Hand-held hydraulic tool pump body structure

Abstract

The utility model discloses a handheld hydraulic tool pump body structure, and belongs to the technical field of handheld electric hydraulic tools. Comprising a pump body, a driving motor and a hydraulic oil tank, the driving motor and the hydraulic oil tank are arranged on the outer side of the pump body, a reduction gear set is arranged on one side in the pump body, the driving motor is connected with and drives the reduction gear set, the reduction gear set drives an eccentric wheel, and the pressure pumping pump body is driven through the eccentric wheel and a pressure pumping plunger. According to the utility model, the limitation of appearance design is broken through, the requirements of construction working conditions can be met to the greatest extent, the pressure pumping pump body is arranged on the inner side of the pump body, the integrated design is realized, the structure is more compact, the constant pressure design is adopted, the constant output of hydraulic pressure in each operation is ensured, and tool damage and personnel injury caused by overpressure are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of handheld electric hydraulic tool equipment, in particular to a handheld hydraulic tool pump body structure. Background Art

[0002] Electric hydraulic tools include electric hydraulic crimping pliers, electric hydraulic shearing and expanding pliers, electric hydraulic crimping pliers, etc. Electric hydraulic tools are generally composed of motors, oil storage chambers, hydraulic pumps, hydraulic cylinders, switch components, control valves and other parts. When the electric hydraulic tool is working, the motor drives the hydraulic pump to rotate, pressurizes the pressure oil in the oil storage chamber into the hydraulic cylinder and pushes the hydraulic working end to keep it in working state. When the hydraulic working end needs to stop working, the switch component is closed to stop the motor, and then the oil drain hole is opened. At this time, under the action of the reset spring, the pressure oil is returned to the oil storage chamber.

[0003] However, the existing hydraulic structure is relatively large and heavy. Due to the size and weight, the operating experience is not good, especially for small spaces, there are great limitations. Traditional PPR pipes are gradually replaced by metal pipes. The connection between thin-walled stainless steel pipes and copper pipes usually uses hydraulic tools to squeeze and deform the pipes to achieve a sealing effect. Among the existing technical solutions, handheld hydraulic tools are already relatively popular, but due to the size of the internal hydraulic system, the overall shape and weight of the existing handheld hydraulic tools are generally large. When high-altitude operations and operations in small spaces are required, especially for the connection of pipeline systems, the existing handheld hydraulic tools are insufficient in ease of use.

[0004] To this end, the applicant has conducted useful explorations and attempts and found solutions to the above problems. The technical solutions to be introduced below were produced in this context. Summary of the invention

[0005] The utility model mainly solves the technical problems existing in the above-mentioned prior art and provides a handheld hydraulic tool pump body structure.

[0006] The above technical problems of the utility model are mainly solved by the following technical solutions: a handheld hydraulic tool pump body structure, including a pump body and a driving motor and a hydraulic oil tank arranged outside the pump body, a reduction gear set is arranged on one side of the pump body, the driving motor is connected to drive the reduction gear set, an eccentric wheel is arranged on the inner side of the pump body and on the other side of the reduction gear set, a transmission shaft is arranged on the reduction gear set, the transmission shaft eccentrically penetrates and is arranged on the eccentric wheel, the transmission shaft is arranged on the inner side of the pump body and on the eccentric wheel A pumping plunger is connected to the outside of the pump body, an inner oil chamber is provided in the pump body and is located on the other side of the pumping plunger, the hydraulic oil tank is communicated with the inner oil chamber, a pumping pump body is installed in the inner oil chamber, a pumping hole adapted to the pumping plunger is provided in the pumping pump body, an oil inlet channel and an oil outlet channel are provided in the pumping pump body and on the other side of the pumping hole, an inner oil delivery channel is correspondingly provided in the pumping pump body in the direction of the oil outlet, a hydraulic pipe is also connected to the outside of the pump body, and the inner oil delivery channel is communicated with the hydraulic pipe;

[0007] Wherein, a pressure relief channel is opened at the inner oil delivery channel, the other end of the pressure relief channel is communicated with the inner oil cavity, and a pressure relief mechanism is arranged on the pressure relief channel.

[0008] Preferably, a check valve is provided in the oil inlet passage.

[0009] Preferably, a mechanical seal is provided on the transmission shaft between the eccentric wheel and the reduction gear set.

