An operating test bench for a plunger pump of a fracturing truck

Abstract

The present invention relates to the technical field of fracturing truck plunger pump testing, and discloses an operating test bench for a fracturing truck plunger pump, which includes a workbench. A groove for placing the plunger pump is formed on the surface of the workbench. A plunger pump driving device, a plunger pump fixing device, and a plunger pump testing device are respectively arranged around the groove on the workbench. The present invention has the following advantages and effects: It has the effects of complete testing functions and high versatility.

Description

Technical Field

[0001] The present invention relates to the technical field of fracturing truck plunger pump testing, and particularly relates to an operation test bench for a fracturing truck plunger pump. Background Art

[0002] A fracturing truck is a special vehicle used to inject high-pressure and large-displacement fracturing fluid into a well to fracture the formation and squeeze proppants into the fractures. It mainly consists of a carrier chassis, a vehicle-mounted engine, a vehicle-mounted transmission box, a plunger pump, a pipe manifold system, a lubrication system, an electrical system, a pneumatic system, and a hydraulic system, etc. Among them, the plunger pump (also known as a fracturing pump) is used to convey fracturing fluid to the fracturing well at high pressure. Therefore, the performance of the plunger pump is the main criterion for measuring the efficiency of the fracturing truck.

[0003] At present, during the factory process of the plunger pump, in order to verify the performance of the plunger pump at different speeds, it is necessary to test the plunger pump by running it on a test bench. However, the existing plunger pump test bench has a single test function and can only simply run the plunger pump by using an electric motor and belt drive to detect whether there are abnormal problems such as abnormal noises during the operation of the plunger pump. Therefore, it cannot measure the actual effective performance parameters such as the displacement and pressure of the plunger pump. Moreover, the versatility of this test bench is poor, and the drive end of the plunger pump on the test bench cannot be adaptively adjusted and adapted according to different models and sizes of plunger pumps. Summary of the Invention

[0004] The purpose of the present invention is to provide an operation test bench for a fracturing truck plunger pump, which has the effects of complete test functions and high versatility.

[0005] The above technical object of the present invention is achieved through the following technical solutions: An operation test bench for a plunger pump of a fracturing truck, comprising a workbench, on the surface of which a groove for placing the plunger pump is provided. The workbench is respectively provided with a plunger pump driving device, a plunger pump fixing device, and a plunger pump testing device around the groove. The plunger pump driving device includes a pair of motors I installed on both sides of the workbench, a rotating hollow disk I rotating on the output shaft of the motor I, a support frame fixed to the workbench and for the rotating hollow disk I to rotate and be installed thereon, a driving mechanism I for driving the rotating hollow disk I to rotate, a driving gear I fixed to the output shaft of the motor I and located inside the rotating hollow disk I, a pair of long strip sliding holes respectively opened on both sides of the rotating hollow disk I and aligned with each other, a pair of sliders I respectively sliding in the two long strip sliding holes, a rotating sleeve I with both ends respectively rotating through the two sliders I, a driven gear I fixedly installed on the rotating sleeve I and located inside the rotating hollow disk I, a connecting rod I with one end hinged to the output shaft of the motor I and located on one side of the driving gear I, a connecting rod II with one end hinged to the rotating sleeve I and located on the other side of the driving gear I, a driven gear II rotating between the other ends of the connecting rod I and the connecting rod II, a driving mechanism II provided on the rotating hollow disk I and for driving the connecting rod I to flip. The driven gear II meshes with both the driving gear I and the driven gear I and is located between them. The long strip sliding holes are perpendicular to the axis of the rotating hollow disk I. A transmission shaft is slidably inserted into the rotating sleeve I, and the transmission shaft is connected to the rotating sleeve I through a sliding key. The plunger pump fixing device includes a pair of flipping arms that can be flipped on the side walls of both sides of the groove, a pressing rod with both ends respectively slidably connected to the flipping arms and capable of pressing on the upper part of the plunger pump, a driving mechanism III for driving the two flipping arms to flip, a driving mechanism IV for driving the pressing rod to slide on the flipping arms, and an automatic telescoping mechanism provided on the rotating hollow disks I on both sides of the groove and capable of telescopically clamping both sides of the plunger pump. The plunger pump testing device includes a water tank and an oil tank respectively fixed to the bottom of the workbench, a pair of rigid pipes I fixed to the workbench and respectively connecting the input end and the output end of the water tank, a pair of rigid pipes II fixed to the workbench and respectively connecting the input end and the output end of the oil tank, a throttle valve, a water pressure gauge, and a flow meter respectively installed on the rigid pipes I, an oil pump and a thermometer respectively installed on the rigid pipes II, a flexible pipe I connecting the rigid pipe I and the suction port or the discharge port of the plunger pump, and a flexible pipe II connecting the rigid pipe II and the lubricating oil input end or the output end of the plunger pump.

