A dual-speed hydraulic hand pump

Abstract

The present invention relates to the technical field of hydraulic manual pumps, and specifically to a dual-speed hydraulic manual pump, comprising a pump body, a plug rod movable up and down is arranged on the top of the pump body, a pressure rod is hingedly installed on the top of the plug rod, a reciprocating mechanism is penetrated through the top of the liquid storage shell by a sealing ring, two filtering mechanisms are symmetrically arranged on one side of the pump body close to the liquid inlet, and a constant direction mechanism is slidingly arranged on the outer side of the connecting rod; the present invention adopts the design of the reciprocating mechanism and the filtering mechanism, so that when the pressure rod reciprocates up and down, it can drive the second filter screen to rotate continuously through the toothed ring, so that the second filter screen in a rotating state can dynamically filter the hydraulic oil entering the inner side of the pump body, and the rotation of the toothed ring can continuously drive the exhaust fan to rotate, so that the second filter screen can always be in a dynamic filtering state of cleanness and impurity-free, thereby improving the filtering effect.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic hand pumps, in particular to a dual-speed hydraulic hand pump. Background Art

[0002] The two-speed hydraulic hand pump is a hydraulic power source commonly used in engineering machinery, agricultural machinery, industrial equipment and other fields. It provides hydraulic oil through manual operation to drive the hydraulic system. Compared with a single-speed hydraulic pump, the two-speed hydraulic hand pump has two different displacement settings, allowing users to select the appropriate output pressure and flow according to work requirements. There are two plungers in the pump body of the two-speed manual pump. When the pressure is low, the two plungers supply oil to the system at the same time. At this time, the displacement is the largest, which is used to increase the movement speed of the load at low pressure; when the load pressure reaches the pressure of the low-pressure control valve, only the high-pressure plunger supplies oil.

[0003] A Chinese patent with announcement number CN105986983B discloses an ultra-high pressure hydraulic manual pump, including a pump body. The present invention can achieve a maximum working pressure of more than 350 MPa for the manual pump. At the same time, the equipment structure is not very complicated compared to a traditional manual hydraulic pump and has better sealing performance.

[0004] The Chinese patent with announcement number CN114718831B discloses a high-pressure manual pump that can be used in a closed hydraulic system. In order to make the hand pump transmission reliable under high-pressure load conditions, the present invention adopts a new swash plate structure design. When the load pressure is large, it can still ensure the reliable force transmission state between the plunger and the swash plate, improve the force state of the plunger, reduce the lateral overturning force of the plunger, avoid lateral overturning of the plunger, and reduce wear.

[0005] When the hydraulic pump is performing hydraulic work, the cleanliness of the hydraulic oil has a vital impact on the stable operation of the system and the life of the components. Traditional hydraulic pumps often do not filter the hydraulic oil when working, so that the solid particles contained in the hydraulic oil will flow with the oil in the system and deposit inside the hydraulic components such as hydraulic pumps, hydraulic cylinders, and valves. These particles will cause the internal channels of the components to be blocked, increase friction, accelerate component wear, and reduce the overall working efficiency of the system. Cavitation will also occur in the hydraulic system, causing an increase in system noise. Some filters are also used to filter the hydraulic oil. Usually, static filters are also prone to accumulation and blockage of impurity particles during use, reducing the stability of the hydraulic system.

[0006] Therefore, the present invention provides a dual-speed hydraulic manual pump capable of dynamically filtering the hydraulic oil that can enter the inner side of the pump body. Summary of the invention

[0007] Aiming at the problems that the static filter in the prior art has poor filtering effect and is prone to clogging and failure, a dual-speed hydraulic manual pump is designed.

