease pressing assembly includes a horizontal shaft vertically connected to the output rotating shaft and a movable pressing plate rotatably installed on the horizontal shaft. The movable pressing plate can swing up and down around the horizontal shaft. When the movable pressing plate rotates towards the grease, it can swing up and tilt under the resistance of the grease;

[0023] The grease pressing assembly further includes a limiting member to limit the maximum upward swing angle of the movable pressing plate;

[0024] The pump head assembly includes a guiding plate arranged corresponding to the upper end of the oil guiding cylinder. The lower side surface of the side of the guiding plate facing the movable pressing plate is inclined to guide the movable pressing plate to swing downward around the horizontal shaft, so as to squeeze the grease below the movable pressing plate towards the upper opening of the oil guiding cylinder, and drive the grease in the oil guiding cylinder to be squeezed towards the grease inlet of the plunger pair. The lowest point of the guiding plate is located above the upper end opening of the oil guiding cylinder;

[0025] The grease storage container is butted against the upper end of the pump base of the pump head assembly through the opening at the lower part.

[0026] Advantages of this solution: During operation, the drive mechanism within the pump head assembly drives the transmission mechanism to act. The output rotating shaft of the transmission mechanism drives the plunger of the plunger pair to reciprocate linearly, thereby periodically generating a vacuum suction force at the grease inlet. At the same time, since a pressure oil assembly is installed at the upper end of the output rotating shaft, when the output rotating shaft rotates, it drives the cross shaft and the movable pressing plate installed thereon to rotate. Since the movable pressing plate is filled with grease, when the movable pressing plate rotates with the cross shaft, the oil-facing surface of the movable pressing plate is resisted by the grease, causing the movable pressing plate to swing upward around the cross shaft. However, due to the setting of the limiting member, the movable pressing plate can only maintain the maximum upward swing angle. When the movable pressing plate rotates close to the guide plate, the lower side surface of the guide plate provides a downward force to the movable pressing plate, that is, the guide plate guides the movable pressing plate, causing the movable pressing plate to gradually swing downward. Since the guide plate is arranged close to the oil guide cylinder, the gradually swinging-down movable pressing plate can squeeze the grease downward into the oil guide cylinder, applying pressure to the grease in the oil guide cylinder. The pressurized grease is squeezed towards the grease inlet of the plunger pair and can be sucked by the plunger pair and pumped to the lubrication point. From the above working process, it can be seen that compared with the prior art, the pump head assembly of this application utilizes the original transmission mechanism without the need to additionally increase power. By adding the pressure oil assembly, the oil guide cylinder and the guide plate, the grease can be automatically and actively pressurized, especially the grease flowing towards the grease inlet of the plunger pair, so that the grease is squeezed towards the grease inlet of the plunger pair in a high-pressure state, preventing the vacuum suction force during the suction of the plunger pair from being evacuated. Before the plunger pair sucks, the grease inlet of the plunger pair is already filled and accumulated with grease, and this part of the grease has a tendency to automatically flow towards the grease inlet of the plunger pair due to being compressed, making it more difficult for the plunger pair to be evacuated.

[0027] Further, the pressure oil assembly includes a fixed pressing plate, which is located on the side of the cross shaft away from the movable pressing plate. The lower surface of the fixed pressing plate is flush with the upper end surface of the oil guide cylinder to reduce the opening size of the upper opening of the oil guide cylinder, thereby increasing the pressure of the grease in the oil guide cylinder.

[0028] Advantages of this solution: Since the movable pressing plate will gradually move away after squeezing into the oil guide cylinder, the upper opening of the oil guide cylinder will be in an open state. Since the pressure transmission of grease is relatively slow, if the upper opening of the oil guide cylinder is open, the just-squeezed grease in the oil guide cylinder will flow out from the upper opening of the oil guide cylinder, that is, part of the pressure in the oil guide cylinder will be lost. However, due to the setting of the fixed pressing plate, when the movable pressing plate squeezes the grease in the oil guide cylinder and leaves, the fixed pressing plate immediately closes the upper opening of the oil guide cylinder for a period of time, enabling the pressure in the oil guide cylinder to be fully transmitted to the grease inlet for sufficient time, thereby ensuring that it is not easy for the plunger pair to be evacuated during suction.