[0006] By adopting the above technical solution, when it is necessary to test the plunger pump, first use equipment such as a crane to place the plunger pump in the groove of the workbench; then start the driving mechanism three to drive the turning arm to turn, so that the pressing rod presses on the upper part of the plunger pump. During this period, the driving member four can be started to drive the adjustment of the position of the pressing rod relative to the turning arm to adapt to plunger pumps of different heights; then start the driving mechanism one to drive the rotation of the rotating hollow disk one. When the long strip sliding hole is aligned with the driving shaft of the plunger pump, stop the driving mechanism one and start the driving mechanism two to drive the first connecting rod to turn relative to the rotating hollow disk one. Since one end of the first connecting rod is hinged to the second connecting rod and one end of the second connecting rod is hinged to the first slider, when the first connecting rod turns, the first slider will move along the long strip sliding hole so that the rotating sleeve one between the two first sliders is concentric with the driving shaft of the plunger pump; then pull out the transmission shaft sliding in the rotating sleeve one and connect one end of the transmission shaft and one end of the driving shaft of the plunger pump through a coupling. Since the first driving gear, the first driven gear and the second driven gear are respectively located at the respective rotating hinge points of the rotating connecting rod one and the connecting rod two and are meshed with each other, the output shaft of the first motor can sequentially transmit power to the transmission shaft and the driving shaft through the first driving gear, the second driven gear and the first driven gear, thereby driving the plunger pump to operate; then start the automatic telescopic mechanism on the rotating hollow disk one to move closer to both sides of the plunger pump. After the two sides of the plunger pump are clamped and fixed, connect the two first hoses on the workbench to the suction port and the discharge port of the plunger pump respectively, and connect the two second hoses to the lubricating oil input end and the output end of the plunger pump; finally, start the first motor and the oil pump to operate the plunger pump for testing. The actual displacement and pressure of the plunger pump can be obtained through the water pressure gauge and the flow meter on the first hard pipe, and the lubricating oil temperature can be detected through the thermometer on the second hard pipe to prevent the lubricating oil from overheating and affecting the stable operation of the plunger pump. At the same time, it is also possible to observe whether there are abnormal noises or other problems during the operation of the plunger pump; the symmetrically arranged rotating hollow disk one and the first slider and other structures on both sides of the groove of the plunger pump driving device can also ensure that the plunger pump driving device can adapt to and operate the plunger pump with the driving shafts not on the same side, thereby improving the versatility of the device.

[0007] The further setting of the present invention is that: the driving mechanism one includes a gear ring fixedly arranged on the outer ring of the rotating hollow disk one, a first rotating shaft rotatably installed on the workbench, a pair of second driving gears fixedly installed on the rotating shaft and respectively meshed with the gear rings on the two rotating hollow disks one, a first worm wheel fixedly installed at one end of the first rotating shaft, and a first worm rotatably installed on the workbench and meshed with the first worm wheel. One end of the first worm is provided with a first hand crank.

[0008] By adopting the above technical solution, when it is necessary to drive the rotation of the first rotating hollow disc, first manually rotate the first hand crank, so that the first worm rotates, and the first worm meshes with and drives the first worm gear. Then, the first worm gear will drive the first rotating shaft to rotate, so that the two driving gears II on the first rotating shaft respectively mesh with and drive the toothed rings on the two first rotating hollow discs. Finally, the first rotating hollow disc will rotate with the toothed ring, so that the long strip sliding hole on the first rotating hollow disc is aligned with the driving shaft of the plunger pump.

[0009] The further setting of the present invention is that: the second driving mechanism includes a second rotating sleeve fixed to the first connecting rod and rotatably passing through one side of the first rotating hollow disc, a second worm gear fixed to the second rotating sleeve and located on one side of the first rotating hollow disc, and a second worm rotatably installed on one side of the first rotating hollow disc and meshing with the second worm gear. The second rotating sleeve is rotatably connected to the output shaft of the first motor, and a first knob is installed at one end of the second worm.

[0010] By adopting the above technical solution, when it is necessary to drive the first connecting rod to flip, first manually rotate the first knob, so that the second worm meshes with and drives the second worm gear. Then, the second worm gear will drive the second rotating sleeve to rotate relative to the first rotating hollow disc. Since the second rotating sleeve is rotatably connected to the output shaft of the first motor, the first connecting rod will flip around the output shaft of the first motor, thereby indirectly adjusting the relative position between the first slider and the long strip sliding hole to facilitate aligning the transmission shaft connecting the first rotating sleeve and the driving shaft of the plunger pump.