[0008] The technical solution adopted by the present invention to solve its technical problems is: a dual-speed hydraulic manual pump, including a pump body, a plug rod movable up and down is arranged on the top of the pump body, a pressure rod is hingedly installed on the top of the plug rod, a liquid inlet is arranged on one side of the pump body, a C-shaped through pipe is arranged on the outside of the pump body, a liquid storage shell is arranged on the side of the pump body close to the liquid inlet, and the liquid storage shell is communicated with the C-shaped through pipe, a reciprocating mechanism is arranged on the top of the liquid storage shell through a sealing ring, the reciprocating mechanism includes a reciprocating rod, two racks 1 are arranged on the side of the reciprocating rod close to the pump body through a connecting plate, a plurality of connecting rods are fixedly installed between the two racks 1, two filtering mechanisms are symmetrically arranged on the side of the pump body close to the liquid inlet, the filtering mechanism includes a toothed ring, a filter screen 2 is fixedly installed on the inner side of the toothed ring, the The inner transmission of the toothed ring is provided with a discharge fan, and the outer sliding side of the connecting rod is provided with a constant direction mechanism, the constant direction mechanism includes a movable plate slidably arranged on the outer side of the connecting rod, a limit rod is arranged on the side of the movable plate close to the pump body, and two guide grooves are provided on the side of the pump body close to the liquid inlet, and two circulation fans are installed inside the C-shaped through-tube through the rotation of the rotating shaft; the reciprocating mechanism is assembled to drive the rack 1 to reciprocate up and down through the reciprocating rod; the filtering mechanism is assembled to filter the liquid that is about to enter the liquid inlet through the filter screen 2, and use the reciprocating motion of the rack 1 to drive the discharge fan to rotate, so as to clean the impurities on the surface of the filter screen 2; the constant direction mechanism is assembled to achieve that the rotating shaft drives the circulation fan to rotate in only one direction through the cooperation of the limit rod and the guide groove and the reciprocating motion of the rack 1.

[0009] Furthermore, a liquid outlet connected to the interior is provided on one side of the pump body, and the liquid outlet is surrounded by a C-shaped through pipe, a filter screen is fixedly installed on the inner side of the C-shaped through pipe, a side rod is fixedly installed on the side of the plug rod close to the liquid inlet, and the side rod passes through the interior of the pressure rod, and a liquid inlet valve is installed on one side of the liquid storage shell.

[0010] Furthermore, a contact end is fixedly installed on the top of the reciprocating rod, and the contact end is located at the bottom of the side rod, a thick spring is fixedly installed on the top of the liquid storage shell, the thick spring is located on the outside of the reciprocating rod, and one end of the thick spring is fixedly connected to the bottom of the contact end, the part of the reciprocating rod located on the inner side of the liquid storage shell is a semi-cylindrical shape, and the plane of the semi-cylindrical shape faces the pump body, and the rack is fixedly installed on the flat part through a connecting plate.

[0011] Furthermore, the filtering mechanism corresponds to the liquid inlet one by one, and the filtering mechanism also includes a fixing ring, which is fixedly installed on one side of the pump body, and the fixing ring is located on the outer side of the liquid inlet, and the toothed ring is rotatably installed on the inner side of the fixing ring through a bearing, and a toothed ring is provided with a ring-shaped toothed groove on the inner side of the toothed ring close to the pump body, and a gear 1 is rotatably installed on one side of the pump body through a bearing and a rotating rod, and the gear 1 is located between the liquid inlet and the toothed ring, and a toothed column is rotatably installed on one side of the pump body through a bearing, and the toothed column is located between the liquid inlet and the gear 1, and a toothed groove is provided on the surface of the toothed column, and the gear 1 is meshed with the toothed grooves of the toothed ring and the toothed grooves of the toothed column at the same time, and the discharge fan is fixedly connected to one end of the toothed column, and a toothed ring is fixedly installed on the outer side of the toothed ring.

[0012] Furthermore, a second gear is rotatably mounted on one side of the pump body close to the liquid inlet via a bearing and a rotating rod, and the second gear is meshed with the gear ring and the first rack at the same time.

[0013] Furthermore, a plurality of guide rods are fixedly installed on both sides of the movable plate, a plurality of small springs are fixedly installed on both sides of the movable plate, and the small springs are respectively located on the outside of the guide rods, a rack 2 is fixedly installed on one end of the small spring away from the movable plate, a plurality of countersunk holes are opened on the side of the rack 2 close to the movable plate, the countersunk holes are located on the outside of the guide rods, and two limit rods are respectively located on the inner sides of the two guide grooves.

[0014] Furthermore, a short column is rotatably installed on one side of the pump body close to the liquid inlet through a bearing, and a gear three is fixedly installed on the outer side of the short column. A long rod is rotatably installed on one side of the pump body close to the liquid inlet through a bearing, and a bevel gear is fixedly installed on the outer side of the long rod. The short column and the long rod are connected by a belt drive group, and the belt drive group is located between gear three and the pump body.

[0015] Furthermore, the rotating shaft is installed in the interior of the C-shaped through pipe through a bearing, and two other bevel gears are fixedly installed on the outside of the rotating shaft. The two bevel gears are located between the two circulating fans. The two bevel gears on the outside of the rotating shaft face the same direction, and the bevel gear on the outside of the rotating shaft meshes with the bevel gear on the outside of the long rod.

