A high-precision large-flow pump head

Abstract

The application discloses a high-precision large-flow pump head, which comprises a plunger pump body, one side of the plunger pump body is provided with a pump head body, one side of the pump head body is provided with a temperature adjusting mechanism, the temperature adjusting mechanism comprises a heating box, an electromagnetic heating controller is arranged on the top of the heating box, a connecting pipe is arranged on the opening of the top of the heating box, a temperature sensor is arranged on the front surface of the connecting pipe, an electromagnetic shielding cover is arranged in the heating box, an L-shaped plate is fixed to the inside of the electromagnetic shielding cover close to the top, three circular holes are arranged on the bottom of the L-shaped plate at equal intervals, an L-shaped pipe is fixed in each circular hole, and the temperature adjusting mechanism is arranged, so that the poor flowability of the oil liquid in the plunger pump head body caused by low oil temperature during conveying can be effectively avoided, the cavitation in the plunger pump head body is avoided, and the service life of the plunger pump head body is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pump head, more particularly, to a high-precision large-flow pump head. BACKGROUND

[0002] The plunger pump is one of the water pumps, mainly composed of a pump body and a pump head, and is also an important device of a hydraulic system, which is generally divided into a single plunger pump, a horizontal plunger pump, an axial plunger pump and a radial plunger pump, and is widely used in the industrial field.

[0003] In the prior art, for example, Chinese Patent No. CN210164626U discloses a plunger pump head structure, comprising a pump head body, liquid inlet pipes and liquid outlet pipes are arranged on both sides of the pump head body, valves for controlling the opening and closing of the liquid inlet pipes and the liquid outlet pipes are arranged between the liquid inlet pipes, the liquid outlet pipes and the pump head body, a plunger groove communicating with the liquid inlet pipes and the liquid outlet pipes is arranged in the pump head body, a plunger is matched in the plunger groove, an intermediate ring is arranged on one side of the middle part of the plunger, a liquid return pipe is arranged at the position of the intermediate ring in the plunger groove, and the liquid return pipe communicates with the plunger groove and the liquid inlet pipe. The plunger pump head structure has the following beneficial effects: it can prevent liquid leakage and has a good environmental protection effect.

[0004] In the above-mentioned patent, although the plunger pump head solves the problem of liquid leakage and achieves the effect of environmental protection, the plunger pump head does not have a temperature adjusting mechanism. When the plunger pump needs to transport oil with low temperature, the low oil temperature may cause the flowability of the oil in the pump head to decrease, and may also cause cavitation in the pump head, thereby reducing the service life of the plunger pump head. SUMMARY

[0005] In order to overcome the defect that the plunger pump head in the prior art does not have a temperature adjusting mechanism, and when the plunger pump transports liquid with low temperature, the flowability of the oil in the pump head body decreases, and cavitation occurs in the pump head body, the technical problem to be solved by the present application is to provide a high-precision large-flow pump head, which has a temperature adjusting mechanism, can improve the flowability of the liquid when flowing, and improve the service life of the pump head.

[0006] To achieve this purpose, the technical scheme adopted by the present application is as follows:

[0007] The present application provides a high-precision large-flow pump head, comprising a plunger pump body, a pump head body is arranged on one side of the plunger pump body, and a temperature adjusting mechanism is arranged on one side of the pump head body.

[0008] The temperature adjusting mechanism comprises a heating box, an electromagnetic heating controller is mounted on the top of the heating box, a connecting pipe is mounted on the top opening of the heating box, a temperature sensor is mounted on the front surface of the connecting pipe, an electromagnetic shielding cover is mounted in the heating box, an L-shaped plate is fixed near the top inside the electromagnetic shielding cover, three circular holes are equidistantly arranged on the bottom of the L-shaped plate, an L-shaped pipe is fixed in each circular hole, two electromagnetic shielding plates are equidistantly fixed in the electromagnetic shielding cover, a metal heating pipe is fixed on the outer wall of each L-shaped pipe, an insulating heat preservation sleeve is fixed on the outer wall of each metal heating pipe, an electromagnetic coil is movably sleeved on the outer wall of each insulating heat preservation sleeve, a four-way pipe is mounted between the oil inlet ends of the three L-shaped pipes, an installation plate is mounted on the front surface of the heating box, two installation grooves are formed on the front surface of the installation plate, a main controller is mounted in one installation groove, and a temperature controller is mounted in the other installation groove.

