Continuous polyester fiber production equipment based on Internet of Things

Abstract

The invention belongs to the technical field of polyester fiber production, and particularly relates to continuous polyester fiber production equipment based on the Internet of Things, which comprises a polyester fiber production line, and the polyester fiber production line comprises a reaction furnace, a grain breaking machine, a screw extruder, a cooler, a winding machine and a spinning machine; the production flow of the polyester fiber production line comprises the following steps: S1, carrying out polymerization reaction through a reaction furnace to generate a polyester linear polymer; s2, crushing the raw particles into small particles through a particle crushing machine; s3, feeding the conical broken particles into a screw extruder, melting the conical broken particles into a polyester melt through heating and rotation of a screw, and stretching and extending the polyester melt into a fibrous substance under the action of a plurality of rotating shafts; the device solves the problem that the winding quality and the quality of polyester fibers are affected due to the fact that the tightness of the polyester fibers cannot be controlled in the winding process during current polyester fiber production.

Description

Technical Field

[0001] The invention belongs to the technical field of polyester fiber production, and specifically relates to a continuous polyester fiber production device based on the Internet of Things. Background Art

[0002] Polyester fiber has the advantages of high modulus, high strength, high elasticity, good shape retention and heat resistance. It has become the most widely used and consumed fiber variety. The production of polyester fiber includes polymerization reaction, cone pelletizing, melt spinning, cooling and solidification, winding, cutting and spinning; When winding, attention should be paid to the tension when winding the polyester fiber, otherwise it will cause loosening or breakage during the winding process, affecting the winding quality and the quality of the polyester fiber. Summary of the invention

[0003] The purpose of the present invention is to provide a continuous polyester fiber production equipment based on the Internet of Things to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a continuous polyester fiber production equipment based on the Internet of Things, including a polyester fiber production line, the polyester fiber production line including a reactor, a pelletizer, a screw extruder, a cooler, a winding machine and a spinning machine; the production process of the polyester fiber production line includes: step S1, a polymerization reaction is carried out through the reactor to generate a polyester linear polymer; step S2, the original pellets are broken into smaller particles by the pelletizer; step S3, the conical pellets enter the screw extruder, are melted into polyester melt by heating and rotation of the screw, and then are stretched and extended into a fibrous substance by the action of multiple rotating shafts; step S4, the polyester fiber after melt spinning is cooled by the cooler , forming solid fibers, and while cooling, the fibers are stretched and extended by the action of airflow and traction; step S5, the cooled and solidified polyester fibers are knotted into polyester fiber yarns by a winding machine and are sorted during winding; step S6, during the spinning process, the polyester fibers are processed into yarns, and are knotted, twisted and elongated to the desired yarn form by a spinning machine; the winding machine includes a base, a mounting plate, a motor, a reel, a tension chamber and a tension mechanism, the tension mechanism includes an Internet control system, the Internet control system is electrically connected to the motor, the mounting plate is fixedly installed above the base, the motor is fixedly installed on one side of the mounting plate, the reel is fixedly connected to the output end of the motor, and the tension chamber is fixedly installed above the base.

[0005] The present invention further illustrates that the tension mechanism includes a slide rail, a slider, a connecting shaft and a placement cavity, the inner wall bearing of the placement cavity is installed with the tension shaft, and a block is fixed to the bottom of the inner wall; the slider is slidably connected to the inner wall of the slide rail, the connecting shaft is fixedly installed above the slider, the placement cavity is fixedly installed at the upper end of the connecting shaft, and is located below the polyester fiber yarn, a hydraulic cavity is fixed on the left side of the inner wall of the tension cavity, a hydraulic plate is slidably connected to the inner wall of the hydraulic cavity, a connecting rod is installed on the right side bearing of the hydraulic plate, and a volute spring is arranged in the bearing, a sphere is fixed on the right end of the connecting rod, a magnetic ball is fixed on the left side of the connecting shaft, the sphere is magnetic, and the magnetic poles are the same as those of the magnetic ball, the left side of the hydraulic cavity is connected to the external hydraulic pump pipeline, the slider is connected to the spring on the right side of the inner wall of the slide rail, and the slide rail is inclined.