[0016] Beneficial effects of the present invention:

[0017] (1) The dual-speed hydraulic manual pump described in the present invention adopts the design of a reciprocating mechanism and a filtering mechanism, so that when the pressure rod reciprocates up and down, it can drive the filter screen 2 to rotate continuously through the toothed ring, so that the rotating filter screen 2 can dynamically filter the hydraulic oil entering the inner side of the pump body, and the rotation of the toothed ring can continuously drive the exhaust fan to rotate, so that the hydraulic oil on the inner side of the toothed ring can drive the impurities attached to the surface of the filter screen 2 to fall off, so that the filter screen 2 can always be in a clean and impurity-free dynamic filtering state, thereby improving the filtering effect.

[0018] (2) The dual-speed hydraulic manual pump described in the present invention adopts the linkage of the reciprocating mechanism and the constant direction mechanism, so that when the pressure rod moves downward, the left rack 2 drives the rotating shaft to rotate in the positive direction, and when the pressure rod moves upward, the right rack 2 drives the rotating shaft to rotate in the positive direction, so that the rotating shaft can drive the circulating fan to rotate in the positive direction all the time, thereby making the hydraulic oil in the liquid storage shell and the inner side of the C-shaped through pipe always in a circulating flow state, ensuring that no impurities will stay near the filter screen 2, and the impurities are concentrated at the filter screen 1 position inside the C-shaped through pipe, further improving the filtering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the manual pump of the present invention;

[0021] Figure 2 It is a schematic diagram of the cross-sectional structure of the C-shaped through pipe of the present invention;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the inner side of the liquid storage shell of the present invention;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the reciprocating mechanism and the constant direction mechanism of the present invention;

[0024] Figure 5 For the present invention Figure 4 Schematic diagram of the explosion three-dimensional structure;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the inner side of the tooth groove ring of the present invention;

[0026] Figure 7 For the present invention Figure 6 A schematic diagram of the local enlarged structure at B;

[0027] Figure 8 For the present invention Figure 5 A local enlarged structural schematic diagram of A;

[0028] Fig. 9 It is a three-dimensional structural schematic diagram of the rotating shaft of the present invention;

[0029] Fig.10 For the present invention Fig. 9 Schematic diagram of the side structure.

[0030] In the figure: 1, pump body; 2, plug rod; 3, pressure rod; 4, liquid inlet; 5, liquid outlet; 6, side rod; 7, C-shaped through pipe; 8, filter screen 1; 9, liquid storage shell; 10, liquid inlet valve; 11, reciprocating mechanism; 111, reciprocating rod; 112, contact end; 113, thick spring; 114, connecting plate; 115, rack 1; 116, connecting rod; 12, filtering mechanism; 121, fixing ring; 122, toothed ring; 123, filter screen 2; 124. Gear 1; 125. Toothed column; 126. Exhaust fan; 127. Gear ring; 13. Gear 2; 14. Constant direction mechanism; 141. Movable plate; 142. Guide rod; 143. Small spring; 144. Rack 2; 145. Countersunk hole; 146. Limit rod; 15. Guide groove; 16. Short column; 17. Gear 3; 18. Long rod; 19. Belt drive group; 20. Bevel gear; 21. Rotating shaft; 22. Circulating fan. DETAILED DESCRIPTION

[0031] In order to make the technical means, technical features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0032] Example: Figure 1-Figure 10 As shown, a dual-speed hydraulic manual pump described in the present invention includes a pump body 1, a plug rod 2 which can move up and down is arranged on the top of the pump body 1, a pressure rod 3 is hingedly installed on the top of the plug rod 2, a liquid inlet 4 is arranged on one side of the pump body 1, a liquid outlet 5 which is connected to the inside is arranged on one side of the pump body 1, and the liquid outlet 5 is surrounded by a C-shaped through pipe 7.

[0033] Specifically, the pump body 1 can provide space for the plug rod 2 to move up and down, and at the same time, the pump body 1 and the plug rod 2 are sealed. When the pressure rod 3 moves upward, negative pressure is generated inside the pump body 1, so that the pump body 1 sucks the external hydraulic oil into the inside of the pump body 1 through the liquid inlet 4. When the pressure rod 3 moves downward, the pressure inside the pump body 1 increases, so that the hydraulic oil inside the pump body 1 is discharged through the liquid outlet 5.