[0011] The further setting of the present invention is that: the third driving mechanism includes a second rotating shaft rotatably installed in the groove, and a second motor fixed to the workbench and driving the second rotating shaft to rotate. One end of the flipping arm is fixedly connected to the second rotating shaft, and a worm and worm gear reducer is installed between the second motor and one end of the second rotating shaft.

[0012] By adopting the above technical solution, when it is necessary to drive the flipping arm to flip, start the second motor to drive the second rotating shaft to rotate, and the two flipping arms on the second rotating shaft can be driven to flip synchronously. Among them, the worm and worm gear reduction motor can reduce the speed of the second motor and increase the torque, and can also be self-locked before and after the second motor is started to ensure that the pressure rod between the flipping arms stably presses the plunger pump.

[0013] The further setting of the present invention is that: the fourth driving mechanism includes second sliders fixed to both ends of the pressure rod and hollow inside, sliding grooves opened on the flipping arm for the second sliders to slide, a first lead screw fixed in the sliding groove and parallel to the sliding groove, a first nut rotatably installed in the second slider and threadedly connected to the first lead screw, a third worm gear rotatably installed in the second slider and fixedly installed on the first nut, a third rotating shaft rotatably passing through the two second sliders and the middle pressure rod, and a pair of third worms fixed to the third rotating shaft and respectively meshing with the third worm gears in the two second sliders. One end of the third rotating shaft passes through the second slider and is fixedly installed with a second hand crank.

[0014] By adopting the above technical solution, when it is necessary to drive and adjust the relative position of the pressure rod between the two flipping arms, first manually rotate the second hand rocker, so that the third rotating shaft and the third worm rotate. Then, the third worm will meshingly drive the third worm wheels at both ends of the pressure rod, so that the two third worm wheels respectively drive the first nuts in the two second sliders to rotate. Since the first nut is threadedly connected to the first lead screw, and the lead screw is parallel to the chute, finally, under the rotation of the first nut, the two second sliders will slide along the chute on the flipping arm and drive the middle pressure rod to move relative to the two flipping arms.

[0015] The further setting of the present invention is: the automatic telescopic mechanism includes two link rods three with one end hinged to one side of the first slider, a sliding sleeve sleeved on the transmission shaft, a link rod four with both ends respectively hinged to the sliding sleeve and one end of the link rod three, a driving component for driving the two link rods three to approach or move away from each other for flipping, a clamping ring that can telescopically move at the front end of the sliding sleeve, and an adjusting component for telescopically adjusting the distance between the clamping ring and the sliding sleeve. The two link rods three respectively flip between both sides of the transmission shaft and both sides of the long strip sliding hole. The clamping ring and the transmission shaft are coaxial, and the diameter of the clamping ring is larger than the diameter of the transmission shaft.

[0016] By adopting the above technical solution, when it is necessary to clamp both sides of the plunger pump, first start the driving component to drive the two link rods three to approach and flip towards each other, so that the included angle between the two link rods three is reduced. Then, the link rod four respectively hinged to the link rod three will also reduce the included angle and simultaneously push the sliding sleeve to move relative to the transmission shaft. Then, the telescopically movable clamping ring at the front end of the sliding sleeve will gradually approach the side of the plunger pump. Since the above structure is symmetrically arranged on both sides of the groove, both sides of the plunger pump will be clamped and fixed in the middle by the two clamping rings. Also, because the clamping ring and the transmission shaft are coaxial, and the diameter of the clamping ring is larger than the diameter of the transmission shaft, the clamping ring will not only not affect the connection between the transmission shaft and the driving shaft of the plunger pump, but also be able to stably clamp and fix the periphery of the driving shaft of the plunger pump to ensure the smooth and safe transmission of the transmission shaft. Among them, the adjusting component can adjust the distance between the clamping ring and the sliding sleeve to ensure that the clamping ring can extend sufficiently to clamp plunger pumps of different widths.

[0017] The further setting of the present invention is: the driving component includes a pair of bevel gears one respectively fixedly installed at the flipping centers of the two link rods three, a rotating shaft four rotatably installed on one side of the first slider and parallel to the long strip sliding hole, a bevel gear two fixedly installed on the rotating shaft four and respectively meshing with the two bevel gears one, a rotating sleeve three rotatably installed on the rotating hollow disk one and for the rotating shaft four to slide through, a worm wheel four fixedly installed on the rotating sleeve three, a worm four rotatably installed on the rotating hollow disk one and meshing with the worm wheel four, and a motor three fixedly installed on the rotating hollow disk one and connected to drive the worm four. The rotating shaft four and the rotating sleeve three are connected by a sliding key, and the rotating sleeve three is located at the end of the long strip sliding hole far from the center of the rotating hollow disk one.