[0010] Preferably, the pressure relief mechanism comprises a pressure relief hole formed on the side wall of the pump body and a pressure relief pin arranged on the inner side of the pressure relief hole; an oil outlet is arranged at the center of the pressure relief hole; one end of the pressure relief channel away from the inner oil delivery channel is connected to the oil outlet; an oil inlet hole is arranged on the side wall of the pressure relief hole; the other end of the oil inlet hole is communicated with the inner oil chamber; a needle head portion of the pressure relief pin applies force to the oil outlet; a closing cover is arranged at the orifice of the pressure relief hole; a pin pressure spring is arranged between the closing cover and the needle head portion of the pressure relief pin; the pin pressure spring presses the pressure relief pin toward the oil outlet.

[0011] Preferably, the tail end of the pressure relief ejector pin passes through the other side of the closing cover, and the tail end of the pressure relief ejector pin is connected to a pressure relief pry plate.

[0012] Preferably, a sunken installation cavity is provided on the side of the pump body located on one side of the inner oil chamber, an oil passage is provided on one side of the installation cavity, the oil passage is connected to the inner oil chamber, the oil inlet hole is connected to the oil passage, and the outer side of the installation cavity is sealed with a cover plate.

[0013] The utility model has the beneficial effects:

[0014] 1. The utility model adopts a split hydraulic oil tank, breaking through the limitations of the appearance design and meeting the construction working conditions to the greatest extent;

[0015] 2. The pump body of the utility model is located inside the pump body, which realizes an integrated design and a more compact structure;

[0016] 3. The utility model adopts a constant pressure design to ensure a constant output of hydraulic pressure for each operation, avoiding tool damage and personal injury caused by overpressure. This structure further improves the reliability of hydraulic tools and the comfort and convenience of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a three-dimensional side view structural schematic diagram of the pump body of the utility model;

[0019] Figure 3 This is a schematic diagram of the bottom structure of the pump body of the utility model;

[0020] Figure 4 yes Figure 3 A schematic diagram of a cross-sectional view in the A direction;

[0021] Figure 5 yes Figure 4 An enlarged schematic diagram of a structure in the middle C section;

[0022] Figure 6 yes Figure 3 A schematic diagram of a cross-sectional view in the B direction;

[0023] Figure 7 This is a structural schematic diagram of the installation cavity of the utility model;

[0024] Figure 8 This is a structural schematic diagram of the pressure relief hole of the utility model;

[0025] Fig. 9 This is a structural schematic diagram of the pressure relief ejector pin of the utility model; DETAILED DESCRIPTION

[0026] The following are examples and the attached Figure 1-Figure 9 The structure is shown in the figure, and the technical solution of the utility model is further specifically described.

[0027] Embodiment 1: A handheld hydraulic tool pump body structure comprises a pump body 1 and a driving motor 2 and a hydraulic oil tank 3 arranged on the outside of the pump body 1, wherein a reduction gear set 101 is arranged on one side of the pump body 1, the driving motor 2 is connected to drive the reduction gear set 101, and an eccentric wheel 102 is arranged on the inner side of the pump body 1 and on the other side of the reduction gear set 101, a transmission shaft 103 is arranged on the reduction gear set 101, and the transmission shaft 103 is eccentrically penetrated on the eccentric wheel 102, and a pumping plunger 104 is connected to the inner side of the pump body 1 and on the outer side of the eccentric wheel 102, and an inner oil chamber 103 is arranged on the other side of the pumping plunger 104 and in the pump body 1. 05, the hydraulic oil tank 3 is communicated with the inner oil chamber 105, a pumping pump body 106 is installed in the inner oil chamber 105, a pumping channel 107 adapted to the pumping plunger 104 is provided in the pumping pump body 106, an oil inlet channel 108 and an oil outlet channel 109 are provided in the pumping pump body 106 and on the other side of the pumping channel 107, the channel is unidirectional, that is, the hydraulic oil can only flow from the inner oil chamber 105 to 108, and from the oil outlet channel 109 to 110, an inner oil delivery channel 110 is correspondingly provided in the pumping pump body 106 in the direction of the oil outlet channel 109, and a hydraulic pipe 4 is also connected to the outside of the pump body 1, and the inner oil delivery channel 110 is communicated with the hydraulic pipe 4;

[0028] A pressure relief hole 111 is provided at the inner oil delivery channel 110 , the other end of the pressure relief hole 111 is communicated with the inner oil chamber 105 , and a pressure relief mechanism is provided on the pressure relief hole 111 .