[0006] The present invention further illustrates that the Internet control system includes a power identification module, a network transmission module and a frequency control module; the power identification module is electrically connected to the motor, the network transmission module is electrically connected to the power identification module and the frequency control module respectively, the frequency control module is electrically connected to the external hydraulic pump, the power identification module is used to identify the operating power of the motor in real time, the network transmission module is used to transmit the operating power data of the motor to the frequency control module via network transmission, and the frequency control module is used to control the frequency of injection and discharge of the external hydraulic pump according to the operating power of the motor.

[0007] The present invention further describes that the right side of the hydraulic chamber is connected to the internal hose of the placement chamber, and a one-way valve is arranged in the hose, and the right side of the hydraulic chamber is connected to the external pipeline, and a one-way valve is arranged in the pipeline.

[0008] The present invention further describes that a sliding hole is provided inside the slide rail, and a limit rod is slidably connected in the sliding hole, the limit rod is spring-connected to the bottom of the inner wall of the sliding hole, the top of the limit rod is spherical, and the limit rod is located on the right side of the slider.

[0009] The present invention further illustrates that limit plates are fixed on the front and rear sides of the sphere, and the two limit plates are respectively located on the front and rear sides of the connecting shaft; a stirring plate is fixed on the outside of the connecting rod, a rotating rod is installed on the right bearing of the inner wall of the expansion chamber, a cross bar is fixed on the left end of the rotating rod, and the front and rear ends of the cross bar are respectively in contact with the top and bottom of the two limit plates, a fixed plate is fixed on the outside of the rotating rod, an electromagnetic plate is sleeved on the outside of the rotating rod, the right side of the electromagnetic plate is spring-connected to the fixed plate, an extrusion ball is fixed below the electromagnetic plate, a collision ball is fixed on the right side of the slider, and the extrusion ball contacts the collision ball after moving to the left.

[0010] The present invention further illustrates that the electromagnetic plate is electrically connected to an external hydraulic pump.

[0011] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the present invention drives the tension shaft to move to the right side through the placement chamber, and because the slide rail is inclined, the placement chamber gradually rises upward when moving to the right side, and the tension shaft bears upward force against the polyester fiber yarn, thereby increasing the tension in the winding process and ensuring the winding quality. Afterwards, the external hydraulic pump extracts the liquid again, and the tension shaft is reset, thereby loosening the polyester fiber yarn to avoid breakage caused by excessive tension. The degree of relaxation can improve the winding quality. At the same time, during the winding process, the polyester fiber yarn fits the surface of the tension shaft, driving the tension shaft to rotate, thereby scraping off the surface impurities of the polyester fiber yarn, and the baffle blocks the scraped impurities so that they fall into the placement chamber, and the impurities on the polyester fiber yarn are cleaned to avoid reducing the yarn quality during subsequent yarn formation. In addition, when the hydraulic plate slides left and right along the inner wall of the hydraulic cavity, the impurities scraped off in the placement cavity are extracted through the hose and discharged through the pipe, thereby cleaning the impurities and improving the production quality of polyester fiber. The slider is clamped by the limit rod, so that the tensioning time is increased when tension is applied to the polyester fiber, thereby further improving the winding quality. After that, the sphere moves away from the magnetic ball, and the magnetic repulsion between the two is reduced. After it is reduced to a level where the reaction force of the spring is greater than the magnetic repulsion, the slider is squeezed through the limit rod, thereby quickly resetting. The magnetic ball quickly moves to the left to reset and collides with the sphere, thereby generating vibration. The vibration can enable the impurities to be more smoothly extracted from the placement cavity through the hose, and can also be smoothly discharged through the hydraulic cavity, so that the impurity cleaning effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a plan view of the expansion chamber of the present invention; Figure 3 It is a schematic diagram of the internal structure of the expansion chamber of the present invention; Figure 4 It is a schematic diagram of the installation position of the limit rod of the present invention; Figure 5 It is a schematic diagram of the internal structure of the hydraulic chamber of the present invention; Figure 6 It is a schematic diagram of the operation mode of the rotating rod before and after the electromagnetic plate of the present invention moves; In the figure: 1. base; 2. fixed plate; 3. motor; 4. reel; 5. tension chamber; 51. slide rail; 511. limit rod; 52. slider; 521. collision ball; 53. connecting shaft; 531. magnetic ball; 54. placement chamber; 541. tension shaft; 542. block; 55. hydraulic chamber; 551. hydraulic plate; 552. connecting rod; 553. sphere; 554. limit plate; 555. stirring plate; 56. rotating rod; 561. cross bar; 562. fixed plate; 563. electromagnetic plate; 564. squeezing ball. DETAILED DESCRIPTION