[0018] By adopting the above technical solution, when it is necessary to drive the two-link triple flip, first start the motor three to drive the worm four, so that the worm four meshes and drives the worm wheel four to rotate. Then the worm wheel four will drive the rotating sleeve three to rotate. Since the rotating shaft four is slidably inserted and key-connected between them, the rotating shaft four will rotate with the rotating sleeve three. Then the bevel gear two at the front end of the rotating shaft four meshes and drives the bevel gear one, so that the link three connected to the flip center by the bevel gear one flips. Also, because the bevel gear ones of the upper and lower link threes are respectively meshed on both sides of the bevel gear two, the two link threes will flip in the direction of approaching or separating from each other, and thus the included angle between the two link threes will be reduced or enlarged. The key connection between the rotating shaft four and the rotating sleeve three can effectively and stably transmit power while not affecting the movement of the driving mechanism two to drive the adjusting slider one.

[0019] The further setting of the present invention is: the adjusting assembly includes a rotating hollow disk two rotating at the front end of the sliding sleeve, a central gear fixedly installed on the sliding sleeve and located at the center inside the rotating hollow disk two, a pair of nuts two rotating inside the rotating hollow disk two and located on both sides of the central gear respectively, a planetary gear fixedly installed on the nut two and meshing with the central gear, and a pair of screw rods two vertically passing through the rotating hollow disk two and respectively threadedly connected to the two nuts two. One end of each of the two screw rods two is vertically and fixedly connected to a clamping ring.

[0020] By adopting the above technical solution, when it is necessary to adjust the distance between the sliding sleeve and the clamping ring, the rotating hollow disk two at the front end of the sliding sleeve can be directly rotated manually, so that the two planetary gears inside the rotating hollow disk two rotate around the middle central gear. Since the central gear is fixed on the sliding sleeve, the two planetary gears will rotate around the central gear and can also rotate themselves to drive the nuts two to rotate. Then the two screw rods two respectively threadedly connected to the two nuts two will relatively expand and contract to make the pressing ring move away from or close to the sliding sleeve during the rotation of the nuts two, and thus achieve the effect of adjusting the distance between the sliding sleeve and the clamping ring.

[0021] The further setting of the present invention is: a limiting hole is provided on the inner wall of the sliding sleeve, a limiting post is slidably inserted inside the limiting hole, a spring is provided between the limiting post and the bottom of the limiting hole, one end of the limiting post is a hemispherical surface and extends out of the limiting hole, a circular arc groove for fitting the hemispherical surface of the limiting post is provided on the transmission shaft, a positioning retaining ring is fixedly provided on the transmission shaft, the sliding sleeve moves between the positioning retaining ring and the front end of the transmission shaft, and when the sliding sleeve contacts the positioning retaining ring, the top end of the limiting post just fits into the circular arc groove.

[0022] By adopting the above technical solution, when the sliding sleeve moves toward the side of the plunger pump, it first abuts against the side of the positioning retaining ring, so that the limiting post on the inner wall of the sliding sleeve aligns with the annular arc groove on the drive shaft. Then, the spring in the limiting hole pushes one end of the limiting post into the annular arc groove, allowing the sliding sleeve to drive the drive shaft toward the drive shaft of the plunger pump, thereby quickly and conveniently installing the coupling between the drive shaft and the drive shaft. When one end of the drive shaft fully contacts the drive shaft, the other end pushes into the limiting post in the annular arc groove and is pulled out by the still-moving sliding sleeve, thereby releasing the lock between the drive shaft and the sliding sleeve, allowing the sliding sleeve to push the clamping ring to clamp the plunger pump. When the sliding sleeve moves away from the plunger pump, the sliding sleeve returns to contact the retaining ring on the drive shaft, pushing the drive shaft away from the drive shaft of the plunger pump while restoring the connection between the limiting post and the annular arc groove, thereby facilitating the preparation of subsequent plunger pump operations.

[0023] The beneficial effects of the present invention are:

[0024] Through the structure of the adjustable rotatable hollow disk and the adjustable movable slider in the plunger pump drive device, not only can the position of the drive shaft in the drive device be adjusted to quickly align the drive shafts connected to different plunger pumps, but also, in conjunction with the transmission structure between the gear and the connecting rod in the rotating hollow disk, the power of the motor can be effectively transmitted to the drive shaft, thereby achieving the effect that the plunger pump drive device can quickly adapt to and drive plunger pumps of different sizes and models.

[0025] Through the structures of the flip arm, pressure rod and automatic telescopic assembly in the plunger pump fixing device, not only the effect of automatically pressing and clamping the plunger pump is achieved, but the driving mechanism 4 can also adjust the relative position between the pressure rod and the flip arm, so that the pressure rod can adapt to and stably press plunger pumps of different heights, thereby improving the versatility of the plunger pump fixing device.