[0029] The specific implementation method is:

[0030] The driving motor 2 drives the transmission shaft 103 to rotate, the transmission shaft 103 drives the eccentric wheel 102 to rotate, the eccentric wheel 102 drives the pumping plunger 104 to reciprocate, and the reciprocating motion of the pumping plunger 104 causes the hydraulic oil to enter the booster chamber 107. Since the oil inlet channel 108 and the oil outlet channel 109 are one-way channels, the reciprocating motion of the plunger 104 can continuously output the hydraulic oil to form a high pressure. After passing through the oil outlet channel 109, the hydraulic oil is input into the hydraulic pipe 4, and one end of the hydraulic pipe 4 is connected to the existing hydraulic cylinder 6 and the hydraulic device 7;

[0031] During pressure relief, when the pressure in the hydraulic pipe 4 reaches a certain value, the pressure relief mechanism is opened by the pressure, causing the hydraulic oil to flow to the pressure relief channel 111 and then flow back to the inner oil chamber 105 through the pressure relief channel 111;

[0032] By using aviation aluminum as the main body of the pump, it can be made lightweight and easy to hold.

[0033] Embodiment 2:

[0034] This embodiment is further limited on the basis of Embodiment 1 in that a check valve is provided in the oil inlet passage 108 .

[0035] The check valve prevents the hydraulic oil from flowing back during pumping.

[0036] The other parts of this embodiment are the same as those of the above-mentioned embodiment 1 and will not be described in detail.

[0037] Embodiment 3:

[0038] Based on Example 1, this embodiment further defines that a mechanical seal 112 is provided on the transmission shaft 103 between the eccentric wheel 102 and the reduction gear set 101 .

[0039] The mechanical seal 112 prevents the hydraulic oil from leaking to the reduction gear set 101 and causing oil leakage.

[0040] The other parts of this embodiment are the same as those of the above-mentioned embodiment 1 and will not be described in detail.

[0041] Embodiment 4:

[0042] The present embodiment further defines, on the basis of any one of the embodiments 1 to 3, that the pressure relief mechanism comprises a pressure relief hole 115 provided on the side wall of the pump body 1 and a pressure relief pin 118 arranged on the inner side of the pressure relief hole 115; an oil outlet 116 is arranged at the center of the pressure relief hole 115; one end of the pressure relief channel 111 away from the inner oil delivery channel 110 is connected to the oil outlet 116; an oil inlet hole 117 is provided on the side wall of the pressure relief hole 115; the other end of the oil inlet hole 117 is communicated with the inner oil chamber 105; a needle head portion of the pressure relief pin 118 applies force to the oil outlet 116; a closing cover 119 is provided at the orifice of the pressure relief hole 115; a pin pressure spring 120 is provided between the closing cover 119 and the needle head portion of the pressure relief pin 118; the pin pressure spring 120 presses the pressure relief pin 118 toward the oil outlet 116.

[0043] The pressure relief ejector pin 118 is pressurized by the ejector pin pressure spring 120 so that the pressure relief ejector pin 118 is always pressed against the oil outlet 116 under a certain pressure. When the pressure in the pressure relief channel 111 reaches the pressure relief value, the pressure relief ejector pin 118 is pushed open, so that the hydraulic oil is relieved to the pressure relief hole 115 and flows back to the inner oil chamber 105 through the oil inlet hole 117 to realize circulation.

[0044] The other parts of this embodiment are the same as any of the above embodiments 1 to 3 and will not be repeated here.

[0045] Embodiment 5:

[0046] On the basis of Embodiment 4, this embodiment further defines that the tail end of the pressure relief pin 118 passes through the other side of the closing cover 119 , and the tail end of the pressure relief pin 118 is connected to a pressure relief pry plate 121 .

[0047] By pressing the pressure relief pry plate 121 , the pressure relief pry plate 121 pries up the pressure relief ejector pin 118 , thereby achieving the purpose of manual pressure relief and improving practicality.

[0048] The other parts of this embodiment are the same as those of the above-mentioned embodiment 4 and will not be described in detail.

[0049] Embodiment 6:

[0050] Based on Example 4, this embodiment further defines that a sunken installation cavity 113 is provided on the side of the pump body 1 located on one side of the inner oil chamber 105, and an oil passage 114 is provided on one side of the installation cavity 113. The oil passage 114 is connected to the inner oil chamber 105, and the oil inlet hole 117 is connected to the oil passage 114. The outer side of the installation cavity 113 is covered with a cover plate 5.

[0051] The installation cavity 113 facilitates the installation of the suction and pressure pump body 106 , and allows the depressurized hydraulic oil to flow back to the inner oil cavity 105 through the oil passage 114 .

[0052] The other parts of this embodiment are the same as those of the above-mentioned embodiment 4 and will not be described in detail.

[0053] The design principle of this utility model:

[0054] Through the integrated design in the pump body 1, a mini pump body can be obtained. The hydraulic oil is discharged to the front hydraulic cylinder 6 through the hydraulic pipe 4. The hydraulic cylinder 6 is provided with a piston and a piston rod. There is a roller in front of the piston rod. When the pump body is working, the piston moves forward to push the roller. Different molds (hydraulic equipment 7) can be matched in front of the roller for operation.