[0029] Further, the lower surface of the fixed pressing plate is perpendicular to the output rotating shaft.

[0030] Further, the area of the fixed pressing plate is larger than the area of the upper opening of the oil guiding cylinder, so as to ensure that the fixed pressing plate has more time to close the upper opening of the oil guiding cylinder.

[0031] Further, the inner cavity of the oil guiding cylinder is a funnel-shaped structure with a larger upper part and a smaller lower part, which will form an effect of gradually increasing pressure, that is, the inner cavity wall of the oil guiding cylinder can gradually press the grease therein, so that the pressure of the grease near the grease inlet of the plunger pair is greater, thereby improving the effect of sucking the grease.

[0032] Further, the lower end of the oil guiding cylinder is mounted on the plunger pair. At least two grease inlets are arranged on the plunger pair along the circumferential direction. A communication groove communicating with each grease inlet is arranged on the inner side of the lower end of the oil guiding cylinder. The lower opening of the oil guiding cylinder is communicated with the communication groove, so that the grease flowing down from the lower opening of the oil guiding cylinder can enter each grease inlet through the communication groove. Such a structure can make multiple grease inlets of the plunger pair be wrapped in a relatively closed space, and this space is communicated with the lower opening of the oil guiding cylinder, so that the squeezed grease can enter at each grease inlet, that is, the squeezed grease in the oil guiding cylinder can enter from multiple grease inlets of the plunger pair simultaneously.

[0033] Further, the guide plate is an inclined flat plate or a V-shaped plate or an arc-shaped plate.

[0034] Further, the limiting member is fixed on the movable pressing plate, and the movable pressing plate is limited by the limiting member and the fixed pressing plate in a blocking and matching manner.

[0035] Further, an oil distribution disc is provided at the upper end of the inner cavity. A plurality of mesh holes are evenly distributed on the oil distribution disc. An avoidance hole is provided on the oil distribution disc for the upper end of the oil guiding cylinder to be inserted. The upper end of the oil guiding cylinder is not higher than the upper surface of the oil distribution disc.

[0036] Further, the plunger pair includes a valve body, a valve core and a return spring. The valve body includes a large-diameter section and a small-diameter section. The return spring is sleeved on the small-diameter section and abuts against the step between the large-diameter section and the small-diameter section. The grease inlet is located on the large-diameter section. Through this structural arrangement, the gap between the oil guiding cylinder and the plunger pair is smaller, that is, the grease is not easy to flow out from the gap between the oil guiding cylinder and the plunger pair.

[0037] Further, a magnet part is arranged on the movable pressing plate, and a magnetic induction sensor is correspondingly arranged in the pump seat. When the movable pressing plate swings upward to a certain angle, the magnetic induction sensor cannot sense the magnet part, so as to determine whether the grease reaches the low liquid level. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of an embodiment of the pump head assembly of the present utility model;

[0039] Figure 2State diagram when the movable pressure plate is initially in contact with the guide plate;

[0040] Figure 3 Stereogram of the internal structure of the pump head assembly (sectioned along the axial direction of the plunger);

[0041] Figure 4 Stereogram of the internal structure after removing the oil distribution disc;

[0042] Figure 5 Stereogram of the internal structure of the pump head assembly (sectioned along the radial direction of the plunger);

[0043] Figure 6 Stereogram of the core components such as the transmission mechanism, oil pressure component, oil guide cylinder and guide plate Figure 1 ;

[0044] Figure 7 Stereogram of the core components such as the transmission mechanism, oil pressure component, oil guide cylinder and guide plate Figure 2 ;