[0009] In the preferable technical scheme of the present application, the detection end of the temperature sensor extends into the connecting pipe, the oil inlet end of each L-shaped pipe movably penetrates the inner wall of the electromagnetic shielding cover, the oil inlet end of each L-shaped pipe movably penetrates the inner wall of the heating box, and the cooperation of the electromagnetic shielding cover and the electromagnetic shielding plate can ensure that the metal heating pipe is stably heated.

[0010] In the preferable technical scheme of the present application, the two ends of each electromagnetic coil movably penetrate the top of the inner wall of the electromagnetic shielding cover, the two ends of each electromagnetic coil movably penetrate the bottom of the inner wall of the heating box, and the two ends of each electromagnetic coil are electrically connected with the electromagnetic heating controller, so that the cooperation of the electromagnetic coil and the electromagnetic heating controller can heat the metal heating pipe.

[0011] In the preferable technical scheme of the present application, a hollow block is fixed in the oil outlet end of each L-shaped pipe, a connecting rod is rotatably connected with the hollow block through a bearing, and the bottom end of each connecting rod is slidably embedded in the inner wall of each L-shaped pipe, so that the cooperation of the hollow block, the bearing and the connecting rod can stably rotate the auger piece.

[0012] In the preferable technical scheme of the present application, an auger piece is fixed on the outer surface of each connecting rod, and each auger piece is movably sleeved in each L-shaped pipe, a cover plate is rotatably connected with the front surface of the installation plate, a protection plate is arranged on the top of the heating box, two first L-shaped blocks are fixed on the top of the protection plate, and the electromagnetic coil can be protected under the action of the protection plate.

[0013] In the preferable technical scheme of the present application, the two first L-shaped blocks are installed on the surface of the electromagnetic heating controller through first screws, the bottom of the protection plate is fixed with two second L-shaped blocks, the two second L-shaped blocks are installed on the top of the heating box through second screws, and the bottom of the heating box is fixed with four L-shaped frames at four corners, so that the protection plate can be tightly fixed under the cooperation of the first L-shaped blocks and the second L-shaped blocks.

[0014] In the preferable technical scheme of the present application, the pump head body comprises a shell, the shell is connected with the plunger pump body through bolts, an oil inlet pipe is installed on the oil inlet of the shell, and the oil inlet pipe is connected with the oil outlet end of the connecting pipe, so that the heated oil liquid guided from the connecting pipe can be guided into the installation hole inside the oil inlet of the shell under the action of the oil inlet pipe.

[0015] In the preferable technical scheme of the present application, the inner wall of the shell is provided with a buffer groove, the inner wall top of the buffer groove and the inner wall of the shell are both provided with installation holes, the inner wall of each installation hole is fixedly installed with a spring, and the pulsation of the oil liquid pressure can be reduced under the action of the buffer groove.

[0016] In the preferable technical scheme of the present application, the opposite ends of the two springs are both fixedly installed with spheres, one of the spheres is inside one of the installation holes, and the other sphere is between the inside of the shell and the inside of the other installation hole, so that the corresponding sphere can be vertically automatically reset under the cooperation of the spring and the corresponding set of limiting blocks and installation holes.

[0017] In the preferable technical scheme of the present application, the inside of one of the installation holes and the inside of the shell are both fixed with two limiting blocks, the four limiting blocks are divided into two sets, and each sphere is between the opposite sides of each set of limiting blocks, so that the vertical movement of the sphere can be ensured under the action of the limiting blocks.