[0055] The pump body 1 of this design adopts an integrated design. The reducer (reduction gear set 101) and eccentric wheel, plunger (pressure pumping plunger 104), and pressure regulating valve (pressure relief mechanism) are all integrated on an entire valve block. The reducer converts the high speed output by the motor into low-speed and high-torque, driving the eccentric wheel to perform radial reciprocating motion, thereby driving the plunger to perform reciprocating motion to achieve the process of oil suction and oil discharge. A pressure relief mechanism is provided in the output oil circuit, and a spring is used to press the valve needle onto the valve seat. When the system pressure is greater than the force of the spring, the valve needle will be opened to achieve pressure release.

[0056] Finally, it should be pointed out that the above embodiments are only representative examples of the present utility model. Obviously, the present utility model is not limited to the above embodiments, and there are many variations. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present utility model should be considered to belong to the protection scope of the present utility model.

Claims

1. A handheld hydraulic tool pump structure, comprising a pump body (1), a drive motor (2) and a hydraulic oil tank (3) arranged outside the pump body (1), characterized in that A reduction gear set (101) is provided on one side of the pump body (1); the drive motor (2) is connected to the drive reduction gear set (101); an eccentric wheel (102) is provided on the inner side of the pump body (1) and on the other side of the reduction gear set (101); a transmission shaft (103) is provided on the reduction gear set (101); the transmission shaft (103) is eccentrically penetrated on the eccentric wheel (102); a pumping plunger (104) is connected to the inner side of the pump body (1) and on the outer side of the eccentric wheel (102); an inner oil chamber (105) is provided on the other side of the pumping plunger (104) and in the pump body (1); The hydraulic oil tank (3) is connected to the inner oil chamber (105), a pumping pump body (106) is installed in the inner oil chamber (105), a pumping hole (107) adapted to the pumping plunger (104) is provided in the pumping pump body (106), an oil inlet channel (108) and an oil outlet channel (109) are provided in the pumping pump body (106) and on the other side of the pumping hole (107), an inner oil delivery channel (110) is provided in the pumping pump body (106) in the direction of the oil outlet channel (109), and a hydraulic pipe (4) is connected to the outer side of the pump body (1), and the inner oil delivery channel (110) is connected to the hydraulic pipe (4); A pressure relief hole (111) is provided at the inner oil delivery channel (110), the other end of the pressure relief hole (111) is communicated with the inner oil chamber (105), and a pressure relief mechanism is provided on the pressure relief hole (111).

2. The handheld hydraulic tool pump body structure according to claim 1 is characterized in that A check valve is arranged in the oil inlet passage (108).

3. The handheld hydraulic tool pump body structure according to claim 1 is characterized in that A mechanical seal (112) is provided on the transmission shaft (103) between the eccentric wheel (102) and the reduction gear set (101).

4. The handheld hydraulic tool pump body structure according to any one of claims 1 to 3, characterized in that The pressure relief mechanism comprises a pressure relief hole (115) formed on the side wall of the pump body (1) and a pressure relief ejector pin (118) arranged inside the pressure relief hole (115); an oil outlet (116) is arranged at the center of the pressure relief hole (115); an end of the pressure relief channel (111) away from the internal oil delivery channel (110) is connected to the oil outlet (116); an oil inlet hole (117) is arranged on the side wall of the pressure relief hole (115); and the oil inlet hole (117) is provided on the side wall of the pressure relief hole (115). The other end of the pressure relief pin (17) is connected to the inner oil chamber (105), the needle head portion of the pressure relief pin (118) applies force to the oil outlet (116), a closing cover (119) is provided at the opening of the pressure relief hole (115), a pin pressure spring (120) is provided between the closing cover (119) and the needle head portion of the pressure relief pin (118), and the pin pressure spring (120) applies pressure to the pressure relief pin (118) toward the oil outlet (116).

5. The handheld hydraulic tool pump body structure according to claim 4 is characterized in that The tail end of the pressure relief ejector pin (118) passes through the other side of the closing cover (119), and the tail end of the pressure relief ejector pin (118) is connected to a pressure relief pry plate (121).

6. The handheld hydraulic tool pump body structure according to claim 4, characterized in that A sunken installation cavity opening (113) is provided on the side surface of the pump body (1) located on one side of the inner oil cavity (105); an oil passage (114) is provided on one side of the installation cavity opening (113); the oil passage (114) is communicated with the inner oil cavity (105); the oil introduction hole (117) is communicated with the oil passage (114); and a cover plate (5) is provided on the outer side of the installation cavity opening (113).

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