[0026] Through the structures such as the connecting rod and the sliding sleeve in the automatic telescopic mechanism, not only can it follow the movement and adjustment of the slider and the transmission shaft to clamp and fix the safety parts on both sides of different plunger pumps, but the retractable clamping ring at the front end of the sliding sleeve can also adapt to and fix plunger pumps of different widths while stably clamping and fixing the periphery of the plunger pump drive shaft, thereby ensuring smooth transmission between the transmission shaft and the drive shaft.

[0027] Through the various pipes and detection instruments of the plunger pump test device, not only can the displacement and pressure of the plunger pump during operation be effectively detected to increase the testing function of the test bench, but also the temperature of the plunger pump lubricating oil can be monitored at any time to ensure the safe operation of the plunger pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0029] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0030] Figure 2 is a schematic structure diagram of the plunger pump driving device of the present invention;

[0031] Figure 3 is a schematic structure diagram of the plunger pump fixing device of the present invention;

[0032] Figure 4 is a schematic structure diagram of the automatic telescoping mechanism of the present invention;

[0033] Figure 5 is a schematic diagram of the connection relationship between the sliding sleeve and the transmission shaft of the present invention;

[0034] Figure 6 is Figure 3 an enlarged view of part A of

[0035] In the figure, 1 is a workbench; 11 is a groove; 2 is a plunger pump driving device; 21 is a first motor; 22 is a first rotating hollow disc; 221 is a long strip sliding hole; 222 is a first slider; 23 is a support frame; 24 is a first driving mechanism; 241 is a gear ring; 242 is a first rotating shaft; 243 is a second driving gear; 244 is a first worm gear; 245 is a first worm; 246 is a first hand crank; 25 is a first driving gear; 251 is a first connecting rod; 26 is a first rotating sleeve; 261 is a first driven gear; 262 is a second connecting rod; 27 is a second driven gear; 28 is a second driving mechanism; 281 is a second rotating sleeve; 282 is a second worm gear; 283 is a second worm; 284 is a first knob; 29 is a transmission shaft; 291 is an annular arc groove; 292 is a retaining ring; 3 is a plunger pump fixing device; 31 is a turning arm; 32 is a pressure bar; 33 is a third driving mechanism; 331 is a second rotating shaft; 332 is a second motor; 333 is a worm and gear reducer; 34 is a fourth driving mechanism; 341 is a second slider; 342 is a chute; 343 is a first lead screw; 344 is a first nut; 345 is a third worm gear; 346 is a third rotating shaft; 347 is a third worm; 348 is a second hand rocker; 35 is an automatic telescoping mechanism; 351 is a third connecting rod; 352 is a sliding sleeve; 352a is a limiting hole; 352b is a limiting post; 353 is a fourth connecting rod; 354 is a clamping ring; 4 is a plunger pump testing device; 41 is a water tank; 42 is an oil tank; 43 is a first rigid pipe; 431 is a throttle valve; 432 is a pressure gauge; 433 is a flow meter; 44 is a second rigid pipe; 441 is an oil pump; 442 is a thermometer; 45 is a first flexible pipe; 46 is a second flexible pipe; 5 is a driving assembly; 51 is a first bevel gear; 52 is a fourth rotating shaft; 53 is a second bevel gear; 54 is a third rotating sleeve; 55 is a fourth worm gear; 56 is a fourth worm; 57 is a third motor; 6 is an adjusting assembly; 61 is a second rotating hollow disc; 62 is a central gear; 63 is a second nut; 64 is a planetary gear; 65 is a second lead screw. Specific Embodiment