[0034] In this embodiment, a C-shaped through-tube 7 is provided on the outside of the pump body 1, a filter screen 8 is fixedly installed on the inner side of the C-shaped through-tube 7, a liquid storage shell 9 is provided on the side of the pump body 1 close to the liquid inlet 4, and the liquid storage shell 9 is communicated with the C-shaped through-tube 7, a side rod 6 is fixedly installed on the side of the plug rod 2 close to the liquid inlet 4, and the side rod 6 passes through the interior of the pressure rod 3, and a liquid inlet valve 10 is installed through one side of the liquid storage shell 9.

[0035] Specifically, the C-shaped through-tube 7 and the liquid storage shell 9 can form a closed space to provide storage space for the hydraulic oil. The C-shaped through-tube 7 can provide a placement space for the filter screen 8, and the filter screen 8 can filter the hydraulic oil passing through. The liquid storage shell 9 can provide a through space for the liquid inlet valve 10, and the liquid inlet valve 10 can provide a flow channel for the external hydraulic oil to enter the inner side of the liquid storage shell 9.

[0036] In this embodiment, a reciprocating mechanism 11 is provided on the top of the liquid storage shell 9 through a sealing ring. The reciprocating mechanism 11 is assembled to reciprocate up and down through the reciprocating rod 111 to drive a rack 115; the reciprocating mechanism 11 includes a reciprocating rod 111, and two racks 115 are provided on the side of the reciprocating rod 111 close to the pump body 1 through a connecting plate 114, and a plurality of connecting rods 116 are fixedly installed between the two racks 115. A contact end 112 is fixedly installed on the top of the reciprocating rod 111, and the contact end 112 is located at the bottom of the side rod 6. A thick spring 113 is fixedly installed on the top of the liquid storage shell 9, and the thick spring 113 is located on the outside of the reciprocating rod 111, and one end of the thick spring 113 is fixedly connected to the bottom of the contact end 112. The part of the reciprocating rod 111 located on the inner side of the liquid storage shell 9 is a semi-cylindrical shape, and the plane of the semi-cylindrical shape faces the pump body 1, and the rack 115 is fixedly installed on the plane part through the connecting plate 114.

[0037] Specifically, the reciprocating rod 111 can provide stable support for the rack 115 through the connecting plate 114, the rack 115 can provide stable support for the connecting rod 116, the liquid storage shell 9 can provide stable support for the coarse spring 113, and the coarse spring 113 can provide power for the reciprocating rod 111 to move upward. When the side rod 6 drives the reciprocating rod 111 to move downward, the coarse spring 113 is compressed. When the side rod 6 moves upward, the coarse spring 113 can use the automatic elastic force to drive the reciprocating rod 111 to move upward.

[0038] In the present embodiment, two filtering mechanisms 12 are symmetrically arranged on one side of the pump body 1 close to the liquid inlet 4. The filtering mechanism 12 is equipped to filter the liquid about to enter the liquid inlet 4 through the second filter screen 123, and utilize the reciprocating motion of the rack 115 to drive the exhaust fan 126 to rotate, so as to clean the impurities on the surface of the second filter screen 123; the filtering mechanism 12 includes a toothed ring 122, and the second filter screen 123 is fixedly installed on the inner side of the toothed ring 122, and the exhaust fan 126 is transmission-arranged on the inner side of the toothed ring 122. The filtering mechanism 12 corresponds to the liquid inlet 4 one by one. The filtering mechanism 12 also includes a fixed ring 121, which is fixedly installed on one side of the pump body 1, and the fixed ring 121 is located on the outer side of the liquid inlet 4. The toothed ring 122 is rotatably installed on the inner side of the fixed ring 121 through a bearing. A tooth groove is provided in an annular manner on the inner side of the groove ring 122 near the pump body 1, and a gear 124 is rotatably installed on one side of the pump body 1 through a bearing and a rotating rod. The gear 124 is located between the liquid inlet 4 and the tooth groove ring 122. A tooth groove column 125 is rotatably installed on one side of the pump body 1 through a bearing. The tooth groove column 125 is located between the liquid inlet 4 and the gear 124. A tooth groove is provided in an annular manner on the surface of the tooth groove column 125, and the gear 124 is meshed with the tooth grooves of the tooth groove ring 122 and the tooth grooves of the tooth groove column 125 at the same time. The discharge fan 126 is fixedly connected to one end of the tooth groove column 125, and a tooth ring 127 is fixedly installed on the outer side of the tooth groove ring 122. A gear 2 13 is rotatably installed on the side of the pump body 1 near the liquid inlet 4 through a bearing and a rotating rod, and the gear 2 13 is meshed with the tooth ring 127 and the rack 115 at the same time.