[0045] Figure 8 State diagram before the movable pressure plate presses oil;

[0046] Figure 9 State diagram after the movable pressure plate presses oil;

[0047] Figure 10 For Figure 9 top view;

[0048] Figure 11 Stereogram of the oil guide cylinder;

[0049] Figure 12 Cross-sectional view of the oil guide cylinder (sectioned along the radial direction of the plunger pair);

[0050] Figure 13 Stereogram of the internal structure of another embodiment of the pump head assembly of the present utility model (sectioned along the axial direction of the plunger);

[0051] In the figure: 1 - pump base, 11 - inner cavity, 12 - transmission mechanism, 121 - output rotating shaft, 122 - eccentric wheel mechanism, 123 - driving motor, 13 - plunger pair, 131 - valve core, 132 - valve body, 1321 - grease inlet, 1322 - large diameter section, 1323 - small diameter section, 133 - return spring, 2 - oil guide cylinder, 21 - upper opening, 22 - lower opening, 23 - communication groove, 3 - oil pressure component, 31 - horizontal shaft, 32 - movable pressure plate, 33 - limiting member, 34 - fixed pressure plate, 4 - guide plate, 5 - oil distribution disc, 51 - mesh hole, 52 - avoidance hole. Detailed implementation manner

[0052] In order to make the objectives, technical solutions and advantages of the present utility model more clearly understood, 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 used to explain the present utility model and are not used to limit the present utility model, that is, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings herein can be arranged and designed in various different configurations.

[0053] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

[0054] It should be noted that relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0055] The features and performance of the present utility model will be further described in detail below with reference to the embodiments.

[0056] An embodiment of the pump head assembly of the present utility model: As Figure 1-12 shown, the pump head assembly is the core component of the lubricating pump. After removing the upper grease storage container (commonly known as the fuel tank) of the lubricating pump, the remaining part is the pump head assembly.

[0057] As Figure 1 、 3, as shown in FIGS. 6, the pump head assembly includes a pump base 1. The pump base 1 has an inner cavity 11. A drive motor 123, a transmission mechanism 12, and a plunger pair 13 are installed in the inner cavity 11. In other embodiments, multiple plunger pairs 13 can also be provided. The multiple plunger pairs 13 can be driven by the same transmission mechanism 12 and an eccentric wheel mechanism 122, and a set of grease guide cylinders 2, guide plates 4, etc. are correspondingly provided. In this embodiment, the transmission mechanism 12 includes a gear transmission mechanism 12, etc. The transmission mechanism 12 further includes an output rotating shaft 121. The upper end of the output rotating shaft 121 extends outside the inner cavity 11 and extends into the grease storage container for a certain distance. At least one hollow grease guide cylinder 2 is installed in the inner cavity 11. The number of grease guide cylinders 2 corresponds to the number of plunger pairs 13 one by one. The grease guide cylinder 2 has an upper opening 21 and a lower opening 22. The plunger pair 13 has at least one grease inlet 1321. In this embodiment, two symmetrical grease inlets 1321 are provided. The lower opening 22 of the grease guide cylinder 2 is arranged close to the grease inlet 1321, that is, the lower opening 22 of the grease guide cylinder 2 is coaxially docked with the grease inlet 1321 of the plunger pair 13 to facilitate receiving and transferring grease. The upper opening 21 of the grease guide cylinder 2 faces upward and extends towards the grease storage container. The grease guide cylinder 2 can guide the grease coming from the grease storage container to the grease inlet 1321 of the plunger pair 13.