[0036] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0037] Embodiment: An operating test bench for a fracturing truck plunger pump, as Figures 1-3As shown in the figure, it includes a workbench 1. A groove 11 for placing a plunger pump is formed on the surface of the workbench 1. A plunger pump driving device 2, a plunger pump fixing device 3, and a plunger pump testing device 4 are respectively arranged around the groove 11 on the workbench 1. The plunger pump driving device 2 includes a pair of motors 21 installed on both sides of the workbench 1, a rotating hollow disk 22 rotating on the output shaft of the motor 21, a support frame 23 fixed on the workbench 1 for the rotating hollow disk 22 to rotate and install, a driving mechanism 24 for driving the rotating hollow disk 22 to rotate, a driving gear 25 fixed on the output shaft of the motor 21 and located inside the rotating hollow disk 22, a pair of long strip sliding holes 221 respectively opened on both sides of the rotating hollow disk 22 and aligned with each other, a pair of sliders 222 respectively sliding in the two long strip sliding holes 221, a rotating sleeve 26 with both ends respectively rotating through the two sliders 222, a driven gear 261 fixedly installed on the rotating sleeve 26 and located inside the rotating hollow disk 22, a connecting rod 251 with one end hinged to the output shaft of the motor 21 and located on one side of the driving gear 25, a connecting rod 262 with one end hinged to the rotating sleeve 26 and located on the other side of the driving gear 25, a driven gear 27 rotating between the other ends of the connecting rod 251 and the connecting rod 262, a driving mechanism 28 arranged on the rotating hollow disk 22 for driving the connecting rod 251 to flip, the driven gear 27 meshes with the driving gear 25 and the driven gear 261 respectively and is located between them, the long strip sliding holes 221 are perpendicular to the axis of the rotating hollow disk 22, a transmission shaft 29 is slidably inserted into the rotating sleeve 26, and the transmission shaft 29 is connected to the rotating sleeve 26 through a sliding key; the plunger pump fixing device 3 includes a pair of flipping arms 31 that can be flipped on the side walls of both sides of the groove 11, a pressing rod 32 with both ends respectively slidably connected to the flipping arms 31 and capable of pressing on the upper part of the plunger pump, a driving mechanism 33 for driving the two flipping arms 31 to flip, a driving mechanism 34 for driving the pressing rod 32 to slide on the flipping arms 31, and an automatic telescopic mechanism 35 arranged on the rotating hollow disks 22 on both sides of the groove 11 and capable of telescopically clamping both sides of the plunger pump; the plunger pump testing device 4 includes a water tank 41 and an oil tank 42 respectively fixed at the bottom of the workbench 1, a pair of rigid pipes 43 fixed on the workbench 1 and respectively connected to the input end and the output end of the water tank 41, a pair of rigid pipes 44 fixed on the workbench 1 and respectively connected to the input end and the output end of the oil tank 42, a throttle valve 431, a water pressure gauge 432, and a flow meter 433 respectively installed on the rigid pipe 43, an oil pump 441 and a thermometer 442 respectively installed on the rigid pipe 44, a flexible pipe 45 connecting the rigid pipe 43 and the suction port or the discharge port of the plunger pump, and a flexible pipe 46 connecting the rigid pipe 44 and the lubricating oil input end or the output end of the plunger pump.

[0038] When a plunger pump needs to be tested, first use equipment such as a crane to place the plunger pump in the groove 11 of the workbench 1; then start the drive mechanism three 33 to drive the flipping arm 31 to flip, so that the pressure rod 32 presses on the upper part of the plunger pump. During this period, the drive member four can be started to drive the adjustment of the position of the pressure rod 32 relative to the flipping arm 31 to adapt to plunger pumps of different heights; then start the drive mechanism one 24 to drive the rotating hollow disk one 22 to rotate. When the long strip sliding hole 221 is aligned with the plunger pump drive shaft, stop the drive mechanism one 24, and start the drive mechanism two 28 to drive the connecting rod one 251 to flip relative to the rotating hollow disk one 22. Since one end of the connecting rod one 251 is hinged to the connecting rod two 262 and one end of the connecting rod two 262 is hinged to the slider one 222, when the connecting rod one 251 flips, the slider one 222 will move along the long strip sliding hole 221 so that the rotating sleeve one 26 between the two sliders one 222 is concentric with the plunger pump drive shaft; then pull out the transmission shaft 29 sliding in the rotating sleeve one 26, and connect one end of the transmission shaft 29 and one end of the plunger pump drive shaft through a coupling. Since the driving gear one 25, the driven gear one 261 and the driven gear two 27 are respectively located at each rotating hinge of the rotating connecting rod one 251 and the connecting rod two 262 and are meshed with each other, the output shaft of the motor one 21 can transmit power to the transmission shaft 29 and the drive shaft in turn through the driving gear one 25, the driven gear two 27 and the driven gear one 261, thereby driving the plunger pump to operate; then start the automatic telescopic mechanism 35 on the rotating hollow disk one 22 to move closer to both sides of the plunger pump. After the two sides of the plunger pump are clamped and fixed, connect the two hoses one 45 on the workbench 1 to the suction port and the discharge port of the plunger pump respectively, and connect the two hoses two 46 to the lubricating oil input end and the output end of the plunger pump; finally, start the motor one 21 and the oil pump 441 to operate the plunger pump for testing. The actual displacement and pressure of the plunger pump can be obtained through the water pressure gauge 432 and the flow meter 433 on the hard pipe one 43, and the lubricating oil temperature can be detected through the thermometer 442 on the hard pipe two 44 to prevent the lubricating oil from overheating and affecting the stable operation of the plunger pump. At the same time, it can also be observed whether there are abnormal noises or other problems during the operation of the plunger pump; the structures such as the rotating hollow disk one 22 and the slider one 222 symmetrically arranged on both sides of the groove 11 of the plunger pump drive device 2 can also ensure that the plunger pump drive device 2 can adapt to and operate plunger pumps with drive shafts not on the same side, thereby improving the versatility of the device.