[0018] The present application has the following beneficial effects:

[0019] The high-precision large-flow pump head provided by the application is provided with a temperature adjusting mechanism, when the oil liquid to be transported is shunted into the interiors of three L-shaped pipes, the main controller is directly started at this time, and the threshold value is set, then the main controller transmits the set temperature threshold value to the interior of the temperature controller in the form of an electric signal, at this time the temperature controller processes the received electric signal and directly controls the electromagnetic heating controller to start, at this time the electromagnetic heating controller that is started controls all the electromagnetic coils to generate a high-speed changing alternating magnetic field, realizes that the corresponding metal heating pipe is heated, then the corresponding L-shaped pipe is heated through the heated metal heating pipe, after that the oil passing through the interior of the L-shaped pipe can be heated, then the heated oil liquid flows out from the interior of the corresponding L-shaped pipe to the outlet, when the heated oil liquid is about to move to the oil outlet, at this time under the cooperation of the corresponding hollow block, connecting rod and auger piece, the speed of the heated oil moving out of the corresponding L-shaped pipe is directly reduced, that is, the oil passing through the interior of the L-shaped pipe can be fully heated, this method not only can heat the oil liquid to be transported, but also can adjust the temperature of the metal heating pipe by the electromagnetic coil, detect the temperature of the heated oil liquid, and effectively avoid the situation that the poor flowability of the oil liquid in the interior of the plunger pump head body caused by the low temperature of the transported oil leads to the cavitation in the interior of the pump head body, effectively improve the service life of the high-precision large-flow pump head body.

[0020] When the plunger pump needs to be used, the plunger pump body is directly started at this time, which drives the plunger rod inside to slowly move out from the inside of the shell of the pump head body. When the plunger rod moves, the air pressure in the shell will change at this time. At this time, the ball at the oil inlet of the shell will move up under the cooperation of the corresponding set of limiting blocks, and the spring is stretched. The ball at the oil outlet of the shell is tightly fixed under the action of the air pressure in the shell. When the ball at the oil inlet of the shell moves, a large suction force is generated at the inlet of the shell. When the heated oil liquid enters the inside of the shell from the mounting hole at the oil inlet of the shell and reaches a certain amount of oil in the shell, the plunger pump body drives the plunger rod inside to move back, and when it enters the inside of the shell again, the ball at the oil inlet of the shell is directly vertically reset to the initial position under the cooperation of the corresponding set of limiting blocks and the spring connected thereto, and is tightly attached to the outlet of the corresponding mounting hole. The ball at the oil outlet of the shell directly vertically moves up under the cooperation of the air pressure in the shell and the corresponding set of limiting blocks. When the ball at the oil outlet of the shell moves, the spring connected thereto is stretched. At this time, the heated oil liquid at the oil inlet of the shell enters the inside of the buffer tank, then enters the mounting hole at the oil outlet of the shell, and finally is discharged from the outlet of the mounting hole. When the plunger rod in the plunger pump body continuously moves back and forth in the shell on the pump head body, the plunger pump can transport the heated oil liquid. This method can effectively reduce the pulsation of the oil liquid pressure and effectively improve the service life of the pump head body. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a perspective view of the plunger pump body, the pump head body and the temperature adjusting mechanism of the high-precision large-flow pump head of the present application;

[0022] Figure 2 FIG. 2 is a perspective view of the plunger pump body, the pump head body and the temperature adjusting mechanism of the high-precision large-flow pump head of the present application from another angle;

[0023] Figure 3 FIG. 3 is a perspective view of the temperature adjusting mechanism of the high-precision large-flow pump head of the present application;

[0024] Figure 4 FIG. 4 is a perspective view of the temperature adjusting mechanism of the high-precision large-flow pump head of the present application from a top view angle;

[0025] Figure 5 FIG. 5 is a sectional perspective view of the temperature adjusting mechanism of the high-precision large-flow pump head of the present application;

[0026] Figure 6 This is a three-dimensional structural diagram of another angle temperature adjustment mechanism of a high-precision, high-flow pump head according to the present invention.

[0027] Figure 7 This is a perspective view of the plunger pump body of a high-precision, high-flow-rate pump head according to the present invention.

[0028] Figure 8 This is a three-dimensional cross-sectional view of the pump head body of a high-precision, high-flow pump head according to the present invention.

[0029] Figure 9 This is a three-dimensional structural diagram of the heating box and electromagnetic shielding cover of a high-precision, high-flow pump head according to the present invention.