[0058] As Figure 3The upper part of the output shaft 121 is provided with an oil pressure assembly 3, which includes a transverse shaft 31 vertically connected to the output shaft 121 and a movable pressure plate 32 rotatably mounted on the transverse shaft 31, and the movable pressure plate 32 can swing up and down around the transverse shaft 31, and when the movable pressure plate 32 rotates toward the grease, it can swing upward under the resistance of the grease; the oil pressure assembly 3 includes a fixed pressure plate 34, which is located on the side of the transverse shaft 31 away from the movable pressure plate 32, and the lower surface of the fixed pressure plate 34 is flush with the upper end surface of the oil guide cylinder 2 so as to reduce the opening size of the upper opening 21 of the oil guide cylinder 2, thereby increasing the pressure of the grease in the oil guide cylinder 2; due to the movable pressure plate 32 guiding the oil guide cylinder 2, the oil guide cylinder 2 is provided with a plurality of movable pressure plates 34, and the plurality of movable pressure plates 34 are ... After being squeezed inside the oil cylinder 2, it will gradually leave, which will cause the upper opening 21 of the oil guide cylinder 2 to be in an open state. Since the grease transmits pressure relatively slowly, if the upper opening 21 of the oil guide cylinder 2 is open, the grease just squeezed inside the oil guide cylinder 2 will flow out from the upper opening 21 of the oil guide cylinder 2, that is, a part of the pressure inside the oil guide cylinder 2 will be lost. Since a fixed pressure plate 34 is provided, when the movable pressure plate 32 squeezes the grease inside the oil guide cylinder 2 and leaves, the fixed pressure plate 34 immediately continues to close the upper opening 21 of the oil guide cylinder 2 for a period of time, so that the pressure inside the oil guide cylinder 2 has enough time to be fully transmitted to the grease inlet 1321, thereby ensuring that the plunger pair 13 is not easily sucked out. The oil pressure assembly 3 also includes a limiter 33 to limit the maximum upward swing angle of the movable pressure plate 32; the limiter 33 is fixed on the movable pressure plate 32, and the limiter 33 cooperates with the fixed pressure plate 34 to limit the movable pressure plate 32. When the movable pressure plate 32 is affected by the grease resistance to swing upward, after reaching the maximum upward swing angle, the lower surface of the limiter 33 fixed to the movable pressure plate 32 contacts the upper surface of the fixed pressure plate 34, so that the movable pressure plate 32 cannot continue to swing upward around the horizontal axis 31, thereby limiting the upward swing angle of the movable pressure plate 32 and preventing the movable pressure plate 32 from swinging upward without limit and being unable to reset.

[0059] like Figure 2 , 3As shown in the figure, the pump head assembly includes a guide plate 4 provided at the upper end of the corresponding grease guide cylinder 2. The lower side surface of the guide plate 4 on the side facing the movable pressure plate 32 is inclined to guide the movable pressure plate 32 to swing downward around the horizontal axis 31, so as to extrude the grease below the movable pressure plate 32 toward the upper opening 21 of the grease guide cylinder 2, and drive the grease in the grease guide cylinder 2 to be extruded toward the grease inlet 1321 of the plunger pair 13. The lowest point of the guide plate 4 is located above the upper end opening of the grease guide cylinder 2. That is, when the oil pressing assembly 3 rotates to the vicinity of the guide plate 4 (also the vicinity of the grease guide cylinder 2) along with the output rotating shaft 121, the upper surface of the side of the movable pressure plate 32 that keeps the maximum upward swing angle and is far from the horizontal axis 31 starts to contact the lower inclined surface of the guide plate 4. Since the guide plate 4 is fixed, the movable pressure plate 32 will gradually swing downward in the reverse direction against the resistance of the grease. That is, under the guidance of the inclined surface on the lower side of the guide plate 4, the movable pressure plate 32 is gradually pressed downward, thereby extruding the grease below the movable pressure plate 32 and making it enter the grease guide cylinder 2, so that the pressure of the grease in the grease guide cylinder 2 gradually increases. In other embodiments, the guide plate 4 can be an inclined flat plate, a V-shaped plate or an arc-shaped plate.