[0013] The following is a further non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] See also Figure 1-6 The present invention provides a technical solution: a continuous polyester fiber production equipment based on the Internet of Things, including a polyester fiber production line, the polyester fiber production line includes a reactor, a pelletizer, a screw extruder, a cooler, a winder and a spinning machine; The production process of polyester fiber production line includes: Step S1, performing a polymerization reaction in a reaction furnace to generate a polyester linear polymer; Step S2: The original particles are broken into smaller particles by a particle crusher.

[0015] Step S3: The conical pellets enter the screw extruder, are melted into polyester melt by heating and the rotation of the screw, and then stretched and extended into fibrous material by the action of multiple rotating shafts; Step S4: the polyester fiber after melt spinning is cooled by a cooler to form solid fibers, and while cooling, the fibers are stretched and extended by airflow and traction; Step S5: the cooled and solidified polyester fiber is formed into polyester fiber yarn by a winding machine, and is finished during winding; Step S6: During the spinning process, the polyester fiber is processed into yarn and knotted, twisted and elongated into the desired yarn form through a spinning machine; The winding machine includes a base 1, a placement plate 2, a motor 3, a reel 4, an expansion chamber 5 and a expansion mechanism. The expansion mechanism includes an Internet control system. The Internet control system is electrically connected to the motor 3. The placement plate 2 is fixedly installed above the base 1, the motor 3 is fixedly installed on one side of the placement plate 2, the reel 4 is fixedly connected to the output end of the motor 3, and the expansion chamber 5 is fixedly installed above the base 1.

[0016] The tension mechanism includes a slide rail 51, a slider 52, a connecting shaft 53 and a placement cavity 54. The inner wall bearing of the placement cavity 54 is equipped with a tension shaft 541, and a stopper 542 is fixed at the bottom of the inner wall. The slider 52 is slidably connected to the inner wall of the slide rail 51, the connecting shaft 53 is fixedly installed above the slider 52, the placement chamber 54 is fixedly installed at the upper end of the connecting shaft 53 and is located below the polyester fiber yarn, a hydraulic chamber 55 is fixed to the left side of the inner wall of the tension chamber 5, a hydraulic plate 551 is slidably connected to the inner wall of the hydraulic chamber 55, a connecting rod 552 is installed on the right bearing of the hydraulic plate 551, and a volute spring is arranged in the bearing, a sphere 553 is fixed to the right end of the connecting rod 552, a magnetic ball 531 is fixed to the left side of the connecting shaft 53, the sphere 553 is magnetic, and the magnetic pole is the same as that of the magnetic ball 531, the left side of the hydraulic chamber 55 is connected to the external hydraulic pump pipeline, the slider 52 is connected to the spring on the right side of the inner wall of the slide rail 51, and the slide rail 51 is inclined; The polyester fiber yarn is wound by the winding machine, the motor 3 runs, driving the reel 4 to rotate, and the reel 4 winds the polyester fiber yarn. The external hydraulic pump injects liquid into the hydraulic chamber 55, and the hydraulic plate 551 is squeezed. The hydraulic plate 551 drives the ball 553 to move to the right through the connecting rod 552. The ball 553 and the magnetic ball 531 generate a mutually repelling magnetic repulsion, thereby driving the connecting shaft 53 to the right through the magnetic ball 531. The slider 52 slides to the right along the inner wall of the slide rail 51, and the spring is deformed by force. The placement chamber 54 drives the tension shaft 541 to move to the right. Since the slide rail 51 is inclined, the placement chamber 54 gradually rises upward when moving to the right. The tension shaft 541 supports the polyester fiber yarn upward, thereby increasing the tension in the winding process and ensuring the winding quality. After that, the external hydraulic pump extracts the liquid again, and the tension shaft 541 is reset, thereby loosening the polyester fiber yarn to avoid excessive tension and breakage. The degree of relaxation can improve the winding quality. At the same time, during the winding process, the polyester fiber yarn fits against the surface of the tension shaft 541, driving the tension shaft 541 to rotate, thereby scraping off impurities on the surface of the polyester fiber yarn. At the same time, the baffle 542 blocks the scraped impurities and allows them to fall into the placement chamber 54, thereby cleaning the impurities on the polyester fiber yarn to avoid reducing the quality of the yarn during subsequent yarn forming.