[0039] Such as Figure 1 , Figure 2As shown in the figure, the first driving mechanism 24 includes a gear ring 241 fixedly arranged on the outer ring of the first rotating hollow disk 22, a first rotating shaft 242 rotatably installed on the workbench 1, a pair of second driving gears 243 fixedly installed on the first rotating shaft 242 and meshing with the gear rings 241 on the two first rotating hollow disks 22 respectively, a first worm gear 244 fixedly installed at one end of the first rotating shaft 242, and a first worm 245 rotatably installed on the workbench 1 and meshing with the first worm gear 244. A first hand crank 246 is installed at one end of the first worm 245. When it is necessary to drive the first rotating hollow disk 22 to rotate, first manually rotate the first hand crank 246 to make the first worm 245 rotate, so that the first worm 245 meshes and drives the first worm gear 244. Then the first worm gear 244 will drive the first rotating shaft 242 to rotate, so that the two second driving gears 243 on the first rotating shaft 242 respectively mesh and drive the gear rings 241 on the two first rotating hollow disks 22. Finally, the first rotating hollow disk 22 will rotate with the gear ring 241, so that the long sliding hole 221 on the first rotating hollow disk 22 is aligned with the driving shaft of the plunger pump.

[0040] As Figure 2 , Figure 4 shown in the figure, the second driving mechanism 28 includes a second rotating sleeve 281 fixed to the first connecting rod 251 and rotatably passing through one side of the first rotating hollow disk 22, a second worm gear 282 fixed to the second rotating sleeve 281 and located on one side of the first rotating hollow disk 22, and a second worm 283 rotatably installed on one side of the first rotating hollow disk 22 and meshing with the second worm gear 282. The second rotating sleeve 281 is rotatably connected to the output shaft of the first motor 21. A first knob 284 is installed at one end of the second worm 283. When it is necessary to drive the first connecting rod 251 to turn over, first manually rotate the first knob 284 to make the second worm 283 mesh and drive the second worm gear 282. Then the second worm gear 282 will drive the second rotating sleeve 281 to rotate relative to the first rotating hollow disk 22. Since the second rotating sleeve 281 is rotatably connected to the output shaft of the first motor 21, the first connecting rod 251 will turn over around the output shaft of the first motor 21, thereby indirectly adjusting the relative position between the first slider 222 and the long sliding hole 221 to facilitate aligning the transmission shaft 29 connecting the first rotating sleeve 26 and the driving shaft of the plunger pump.

[0041] As Figure 1 , Figure 3As shown in the figure, the driving mechanism three 33 includes a second rotating shaft 331 rotatably installed in the groove 11, a second motor 332 fixedly installed on the workbench 1 and driving the second rotating shaft 331 to rotate. One end of the flipping arm 31 is fixedly connected to the second rotating shaft 331. A worm and worm gear reducer 333 is installed between the second motor 332 and one end of the second rotating shaft 331. When it is necessary to drive the flipping arm 31 to flip, start the second motor 332 to drive the second rotating shaft 331 to rotate, and then the two flipping arms 31 on the second rotating shaft 331 can be driven to flip synchronously. Among them, the worm and worm gear reduction motor can reduce the speed of the second motor 332 and increase the torque, and can also be self-locked before and after the second motor 332 is started to ensure that the pressure rod 32 between the flipping arms 31 stably presses the plunger pump.

[0042] As Figure 3 、 Figure 6 As shown in the figure, the driving mechanism four 34 includes sliders two 341 fixed to both ends of the pressure rod 32 and hollow inside, sliding grooves 342 opened on the flipping arms 31 for the sliders two 341 to slide, a first lead screw 343 fixed in the sliding grooves 342 and parallel to the sliding grooves 342, a first nut 344 rotatably installed in the slider two 341 and threadedly connected to the first lead screw 343, a third worm 345 rotatably installed in the slider two 341 and fixed to the first nut 344, a third rotating shaft 346 rotatably passing through the two sliders two 341 and the middle pressure rod 32, and a pair of third worms 347 fixed to the third rotating shaft 346 and meshing with the third worms 345 in the two sliders two 341 respectively. One end of the third rotating shaft 346 passes through the slider two 341 and is fixedly installed with a second hand crank 348. When it is necessary to drive and adjust the relative position of the pressure rod 32 between the two flipping arms 31, first manually rotate the second hand crank 348 to make the third rotating shaft 346 and the third worm 347 rotate. Then the third worm 347 will drive the third worms 345 at both ends of the pressure rod 32 to rotate through meshing. The two third worms 345 drive the first nuts 344 in the two sliders two 341 to rotate respectively. Since the first nut 344 is threadedly connected to the first lead screw 343 and the first lead screw is parallel to the sliding groove 342, finally, under the rotation of the first nut 344, the two sliders two 341 will slide along the sliding grooves 342 on the flipping arms 31 and drive the middle pressure rod 32 to move relative to the two flipping arms 31.