[0060] In addition, the lower surface of the fixed pressure plate 34 is perpendicular to the output rotating shaft 121. The area of the fixed pressure plate 34 is larger than the area of the upper opening 21 of the grease guide cylinder 2, so as to ensure that the fixed pressure plate 34 has more time to close the upper opening 21 of the grease guide cylinder 2. The inner cavity of the grease guide cylinder 2 is a funnel-shaped structure with a larger upper part and a smaller lower part, which will form an effect of gradually increasing pressure, that is, the inner cavity wall of the grease guide cylinder 2 can gradually apply pressure to the grease therein, so that the pressure of the grease near the grease inlet 1321 of the plunger pair 13 is greater, thereby improving the effect of sucking grease.

[0061] As Figure 5 、 11 As shown in FIGS. 12, the lower end of the grease guide cylinder 2 is mounted on the plunger pair 13. At least two grease inlets 1321 are circumferentially arranged on the plunger pair 13. A communication groove 23 communicating with each grease inlet 1321 is arranged on the inner side of the lower end of the grease guide cylinder 2. The lower opening 22 of the grease guide cylinder 2 is communicated with the communication groove 23, so that the grease flowing down from the lower opening 22 of the grease guide cylinder 2 can enter each grease inlet 1321 through the communication groove 23. Such a structure can make multiple grease inlets 1321 of the plunger pair 13 be wrapped in a relatively closed space, and this space is communicated with the lower opening 22 of the grease guide cylinder 2, so that the squeezed grease can enter at each grease inlet 1321, that is, the squeezed grease in the grease guide cylinder 2 can enter from multiple grease inlets 1321 of the plunger pair 13 at the same time.

[0062] As Figure 3 、 5As shown, an oil distribution plate 5 is provided at the upper end of the inner cavity 11 , and a plurality of mesh holes 51 are evenly distributed on the oil distribution plate 5 . An avoidance hole 52 is provided on the oil distribution plate 5 for the upper end of the oil guide cylinder 2 to be inserted, and the upper end of the oil guide cylinder 2 is not higher than the upper surface of the oil distribution plate 5 .

[0063] During operation, the driving mechanism in the pump head assembly drives the transmission mechanism 12 to move, and the output shaft 121 of the transmission mechanism 12 drives the plunger of the plunger pair 13 to reciprocate linearly, so that vacuum suction can be periodically generated at the grease inlet 1321. At the same time, since the oil pressure assembly 3 is installed on the upper end of the output shaft 121, the output shaft 121 drives the horizontal shaft 31 and the movable pressure plate 32 installed thereon to rotate when it rotates. Since the movable pressure plate 32 is full of grease, when the movable pressure plate 32 rotates with the horizontal shaft 31, the oil-facing surface of the movable pressure plate 32 is subjected to the resistance of the grease, causing the movable pressure plate 32 to swing up around the horizontal shaft 31. However, due to the setting of the limiter 33, the movable pressure plate 32 can only maintain the maximum upward swing angle. When the movable pressure plate 32 rotates to approach the guide plate 4, the lower side surface of the guide plate 4 provides a downward force to the movable pressure plate 32, that is, the guide plate 4 guides the movable pressure plate 32, so that the movable pressure plate 32 gradually swings down, and The guide plate 4 is arranged close to the oil guide cylinder 2. The movable pressure plate 32 that gradually swings down can squeeze the grease downward into the oil guide cylinder 2, and apply pressure to the grease in the oil guide cylinder 2. The pressurized grease is squeezed toward the grease inlet 1321 of the plunger pair 13, and can be sucked and pumped to the lubrication point by the plunger pair 13. When the movable pressure plate 32 rotates to leave the upper opening 21 of the oil guide cylinder 2, the fixed pressure plate 34 that follows can cover the upper opening 21 of the oil guide cylinder 2 to ensure that the grease in the oil guide cylinder 2 will not be depressurized immediately, but maintain the pressure for a period of time, to ensure that the slowly flowing grease has enough time to transmit the pressure to the grease inlet 1321 of the plunger pair 13, to ensure that there is no vacuum problem at the grease inlet 1321; the movable pressure plate 32 that leaves the oil guide cylinder 2 is no longer restricted and guided by the guide plate 4. Under the resistance of the oncoming grease in front, the movable pressure plate 32 swings up again to restore to the maximum upward swing angle. It can be seen from the above working process that, compared with the prior art, the pump head assembly of the present application utilizes the original transmission mechanism 12, and there is no need to add additional power. By adding the settings of the oil pressure assembly 3, the oil guide cylinder 2 and the guide plate 4, pressure can be automatically and actively applied to the grease, especially pressure is applied to the grease flowing to the grease inlet 1321 of the plunger pair 13, so that the grease is squeezed to the grease inlet 1321 of the plunger pair 13 under a higher pressure state, so that the vacuum suction force of the plunger pair 13 will not be emptied during suction. Before the plunger pair 13 is sucked, grease is already fully accumulated at the grease inlet 1321 of the plunger pair 13, and this part of the grease has a tendency to automatically flow to the grease inlet 1321 of the plunger pair 13 due to compression, making the plunger pair 13 more difficult to be emptied.