[0030] In the picture:

[0031] 1-Plunger pump body; 2-Pump head body; 3-Temperature control mechanism; 201-Housing shell; 202-Oil inlet pipe; 203-Mounting hole; 204-Spring; 205-Ball; 206-Limit block; 207-Buffer groove; 301-Heating box; 302-Electromagnetic heating controller; 303-Connecting pipe; 304-Temperature sensor; 305-Electromagnetic shield; 306-L-shaped plate; 307-Round hole; 308-L-shaped tube; 309-Electromagnetic shielding plate; 310-Metal heating tube; 311-Insulating sleeve; 312-Electromagnetic coil; 313-Hollow block; 314-Connecting rod; 315-Screwdriver plate; 316-Four-way pipe; 317-L-shaped frame; 318-Mounting plate; 319-Mounting groove; 320-Main controller; 321-Thermostat; 322-Cover plate; 323-Protective plate; 324-First L-shaped block; 325-Second L-shaped block. Detailed Implementation

[0032] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 As shown, the embodiment provides a high-precision, high-flow pump head, including a plunger pump body 1, a pump head body 2 on one side of the plunger pump body 1, and a temperature regulating mechanism 3 on one side of the pump head body 2.

[0034] The temperature adjusting mechanism 3 comprises a heating box 301, an electromagnetic heating controller 302 is installed on the top of the heating box 301, a connecting pipe 303 is installed at the opening of the top of the heating box 301, a temperature sensor 304 is installed on the front surface of the connecting pipe 303, an electromagnetic shielding cover 305 is installed in the heating box 301, an L-shaped plate 306 is fixed inside the electromagnetic shielding cover 305 close to the top position, three circular holes 307 are equidistantly arranged on the bottom of the L-shaped plate 306, an L-shaped pipe 308 is fixed in each circular hole 307, two electromagnetic shielding plates 309 are equidistantly fixed in the electromagnetic shielding cover 305, a metal heating pipe 310 is fixed on the outer wall of each L-shaped pipe 308, an insulating heat preservation sleeve 311 is fixed on the outer wall of each metal heating pipe 310, an electromagnetic coil 312 is movably sleeved on the outer wall of each insulating heat preservation sleeve 311, a four-way pipe 316 is installed between the oil inlet ends of the three L-shaped pipes 308, an installation plate 318 is installed on the front surface of the heating box 301, two installation grooves 319 are formed on the front surface of the installation plate 318, a main controller 320 is installed in one of the installation grooves 319, and a temperature controller 321 is installed in the other installation groove 319.

[0035] According to Figure 2 - Figure 6 and Figure 9 , the detection end of the temperature sensor 304 extends into the connecting pipe 303, the oil inlet end of each L-shaped pipe 308 movably penetrates the inner wall of the electromagnetic shielding cover 305, and the oil inlet end of each L-shaped pipe 308 movably penetrates the inner wall of the heating box 301, so that the metal heating pipe 310 can be stably heated under the cooperation of the electromagnetic shielding cover 305 and the electromagnetic shielding plate 309.

[0036] According to Figure 2 - Figure 6 and Figure 9 , the two ends of each electromagnetic coil 312 movably penetrate the top of the inner wall of the electromagnetic shielding cover 305, the two ends of each electromagnetic coil 312 movably penetrate the bottom of the inner wall of the heating box 301, the two ends of each electromagnetic coil 312 are electrically connected with the electromagnetic heating controller 302, the electromagnetic heating controller 302 is electrically connected with the temperature controller 321, the temperature controller 321 is electrically connected with the main controller 320, and the main controller 320 is electrically connected with the temperature sensor 304, so that the metal heating pipe 310 can be heated under the cooperation of the electromagnetic coil 312 and the electromagnetic heating controller 302.

[0037] According to Figure 3 - Figure 6As shown, the oil outlet end of each L-shaped pipe 308 is fixed with a hollow block 313, the inside of each hollow block 313 is rotatably connected with a connecting rod 314 through a bearing, the bottom end of each connecting rod 314 is slidably embedded in the inner wall of each L-shaped pipe 308, so that the hollow block 313, the bearing and the connecting rod 314 can stably rotate.