[0017] The Internet control system includes a power identification module, a network transmission module and a frequency control module; The power identification module is electrically connected to the motor 3, the network transmission module is electrically connected to the power identification module and the frequency control module respectively, the frequency control module is electrically connected to the external hydraulic pump, the power identification module is used to identify the operating power of the motor 3 in real time, the network transmission module is used to transmit the operating power data of the motor 3 to the frequency control module through network transmission, and the frequency control module is used to control the frequency of injection and discharge of the external hydraulic pump according to the operating power of the motor 3; The control method of the frequency control module is that the higher the operating power of the motor 3, the higher the frequency of the injection and exhaust of the external hydraulic pump, thereby increasing the frequency of the left and right movement of the tension shaft 541, and the higher the tension frequency of the polyester fiber yarn. On the one hand, the winding quality of the polyester fiber yarn is improved, and on the other hand, the tension frequency is reduced due to the slow winding speed, further avoiding the breakage of the polyester fiber yarn.

[0018] The right side of the hydraulic chamber 55 is connected to the internal hose of the placement chamber 54, and a one-way valve 1 is arranged in the hose. The right side of the hydraulic chamber 55 is connected to the external pipeline, and a one-way valve 2 is arranged in the pipeline. When the hydraulic plate 551 slides left and right along the inner wall of the hydraulic cavity 55, impurities scraped out of the placement cavity 54 are extracted through the hose and discharged through the pipeline, thereby playing a role in cleaning impurities and improving the production quality of polyester fibers.

[0019] A sliding hole is provided inside the slide rail 51, and a limit rod 511 is slidably connected in the sliding hole. The limit rod 511 is connected to a spring at the bottom of the inner wall of the sliding hole. The top of the limit rod 511 is spherical. The limit rod 511 is located on the right side of the slider 52. When the slider 52 slides to the right along the inner wall of the slide rail 51, the bottom of the slider 52 contacts the limit rod 511, the limit rod 511 is squeezed and immersed in the sliding hole, and the spring is deformed by force. After that, after the slider 52 slides over the limit rod 511, the spring generates a reaction force to push the limit rod 511 to reset. After resetting, the limit rod 511 clamps the slider 52, thereby increasing the tensioning time when tension is applied to the polyester fiber, thereby further improving the winding quality. After that, the ball 553 moves away from the magnetic ball 531, and the magnetic repulsion between the two is reduced. Until it is reduced to a level where the reaction force of the spring is greater than the magnetic repulsion, the slider 52 is squeezed through the limit rod 511, thereby quickly resetting. The magnetic ball 531 quickly moves to the left to reset and collides with the ball 553, thereby generating vibration. The vibration can make the impurities be more smoothly extracted from the placement cavity 54 through the hose, and the impurities can be smoothly discharged through the hydraulic cavity 55, and the impurity cleaning effect is better.