[0064] In other embodiments, a magnet part can be provided on the movable platen 32, and a magnetic induction sensor can be provided in the pump base 1 accordingly, for example, a magnetic induction sensor can be provided at a certain position on the oil distribution plate 5. When there is more grease in the grease storage container, the resistance on the movable platen 32 is large enough, so that the movable platen 32 swings upward to a certain angle, and the magnetic induction sensor cannot sense the magnet part. When the grease in the grease storage container is reduced to a certain extent, the resistance provided by the grease to the movable platen 32 is not enough to make the movable platen 32 tilt up, and the magnet part on the movable platen 32 can be sensed by the magnetic induction sensor, so as to determine whether the grease has reached a low liquid level. The shape of the oil guide cylinder can also be replaced by a pipe shape with openings at both ends, such as a square cylinder, a cylindrical cylinder, a polygonal cylinder, a special-shaped cylinder, etc.

[0065] Another embodiment of the pump head assembly of the utility model: the plunger pair 13 includes a valve body 132, a valve core 131 and a reset spring 133. The difference from the previous embodiment is that the valve body 132 includes a large diameter section 1322 and a small diameter section 1323. The reset spring 133 is sleeved on the small diameter section 1323 and abuts against the step between the large diameter section 1322 and the small diameter section 1323. The grease inlet 1321 is located on the large diameter section 1322. Through this structural setting, the reset spring 133 will not block the grease inlet 1321, so that the gap between the oil guide cylinder 2 and the plunger pair 13 can be set smaller, that is, the grease is not easy to flow out from the gap between the oil guide cylinder 2 and the plunger pair 13, thereby improving the suction effect of the plunger pair 13.

[0066] An embodiment of the plunger-type grease pumping device of the utility model comprises a grease storage container and a pump head assembly. The grease storage container is connected to the upper end of the pump seat of the pump head assembly through an opening at the bottom. The structure of the pump head assembly is the same as that of the above-mentioned embodiments of the pump head assembly and will not be repeated here.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pump head assembly, comprising a pump seat, the pump seat having an inner cavity, a transmission mechanism and at least one plunger pair installed in the inner cavity, the plunger pair having a grease inlet, the transmission mechanism comprising an output shaft, the upper end of the output shaft extending out of the inner cavity for extending into a grease storage container, characterized in that: At least one hollow oil guide cylinder is installed in the inner cavity, and the oil guide cylinder has an upper opening and a lower opening. The lower opening of the oil guide cylinder is arranged close to the grease inlet, and the upper opening of the oil guide cylinder is arranged upward and extends toward the grease storage container. The oil guide cylinder can guide the grease from the grease storage container to the grease inlet of the plunger pair; An oil pressing assembly is installed on the upper part of the output shaft, and the oil pressing assembly includes a horizontal shaft vertically connected to the output shaft and a movable pressing plate rotatably installed on the horizontal shaft. The movable pressing plate can swing up and down around the horizontal shaft. When the movable pressing plate rotates toward the grease, it can swing upward under the resistance of the grease. The oil pressing assembly also includes a limiter to limit the maximum upward swing angle of the movable pressing plate; The pump head assembly includes a guide plate arranged at the upper end of the oil guide cylinder. The guide plate is inclined on the lower side surface facing the movable pressure plate to guide the movable pressure plate to swing downward around the horizontal axis, so as to squeeze the grease under the movable pressure plate toward the upper opening of the oil guide cylinder, and drive the grease in the oil guide cylinder to be squeezed toward the grease inlet of the plunger pair. The lowest point of the guide plate is located above the upper end opening of the oil guide cylinder.