[0038] According to Figure 2 - Figure 6 and Figure 9 As shown, the outer surface of each connecting rod 314 is fixedly sleeved with an auger piece 315, each auger piece 315 is movably sleeved in the inside of each L-shaped pipe 308, the front surface of the mounting plate 318 is rotatably connected with a cover plate 322, the top of the heating box 301 is provided with a protective plate 323, the top of the protective plate 323 is fixed with two first L-shaped blocks 324, so that the electromagnetic coil 312 can be protected under the action of the protective plate 323.

[0039] According to Figure 2 - Figure 6 and Figure 9 As shown, the two first L-shaped blocks 324 are installed on the surface of the electromagnetic heating controller 302 through first screws, the bottom of the protective plate 323 is fixed with two second L-shaped blocks 325, the two second L-shaped blocks 325 are installed on the top of the heating box 301 through second screws, the bottom of the heating box 301 is fixed with four L-shaped frames 317, so that the protective plate 323 can be tightly fixed under the cooperation of the first L-shaped blocks 324 and the second L-shaped blocks 325.

[0040] According to Figure 1 - Figure 5 , Figure 7 and Figure 8 As shown, the pump head body 2 comprises a shell 201, the shell 201 is connected with the plunger pump body 1 through bolts, the oil inlet of the shell 201 is provided with an oil inlet pipe 202, the oil inlet pipe 202 is connected with the oil outlet end of the connecting pipe 303, so that the heated oil liquid flowing from the connecting pipe 303 can be guided to the inside of the installation hole 203 of the oil inlet of the shell 201 under the action of the oil inlet pipe 202.

[0041] According to Figure 2 and Figure 8 As shown, the inner wall of the shell 201 is provided with a buffer groove 207, the inner wall top of the buffer groove 207 and the inner wall of the shell 201 are both provided with an installation hole 203, the inner wall of each installation hole 203 is fixedly installed with a spring 204, so that the pulsation of the oil liquid pressure can be reduced under the action of the buffer groove 207.

[0042] According to Figure 2 and Figure 8As shown, the opposite ends of the two springs 204 are fixedly installed with balls 205, one of which is inside one of the mounting holes 203, and the other is between the inside of the shell 201 and the inside of the other mounting hole 203, so that the corresponding ball 205 can be automatically reset vertically under the cooperation of the spring 204 and the corresponding set of limiting blocks 206 and the mounting hole 203.

[0043] According to Figure 2 and Figure 8 As shown, the inside of one of the mounting holes 203 and the inside of the shell 201 are fixedly installed with two limiting blocks 206, and the four limiting blocks 206 are divided into two groups. Each ball 205 is between the opposite sides of each group of limiting blocks 206, so that the ball 205 can be guaranteed to move vertically under the action of the limiting block 206.