[0039] Specifically, the pump body 1 can provide a stable support for the fixed ring 121, and the fixed ring 121 can provide a rotational support for the toothed ring 122 through the bearing. The toothed grooves of the toothed ring 122 can mesh with the gear 124. The gear 124 utilizes the meshing action with the toothed ring 122 and the toothed column 125 at the same time to increase the rotation speed of the discharge fan 126, which can better separate the impurities from the filter screen 123 and improve the filtering effect. The toothed ring 127 on the outside of the toothed ring 122 can mesh with the gear 2 13. The gear 2 13 is used to increase the maximum distance that the reciprocating rod 111 can move up and down, thereby increasing the rotation angle of the toothed ring 122, so that when the toothed ring 122 drives the filter screen 123 to rotate, the area of ​​the filter screen 123 passing through the liquid inlet 4 can be increased, thereby increasing the filtering effect of the filter screen 123.

[0040] In this embodiment, a constant direction mechanism 14 is slidably provided on the outer side of the connecting rod 116. The constant direction mechanism 14 is assembled to cooperate with the guide groove 15 through a limit rod 146 and utilize the reciprocating motion of the rack 115 to realize that the rotating shaft 21 drives the circulating fan 22 to rotate in only one direction. The constant direction mechanism 14 includes a movable plate 141 slidably provided on the outer side of the connecting rod 116. A limit rod 146 is provided on the side of the movable plate 141 close to the pump body 1. A plurality of guide rods 142 are fixedly installed on both sides of the movable plate 141. A plurality of small springs 143 are fixedly installed on both sides of the movable plate 141, and the small springs 143 are respectively located on the outer sides of the guide rods 142. A rack 2 144 is fixedly installed on one end of the small spring 143 away from the movable plate 141. A plurality of countersunk holes 145 are provided on the side of the rack 2 144 close to the movable plate 141. The countersunk holes 145 are located on the outer side of the guide rod 142. The two limit rods 146 are respectively located on the inner sides of the two guide grooves 15.

[0041] Specifically, the connecting rod 116 can provide a stable support for the left and right movement of the movable plate 141, the movable plate 141 can provide a stable support for the limit rod 146, the limit rod 146 can use the resistance effect with the guide groove 15 to drive the movable plate 141 to move left and right, the movable plate 141 can provide a stable support for the guide rod 142, the rack 144 can provide a space for the countersunk hole 145, the guide rod 142 cooperates with the countersunk hole 145 to provide a guiding effect for the left and right movement of the rack 144, and the movable plate 141 can provide a stable support for the small spring 143. The countersunk hole 145 is a solid support and can provide a storage space for the small spring 143. When the movable plate 141 and the rack 2 144 are close to each other, the small spring 143 is squeezed so that the small spring 143 is completely contracted inside the countersunk hole 145. The movable plate 141 and the rack 2 144 are elastically connected through the small spring 143, so that when the rack 2 144 is close to the gear 3 17, the elastic change process of the small spring 143 is used to provide adjustment time for the meshing of the rack 2 144 and the gear 3 17, thereby ensuring that the rack 2 144 and the gear 3 17 can be smoothly meshed.

[0042] In the present embodiment, two guide grooves 15 are provided on one side of the pump body 1 close to the liquid inlet 4, and two circulation fans 22 are rotatably installed inside the C-shaped through-tube 7 through a rotating shaft 21; a short column 16 is rotatably installed on one side of the pump body 1 close to the liquid inlet 4 through a bearing, and a gear three 17 is fixedly installed on the outer side of the short column 16; a long rod 18 is rotatably installed on one side of the pump body 1 close to the liquid inlet 4 through a bearing, and a bevel gear 20 is fixedly installed on the outer side of the long rod 18; the short column 16 and the long rod 18 are connected by a belt transmission group 19, and the belt transmission group 19 is located between the gear three 17 and the pump body 1; the rotating shaft 21 is installed in the interior of the C-shaped through-tube 7 through a bearing, and two other bevel gears 20 are fixedly installed on the outer side of the rotating shaft 21, and the two bevel gears 20 are located between the two circulation fans 22, and the two bevel gears 20 on the outer side of the rotating shaft 21 face the same direction, and the bevel gear 20 on the outer side of the rotating shaft 21 meshes with the bevel gear 20 on the outer side of the long rod 18.