[0020] Limiting plates 554 are fixed on both the front and rear sides of the sphere 553, and the two limiting plates 554 are respectively located on the front and rear sides of the connecting shaft 53; A stirring blade 555 is fixed to the outside of the connecting rod 552, a rotating rod 56 is installed on the right bearing of the inner wall of the tension chamber 5, a cross bar 561 is fixed to the left end of the rotating rod 56, and the front and rear ends of the cross bar 561 are respectively in contact with the upper and lower ends of the two limit plates 554, a fixing plate 562 is fixed to the outside of the rotating rod 56, an electromagnetic plate 563 is sleeved on the outside of the rotating rod 56, the right side of the electromagnetic plate 563 is connected to the fixing plate 562 by a spring, a squeezing ball 564 is fixed below the electromagnetic plate 563, a collision ball 521 is fixed to the right side of the slider 52, and the squeezing ball 564 contacts the collision ball 521 after moving to the left; After the electromagnetic plate 563 is started, magnetism is generated, and a magnetic attraction force is generated between the magnetic pole and the ball 553, so that the electromagnetic plate 563 moves to the left along the rotating rod 56, and the electromagnetic plate 563 pulls the spring to deform under force, and the electromagnetic plate 563 drives the squeezing ball 564 to move to the left. Then, when the slider 52 moves to the right, it drives the collision ball 521 to move to the right and contact with the squeezing ball 564, pushing the squeezing ball 564 to rotate around the center of the rotating rod 56. At the same time, due to the fixed connection of the spring, the electromagnetic plate 563 is fixed, thereby driving the rotating rod 56. The rod 56 rotates, and the rotating rod 56 drives the cross bar 561 to rotate. The front and rear ends of the cross bar 561 push the limit plate 554 to rotate. The limit plate 554 drives the connecting rod 552 to rotate through the ball 553. The connecting rod 552 drives the stirring plate 555 to rotate, which can stir the extracted impurities and break them up, so that they can be discharged from the pipeline more smoothly and avoid pipeline blockage. When the electromagnetic plate 563 is closed, the spring generates a reaction force to reset the electromagnetic plate 563, and the scroll spring resets, thereby resetting the ball 553.

[0021] The electromagnetic plate 563 is electrically connected to the external hydraulic pump; When the extraction frequency of the external hydraulic pump reaches the maximum, the electromagnetic plate 563 is opened by electric drive. At this time, the frequency of extracting impurities reaches the maximum. In order to avoid pipeline blockage, the impurities are stirred to ensure that the impurities can be discharged smoothly through the pipeline. On the other hand, when the frequency of extracting impurities is low, the impurities are discharged smoothly without stirring the impurities, thereby ensuring the service life of the structure.

[0022] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A continuous polyester fiber production equipment based on the Internet of Things, including a polyester fiber production line, characterized in that: The polyester fiber production line includes a reaction furnace, a pelletizer, a screw extruder, a cooler, a winding machine and a spinning machine; The production process of the polyester fiber production line includes: Step S1, performing a polymerization reaction in a reaction furnace to generate a polyester linear polymer; Step S2: the original grains are broken into smaller grains by a grain breaking machine; Step S3: The conical pellets enter the screw extruder, are melted into polyester melt by heating and the rotation of the screw, and then stretched and extended into fibrous material by the action of multiple rotating shafts; Step S4: the polyester fiber after melt spinning is cooled by a cooler to form solid fibers, and while cooling, the fibers are stretched and extended by airflow and traction; Step S5: the cooled and solidified polyester fiber is formed into polyester fiber yarn by a winding machine, and is finished during winding; Step S6: During the spinning process, the polyester fiber is processed into yarn and knotted, twisted and elongated into the desired yarn form through a spinning machine; The winding machine comprises a base (1), a placement plate (2), a motor (3), a reel (4), a tension chamber (5) and a tension mechanism, wherein the tension mechanism comprises an Internet control system, wherein the Internet control system is electrically connected to the motor (3), the placement plate (2) is fixedly mounted above the base (1), the motor (3) is fixedly mounted on one side of the placement plate (2), the reel (4) is fixedly connected to the output end of the motor (3), and the tension chamber (5) is fixedly mounted above the base (1).