[0044] The effect achieved by the whole mechanism is: when the plunger pump is needed to deliver oil, the plunger pump body 1 and the pump head body 2 are first installed together, when the plunger pump body 1 and the pump head body 2 are installed together, the plunger rod of the plunger pump body 1 will extend into the inside of the shell 201 of the pump head body 2, then the inlet end of the oil inlet pipe 202 is connected with the oil outlet end of the connecting pipe 303, when everything is ready, the plunger pump body 1 is directly started, the plunger pump body 1 is started, the plunger rod inside the plunger pump body 1 is first slowly moved out from the inside of the shell 201 of the pump head body 2, when the plunger rod moves, the air pressure in the inside of the shell 201 will start to change, at this time the ball 205 at the oil inlet of the shell 201 will move up under the cooperation of a set of limiting blocks 206, and the spring 204 is stretched, and the ball 205 at the oil outlet of the shell 201 will be tightly fixed under the action of the air pressure in the inside of the shell 201, when the ball 205 at the oil inlet of the shell 201 moves, a strong suction is generated at the inlet of the shell 201, under the cooperation of the oil inlet pipe 202 and the temperature adjusting mechanism 3, a strong suction is generated at the oil inlet of the four-way pipe 316, the oil to be delivered can be sucked from the oil inlet of the four-way pipe 316, when the oil enters from the oil inlet of the four-way pipe 316, the oil will be directly divided under the action of the four-way pipe 316, at the same time, the main controller 320 is started and the threshold value is set, then the main controller 320 transmits the set temperature threshold value to the inside of the temperature controller 321 in the form of an electric signal, the temperature controller 321 processes the received electric signal and directly controls the electromagnetic heating controller 302 to start, the electromagnetic heating controller 302 controls all the electromagnetic coils 312 to generate a high-speed changing alternating magnetic field, the surface of each electromagnetic coil 312 corresponds to a metal heating pipe 310, which has a cutting alternating magnetic force line and generates an alternating current (i.e. eddy current), the eddy current causes the carrier to move at a high speed in the inside of the metal heating pipe 310, the carrier collides and rubs with each other to generate heat energy, thereby achieving heating of the outer wall of the corresponding L-shaped pipe 308, the oil passing through the inside of the L-shaped pipe 308 can be heated, then the heated oil flows out from the inside of the corresponding L-shaped pipe 308 to its outlet, when the heated oil is about to move to its outlet, under the cooperation of the hollow block 313, the connecting rod 314 and the auger blade 315, the speed of the heated oil moving out of the corresponding L-shaped pipe 308 is reduced, that is, the oil passing through the inside of the L-shaped pipe 308 can be fully heated, when the heated oil flows out from the outlet of the corresponding L-shaped pipe 308, it directly flows into the space composed of the electromagnetic shielding cover 305 and the L-shaped plate 306, when the space is full, under the action of the connecting pipe 303, the heated oil directly flows into the inside of the oil inlet pipe 202,When the heated oil liquid passes through the inside of the connecting pipe 303, the temperature sensor 304 detects the temperature of the oil liquid directly at this time, and directly transmits the detected temperature data to the inside of the main controller 320 in the form of an electrical signal for recording and display on the display screen of the main controller 320. Then the heated oil liquid entering the oil inlet pipe 202 directly passes through the corresponding installation hole 203 and enters the inside of the shell 201. When the plunger rod in the plunger pump body 1 is driven to return and enter the inside of the shell 201, under the action of the air pressure in the shell 201, the ball 205 at the oil inlet of the shell 201 is directly vertically reset to the initial position under the cooperation of the corresponding set of limiting blocks 206 and the spring 204 connected thereto, and is tightly fitted with the outlet of the corresponding installation hole 203. The ball 205 at the oil outlet of the shell 201 is directly vertically moved upward under the cooperation of the air pressure in the shell 201 and the corresponding set of limiting blocks 206. When the ball 205 at the oil outlet of the shell 201 moves, the moving ball 205 stretches the spring 204 connected thereto. At this time, the heated oil liquid coming out of the oil inlet of the shell 201 directly enters the inside of the buffer groove 207, then enters the installation hole 203 at the oil outlet of the shell 201, and finally is discharged from the outlet of the installation hole 203. When the plunger rod in the plunger pump body 1 continuously moves back and forth in the shell 201 on the pump head body 2, the plunger pump can transport the heated oil liquid, effectively avoiding the poor flow of the oil liquid in the plunger pump head body 2 due to low temperature of the transported oil, and the cavitation in the plunger pump head body 2. At the same time, the buffer groove 207 also reduces the pulsation of the oil liquid pressure, effectively improving the service life of the high-precision large-flow pump head body 2.

[0045] Among them, the plunger pump body 1 is mainly composed of a motor, an eccentric wheel, a plunger rod, a spring 204 and a pump shell. The plunger pump body 1 mainly changes the air pressure in the pump head body 2 by using the plunger rod.

[0046] Among them, the plunger pump body 1, the electromagnetic heating controller 302, the temperature sensor 304, the electromagnetic shield 305, the electromagnetic shield plate 309, the electromagnetic coil 312, the main controller 320 and the temperature controller 321 are all prior art, and will not be explained here.

[0047] Other technologies of the embodiment use prior art.

[0048] The application is described by preferred embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the application. The application is not limited by the specific embodiments disclosed herein, and other embodiments falling within the claims of the application are within the scope of the application.