[0043] In this embodiment, if Fig. 9 As shown, the rotation direction of the rotating shaft 21 is positive rotation, as shown in FIG. Fig.10 As shown, the rotation direction of gear three 17 is clockwise.

[0044] Specifically, the pump body 1 can provide a space for the guide groove 15, and the guide groove 15 can use the resistance effect with the limit rod 146 to guide the limit rod 146 to move, so that the reciprocating rod 111 is in the last distance of the up and down reciprocating motion, and the reaction force of the limit rod 146 drives the movable plate 141 to move left and right, and then intermittently drives the racks 2 144 on both sides to mesh with the two gears 3 17, so that the two gears 3 17 alternately drive the rotating shaft 21 to rotate forward with the reciprocating motion of the reciprocating rod 111, and the rotating shaft 21 drives the circulating fan 22 to rotate in the same direction, so that the hydraulic oil in the C-shaped through pipe 7 and the inner side of the liquid storage shell 9 can circulate.

[0045] Working principle: the staff first connects the external oil pipe with the liquid inlet valve 10, and the hydraulic oil enters the inner side of the liquid storage shell 9 through the liquid inlet valve 10, and then grasps one end of the pressure rod 3 and presses it up and down reciprocatingly. When the pressure rod 3 is pressed downward, the pressure rod 3 discharges the hydraulic oil in the pump body 1 to the outside through the liquid outlet 5 through the plug rod 2, and the pressure rod 3 moves downward to drive the side rod 6 to contact the contact end 112, and drives the reciprocating rod 111 to move downward through the contact end 112, and the contact end 112 moves downward to squeeze the thick spring 113, and at the same time, the reciprocating rod 111 drives the rack 115 to move downward, so that the rack 115 drives the gear ring 127 to rotate through the meshing action of the gear 2 13, so that the gear ring 127 drives the tooth groove ring 12 under the action of external force. 2 rotates, the toothed ring 122 drives the filter screen 123 to rotate, and the toothed ring 122 drives the toothed column 125 to rotate through the meshing action of the inner toothed groove and the gear 1 124, so that the toothed column 125 drives the discharge fan 126 to rotate, and the rotation of the discharge fan 126 can discharge the hydraulic oil inside the toothed ring 122 to the outside of the toothed ring 122, so that the hydraulic oil passes through the filter screen 123 and drives the impurities on the surface of the filter screen 123 to separate. Since the filter screen 123 is always in a rotating state under the action of the toothed ring 122, it can cooperate with the discharge fan 126 to clean up all the impurities on the surface of the filter screen 123, so that the impurities will not adhere to the surface of the filter screen 123, thereby improving the filtering effect of the filter screen 123;

[0046] During the downward movement of the reciprocating rod 111, the rack 115 drives the movable plate 141 to move downward through the connecting rod 116, so that the movable plate 141 drives the racks 2 144 on both sides to move downward through the guide rod 142. At this time, only the rack 2 144 on the left side can mesh with the gear 3 17 on the left side (such as Fig.10 As shown), the gear three 17 on the left rotates clockwise, and the gear three 17 on the left drives the bevel gear 20 on the left to rotate clockwise by the transmission effect of the belt drive group 19, so that the bevel gear 20 drives the rotating shaft 21 to rotate forward by meshing, and the rotating shaft 21 drives the circulating fan 22 to rotate, so that the circulating fan 22 drives the hydraulic oil inside the liquid storage shell 9 to flow from left to right, and the hydraulic oil passes near the filter screen 2 123 when flowing, so that the hydraulic oil can drive the impurities separated from the surface of the filter screen 2 123 to move to the right, and the hydraulic oil enters the C-shaped through pipe 7 for circulation, and intercepts the impurities on the inside of the C-shaped through pipe 7 under the action of the filter screen 1 8. Under the action of the circulating fan 22, the circulation of the hydraulic oil inside the liquid storage shell 9 and the C-shaped through pipe 7 can timely clean the impurities near the filter screen 2 123, ensuring that no impurities will accumulate near the filter screen 2 123;

[0047] When the reciprocating rod 111 is about to move to the lowest position, the movable plate 141 drives the limiting rod 146 to continue to move downward along the inner side of the guide groove 15, so that the limiting rod 146 contacts the inner side of the bottom wall of the guide groove 15, and the guide rod 142 moves obliquely downward under the resistance of the inclined surface of the guide groove 15, so that the guide rod 142 uses the reaction force to drive the movable plate 141 to move to the right side during the downward movement, so that the movable plate 141 drives the left rack 2 144 to gradually separate from the left gear 3 17, and the movable plate 141 drives the right rack 2 144 to gradually approach the right gear 3 17. When the reciprocating rod 111 moves to the lowest position, the left rack 2 144 is completely separated from the left gear 3 17, and at the same time, the right rack 2 144 contacts and meshes with the right rack 3. Since the movable plate 141 and the rack 2 144 are elastically connected by the small spring 143, it is ensured that the rack 2 144 can mesh with the gear 3 17.