2. The pump head assembly according to claim 1, characterized in that: The oil pressure assembly includes a fixed pressure plate, which is located on the side of the horizontal axis away from the movable pressure plate. The lower surface of the fixed pressure plate is flush with the upper end surface of the oil guide cylinder to reduce the opening size of the upper opening of the oil guide cylinder, thereby increasing the pressure of the grease in the oil guide cylinder.

3. The pump head assembly according to claim 2, characterized in that: The lower surface of the fixed pressing plate is arranged perpendicularly to the output rotating shaft.

4. The pump head assembly according to claim 3, characterized in that: The area of ​​the fixed pressure plate is larger than the area of ​​the upper opening of the oil guide cylinder.

5. The pump head assembly according to claim 1, characterized in that: The inner cavity of the oil guide cylinder is a funnel-shaped structure that is larger at the top and smaller at the bottom.

6. The pump head assembly according to claim 1, characterized in that: The lower end of the oil guide cylinder is mounted on the plunger pair, and at least two grease inlets are circumferentially arranged on the plunger pair. A connecting groove connecting the grease inlets is arranged on the inner side of the lower end of the oil guide cylinder, and the lower opening of the oil guide cylinder is connected to the connecting groove, so that the grease flowing down from the lower opening of the oil guide cylinder can enter the various grease inlets through the connecting groove.

7. The pump head assembly according to claim 1, characterized in that: The guide plate is a flat plate, a V-shaped plate or an arc-shaped plate which is arranged obliquely.

8. The pump head assembly according to claim 2, characterized in that: The limiting member is fixed on the movable pressing plate, and the limiting member cooperates with the fixed pressing plate to limit the movable pressing plate.

9. The pump head assembly according to claim 1, characterized in that: An oil distribution plate is arranged at the upper end of the inner cavity, and a plurality of mesh holes are evenly distributed on the oil distribution plate. An avoidance hole is arranged on the oil distribution plate for inserting the upper end of the oil guide cylinder, and the upper end of the oil guide cylinder is not higher than the upper surface of the oil distribution plate.

10. The pump head assembly according to claim 1, characterized in that: The plunger pair includes a valve body, a valve core and a return spring. The valve body includes a large diameter section and a small diameter section. The return spring is sleeved on the small diameter section and abuts against the step between the large diameter section and the small diameter section. The grease inlet is located on the large diameter section.

11. The pump head assembly according to claim 1, characterized in that: The movable pressure plate is provided with a magnet part, and the pump seat is correspondingly provided with a magnetic induction sensor. When the movable pressure plate is swung upward to a certain angle, the magnetic induction sensor cannot sense the magnet part, so as to determine whether the grease reaches a low liquid level.

12. A plunger type grease pumping device, comprising a grease storage container, characterized in that: It also includes a pump head assembly as described in any one of claims 1 to 11, and the grease storage container is connected to the upper end of the pump seat of the pump head assembly through the opening at the bottom.

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