2. The continuous polyester fiber production equipment based on the Internet of Things according to claim 1, characterized in that: The tension mechanism comprises a slide rail (51), a slider (52), a connecting shaft (53) and a placement cavity (54); the inner wall bearing of the placement cavity (54) is equipped with a tension shaft (541), and a stopper (542) is fixed to the bottom of the inner wall; The slider (52) is slidably connected to the inner wall of the slide rail (51), the connecting shaft (53) is fixedly installed above the slider (52), the placement chamber (54) is fixedly installed at the upper end of the connecting shaft (53) and is located below the polyester fiber yarn, a hydraulic chamber (55) is fixedly installed on the left side of the inner wall of the tension chamber (5), a hydraulic plate (551) is slidably connected to the inner wall of the hydraulic chamber (55), and a connecting rod (551) is installed on the right side bearing of the hydraulic plate (551) 552), and a scroll spring is arranged in the bearing, a sphere (553) is fixed to the right end of the connecting rod (552), a magnetic ball (531) is fixed to the left side of the connecting shaft (53), the sphere (553) is magnetic, and the magnetic pole is the same as the magnetic pole of the magnetic ball (531), the left side of the hydraulic chamber (55) is connected to the external hydraulic pump pipeline, the slider (52) is connected to the inner wall right side of the slide rail (51) by a spring, and the slide rail (51) is inclined.

3. The continuous polyester fiber production equipment based on the Internet of Things according to claim 2, characterized in that: The Internet control system includes a power identification module, a network transmission module and a frequency control module; The power identification module is electrically connected to the motor (3), the network transmission module is electrically connected to the power identification module and the frequency control module respectively, the frequency control module is electrically connected to the external hydraulic pump, the power identification module is used to identify the operating power of the motor (3) in real time, the network transmission module is used to transmit the operating power data of the motor (3) to the frequency control module via network transmission, and the frequency control module is used to control the frequency of injection and discharge of the external hydraulic pump according to the operating power of the motor (3).

4. The continuous polyester fiber production equipment based on the Internet of Things according to claim 3 is characterized in that: The right side of the hydraulic chamber (55) is connected to the internal hose of the placement chamber (54), and a first check valve is arranged in the hose. The right side of the hydraulic chamber (55) is connected to an external pipeline, and a second check valve is arranged in the pipeline.

5. The continuous polyester fiber production equipment based on the Internet of Things according to claim 4, characterized in that: A sliding hole is provided inside the slide rail (51), and a limit rod (511) is slidably connected inside the slide hole. The limit rod (511) is spring-connected to the bottom of the inner wall of the slide hole. The top end of the limit rod (511) is spherical. The limit rod (511) is located on the right side of the slide block (52).

6. The continuous polyester fiber production equipment based on the Internet of Things according to claim 5, characterized in that: Limiting plates (554) are fixed on both the front and rear sides of the sphere (553), and the two limiting plates (554) are respectively located on the front and rear sides of the connecting shaft (53); A stirring blade (555) is fixed to the outside of the connecting rod (552); a rotating rod (56) is installed on the right bearing of the inner wall of the expansion chamber (5); a cross bar (561) is fixed to the left end of the rotating rod (56); and the front and rear ends of the cross bar (561) are respectively in contact with the upper and lower parts of the two limit plates (554); a fixing plate (562) is fixed to the outside of the rotating rod (56); an electromagnetic plate (563) is sleeved on the outside of the rotating rod (56); the right side of the electromagnetic plate (563) is connected to the fixing plate (562) by a spring; a squeezing ball (564) is fixed below the electromagnetic plate (563); a collision ball (521) is fixed to the right side of the slider (52); and the squeezing ball (564) contacts the collision ball (521) after moving to the left.

7. The continuous polyester fiber production equipment based on the Internet of Things according to claim 6, characterized in that: The electromagnetic plate (563) is electrically connected to an external hydraulic pump.

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