[0048] When the pressure rod 3 moves upward, the pump body 1 sucks the external hydraulic oil into the inner side of the pump body 1 through the negative pressure, and enters the inner side of the pump body 1 through the liquid inlet 4. The contact end 112 drives the reciprocating rod 111 to move upward under the elastic force of the thick spring 113, so that the filter screen 123 rotates, and the hydraulic oil inside the liquid storage shell 9 passes through the filter screen 123 and enters the inner side of the liquid inlet 4, so that the filter screen 123 corresponds to the position of the liquid inlet 4 to filter the impurities in the hydraulic oil, and as the filter screen 123 rotates, the filter screen 123 is always in a dynamic filtering state, and the discharge fan 126 is also always in a rotating state, which can ensure that no impurities are attached to the surface of the filter screen 123, so that the filter screen 123 is always in a clean and impurity-free dynamic filtering state, thereby improving the filtering effect;

[0049] As the reciprocating rod 111 moves upward, the movable plate 141 drives the rack 2 144 to move upward, so that the rack 2 144 on the right side engages with the gear 3 17 on the right side to drive the gear 3 17 on the right side to rotate clockwise. The clockwise rotation of the gear 3 17 on the right side can drive the rotating shaft 21 to rotate in the positive direction, so that during the up and down reciprocating process of the reciprocating rod 111, the rotating shaft 21 is always in a positive rotation state, so that the hydraulic oil in the liquid storage shell 9 and the C-shaped through pipe 7 circulates in one direction all the time, ensuring that no impurities will stay near the filter screen 2 123, further improving the filtering effect.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A dual-speed hydraulic manual pump, comprising a pump body (1), a plug rod (2) movable up and down is arranged on the top of the pump body (1), a pressure rod (3) is hingedly mounted on the top of the plug rod (2), and a liquid inlet (4) is arranged on one side of the pump body (1), characterized in that: The pump body (1) is provided with a C-shaped through pipe (7) on the outside, a liquid storage shell (9) is provided on the side of the pump body (1) close to the liquid inlet (4), and the liquid storage shell (9) is in communication with the C-shaped through pipe (7), a reciprocating mechanism (11) is provided on the top of the liquid storage shell (9) through a sealing ring, the reciprocating mechanism (11) comprises a reciprocating rod (111), the reciprocating rod (111) is provided with two racks (115) on the side close to the pump body (1) through a connecting plate (114), a plurality of connecting rods (116) are fixedly installed between the two racks (115), and two filtering mechanisms (12) are symmetrically provided on the side of the pump body (1) close to the liquid inlet (4), the filtering mechanisms (12) comprises a toothed ring (122), a filter screen (123) is fixedly mounted on the inner side of the toothed ring (122), a discharge fan (126) is transmission-arranged on the inner side of the toothed ring (122), a constant direction mechanism (14) is slidably mounted on the outer side of the connecting rod (116), the constant direction mechanism (14) comprises a movable plate (141) slidably mounted on the outer side of the connecting rod (116), a limit rod (146) is arranged on the side of the movable plate (141) close to the pump body (1), two guide grooves (15) are arranged on the side of the pump body (1) close to the liquid inlet (4), and two circulation fans (22) are rotatably mounted inside the C-shaped through pipe (7) via a rotating shaft (21); A reciprocating mechanism (11), which is configured to reciprocate up and down by driving a rack (115) through a reciprocating rod (111); The filter mechanism (12) is configured to filter the liquid about to enter the liquid inlet (4) through the second filter screen (123), and utilize the reciprocating motion of the first rack (115) to drive the exhaust fan (126) to rotate, thereby cleaning the impurities on the surface of the second filter screen (123); The constant direction mechanism (14) is assembled to realize that the rotating shaft (21) drives the circulating fan (22) to rotate in only one direction by cooperating with the limiting rod (146) and the guide groove (15) and utilizing the reciprocating motion of the rack (115); A liquid outlet (5) communicating with the interior is provided on one side of the pump body (1), and the liquid outlet (5) is surrounded by a C-shaped through pipe (7), a filter screen (8) is fixedly installed on the inner side of the C-shaped through pipe (7), a side rod (6) is fixedly installed on the side of the plug rod (2) close to the liquid inlet (4), and the side rod (6) passes through the interior of the pressure rod (3), and a liquid inlet valve (10) is installed through one side of the liquid storage shell (9); The filtering mechanism (12) corresponds to the liquid inlet (4) in a one-to-one manner. The filtering mechanism (12) further comprises a fixing ring (121). The fixing ring (121) is fixedly mounted on one side of the pump body (1), and the fixing ring (121) is located outside the liquid inlet (4). A toothed ring (122) is rotatably mounted on the inner side of the fixing ring (121) via a bearing. A toothed ring (122) is provided with a toothed ring in an annular shape at a position close to the pump body (1). A gear (124) is rotatably mounted on one side of the pump body (1) via a bearing and a rotating rod. The gear (124) is located inside the liquid inlet. A toothed column (125) is rotatably mounted on one side of the pump body (1) via a bearing at a position between the liquid inlet (4) and the toothed ring (122); the toothed column (125) is located between the liquid inlet (4) and the gear one (124); a toothed groove is provided in an annular shape on the surface of the toothed column (125); the gear one (124) is meshed with the toothed grooves of the toothed ring (122) and the toothed grooves of the toothed column (125); a discharge fan (126) is fixedly connected to one end of the toothed column (125); and a toothed ring (127) is fixedly mounted on the outer side of the toothed ring (122).