Claims

1. A high-precision large-flow pump head comprising a plunger pump body (1), characterized in that: One side of the plunger pump body (1) is provided with a pump head body (2), one side of the pump head body (2) is provided with a temperature adjusting mechanism (3); The temperature adjusting mechanism (3) comprises a heating box (301), an electromagnetic heating controller (302) is installed on the top of the heating box (301), a connecting pipe (303) is installed at the opening of the top of the heating box (301), a temperature sensor (304) is installed on the front surface of the connecting pipe (303), an electromagnetic shielding cover (305) is installed in the heating box (301), an L-shaped plate (306) is fixed inside the electromagnetic shielding cover (305) near the top, three circular holes (307) are equidistantly arranged on the bottom of the L-shaped plate (306), an L-shaped pipe (308) is fixed in each circular hole (307), two electromagnetic shielding plates (309) are equidistantly fixed in the electromagnetic shielding cover (305), a metal heating pipe (310) is fixed on the outer wall of each L-shaped pipe (308), an insulating heat preservation sleeve (311) is fixed on the outer wall of each metal heating pipe (310), an electromagnetic coil (312) is movably sleeved on the outer wall of each insulating heat preservation sleeve (311), a four-way pipe (316) is installed between the oil inlet ends of the three L-shaped pipes (308), an installation plate (318) is installed on the front surface of the heating box (301), two installation grooves (319) are formed on the front surface of the installation plate (318), a main controller (320) is installed in one of the installation grooves (319), and a temperature controller (321) is installed in the other installation groove (319). A hollow block (313) is fixed in the oil outlet end of each L-shaped pipe (308), a connecting rod (314) is rotatably connected to the inner wall of each L-shaped pipe (308) through a bearing, and the bottom end of each connecting rod (314) is slidably embedded in the inner wall of each L-shaped pipe (308). A screw flight (315) is fixed on the outer surface of each connecting rod (314), and each screw flight (315) is movably sleeved in each L-shaped pipe (308). A cover plate (322) is rotatably connected to the front surface of the installation plate (318), a protection plate (323) is arranged on the top of the heating box (301), and two first L-shaped blocks (324) are fixed on the top of the protection plate (323).

2. The high-precision large-flow pump head of claim 1, wherein: The detection end of the temperature sensor (304) extends into the connecting pipe (303), the oil inlet end of each L-shaped pipe (308) movably penetrates the inner wall of the electromagnetic shielding cover (305), and the oil inlet end of each L-shaped pipe (308) movably penetrates the inner wall of the heating box (301).

3. The high-precision large-flow pump head according to claim 1, characterized in that: The two ends of each electromagnetic coil (312) movably penetrate the top of the inner wall of the electromagnetic shielding cover (305), the two ends of each electromagnetic coil (312) movably penetrate the bottom of the inner wall of the heating box (301), and the two ends of each electromagnetic coil (312) are electrically connected with the electromagnetic heating controller (302).

4. The high-precision large-flow pump head of claim 1, wherein: Two first L-shaped blocks (324) are mounted on the surface of the electromagnetic heating controller (302) by first screws, the bottom of the protection plate (323) is fixed with two second L-shaped blocks (325), two second L-shaped blocks (325) are mounted on the top of the heating box (301) by second screws, and the bottom of the heating box (301) is fixed with four L-shaped supports (317).

5. The high precision large flow pump head of claim 1, wherein: The pump head body (2) comprises a shell (201), the shell (201) is connected with the plunger pump body (1) through bolts, an oil inlet pipe (202) is installed on the oil inlet of the shell (201), and the oil inlet pipe (202) is connected with the oil outlet end of the connecting pipe (303).

6. The high-precision large-flow pump head according to claim 5, characterized in that: The inner wall of the shell (201) is provided with a buffer groove (207), the inner wall top of the buffer groove (207) and the inner wall of the shell (201) are both provided with mounting holes (203), and the inner wall of each mounting hole (203) is fixedly installed with a spring (204).

7. The high-precision large-flow pump head according to claim 6, characterized in that: The opposite ends of two springs (204) are fixedly installed with spherical bodies (205), one of the spherical bodies (205) is located in one of the mounting holes (203), and the other spherical body (205) is located between the inside of the shell (201) and the other mounting hole (203).

8. The high-precision large-flow pump head according to claim 7, characterized in that: The inside of one of the mounting holes (203) and the inside of the shell (201) are both fixedly installed with two limiting blocks (206), four limiting blocks (206) are divided into two groups, and each spherical body (205) is located between the opposite sides of each group of limiting blocks (206).

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