2. A dual-speed hydraulic hand pump according to claim 1, characterized in that: A contact end (112) is fixedly mounted on the top of the reciprocating rod (111), and the contact end (112) is located at the bottom of the side rod (6). A thick spring (113) is fixedly mounted on the top of the liquid storage shell (9), and the thick spring (113) is located outside the reciprocating rod (111), and one end of the thick spring (113) is fixedly connected to the bottom of the contact end (112). The portion of the reciprocating rod (111) located inside the liquid storage shell (9) is in a semi-cylindrical shape, and the plane of the semi-cylindrical shape faces the pump body (1). A rack (115) is fixedly mounted on the plane portion through a connecting plate (114).

3. A dual-speed hydraulic hand pump according to claim 1, characterized in that: A second gear (13) is rotatably mounted on one side of the pump body (1) close to the liquid inlet (4) via a bearing and a rotating rod, and the second gear (13) is meshed with a gear ring (127) and a rack (115) at the same time.

4. A dual-speed hydraulic hand pump according to claim 1, characterized in that: A plurality of guide rods (142) are fixedly mounted on both sides of the movable plate (141), a plurality of small springs (143) are fixedly mounted on both sides of the movable plate (141), and the small springs (143) are respectively located on the outside of the guide rods (142), a second rack (144) is fixedly mounted on one end of the small spring (143) away from the movable plate (141), a plurality of countersunk holes (145) are provided on one side of the second rack (144) close to the movable plate (141), and the countersunk holes (145) are located on the outside of the guide rods (142), and two limit rods (146) are respectively located on the inside of the two guide grooves (15).

5. A dual-speed hydraulic manual pump according to claim 4, characterized in that: A short column (16) is rotatably mounted on one side of the pump body (1) close to the liquid inlet (4) via a bearing, a gear three (17) is fixedly mounted on the outer side of the short column (16), a long rod (18) is rotatably mounted on one side of the pump body (1) close to the liquid inlet (4) via a bearing, a bevel gear (20) is fixedly mounted on the outer side of the long rod (18), the short column (16) and the long rod (18) are connected in transmission via a belt transmission group (19), and the belt transmission group (19) is located between the gear three (17) and the pump body (1).

6. A dual-speed hydraulic manual pump according to claim 5, characterized in that: The rotating shaft (21) is installed in the C-shaped through pipe (7) through a bearing, and two other bevel gears (20) are fixedly installed on the outer side of the rotating shaft (21). The two bevel gears (20) are located between the two circulating fans (22). The two bevel gears (20) on the outer side of the rotating shaft (21) face the same direction, and the bevel gears (20) on the outer side of the rotating shaft (21) are meshed with the bevel gears (20) on the outer side of the long rod (18).

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