[0043] As Figure 1 、 Figure 4As shown in the figure, the automatic telescoping mechanism 35 includes two link rods three 351 with one end hinged to one side of the slider one 222, a sliding sleeve 352 sleeved on the transmission shaft 29, a link rod four 353 with both ends respectively hinged to the sliding sleeve 352 and one end of the link rod three 351, a driving assembly 5 for driving the two link rods three 351 to flip towards or away from each other, a clamping ring 354 that can telescopically move at the front end of the sliding sleeve 352, and an adjusting assembly 6 for adjusting the distance between the clamping ring 354 and the sliding sleeve 352. The two link rods three 351 flip between both sides of the transmission shaft 29 and both sides of the long sliding hole 221 respectively. The clamping ring 354 and the transmission shaft 29 are coaxial, and the diameter of the clamping ring 354 is larger than the diameter of the transmission shaft 29. When it is necessary to clamp both sides of the plunger pump, first start the driving assembly 5 to drive the two link rods three 351 to flip towards each other, so that the included angle between the two link rods three 351 is reduced. Then, the link rod four 353 respectively hinged to the link rod three 351 will also reduce the included angle and simultaneously push the sliding sleeve 352 to move relative to the transmission shaft 29. Then, the telescopable clamping ring 354 at the front end of the sliding sleeve 352 will gradually approach the side of the plunger pump. Since the above structures are symmetrically arranged on both sides of the groove 11, both sides of the plunger pump will be clamped and fixed in the middle by the two clamping rings 354. Also, because the clamping ring 354 and the transmission shaft 29 are coaxial and the diameter of the clamping ring 354 is larger than the diameter of the transmission shaft 29, the clamping ring 354 will not only not affect the connection between the transmission shaft 29 and the driving shaft of the plunger pump, but also can stably clamp and fix the periphery of the driving shaft of the plunger pump to ensure the smooth and safe transmission of the transmission shaft 29. Among them, the adjusting assembly 6 can adjust the distance between the clamping ring 354 and the sliding sleeve 352 to ensure that the clamping ring 354 can extend enough to clamp plunger pumps of different widths.

[0044] As Figure 4As shown, the driving component 5 includes a pair of bevel gears one 51 respectively fixedly installed at the turning centers of the two connecting rods three 351, a rotating shaft four 52 rotatably installed on one side of the slider one 222 and parallel to the long strip sliding hole 221, a bevel gear two 53 fixedly installed on the rotating shaft four 52 and meshing with the two bevel gears one 51 respectively, a rotating sleeve three 54 rotatably installed on the rotating hollow disk one 22 and through which the rotating shaft four 52 slides and penetrates, a worm gear four 55 fixedly installed on the rotating sleeve three 54, a worm four 56 rotatably installed on the rotating hollow disk one 22 and meshing with the worm gear four 55, and a motor three 57 fixedly installed on the rotating hollow disk one 22 and connected to drive the worm four 56. The rotating shaft four 52 and the rotating sleeve three 54 are connected by a sliding key. The rotating sleeve three 54 is located at one end of the long strip sliding hole 221 away from the center of the rotating hollow disk one 22. When it is necessary to drive the two connecting rods three 351 to turn, first start the motor three 57 to drive the worm four 56, so that the worm four 56 meshes and drives the worm gear four 55 to rotate. Then the worm gear four 55 will drive the rotating sleeve three 54 to rotate. Since the rotating shaft four 52 is slidably inserted and there is a sliding key connection between the two, the rotating shaft four 52 will rotate with the rotating sleeve three 54. Then the bevel gear two 53 at the front end of the rotating shaft four 52 meshes and drives the bevel gear one 51, so that the connecting rod three 351 connected to the turning center by the bevel gear one 51 turns. Also, because the bevel gears one 51 of the upper and lower connecting rods three 351 are respectively meshed on both sides of the bevel gear two 53, the two connecting rods three 351 will turn in the direction of approaching or separating from each other, and thus the included angle between the two connecting rods three 351 will be reduced or enlarged. The sliding key connection between the rotating shaft four 52 and the rotating sleeve three 54 can effectively and stably transmit power while not affecting the movement of the driving mechanism two 28 to drive and adjust the slider one 222.

[0045] As Figure 4As shown, the adjustment component 6 includes a rotating hollow disk two 61 rotating at the front end of the sliding sleeve 352, a central gear 62 fixedly installed on the sliding sleeve 352 and located at the inner center of the rotating hollow disk two 61, a pair of nuts two 63 rotating in the rotating hollow disk two 61 and located on both sides of the central gear 62 respectively, a planetary gear 64 fixedly installed on the nut two 63 and meshing with the central gear 62, and a pair of lead screws two 65 vertically passing through the rotating hollow disk two 61 and respectively threadedly connected to the two nuts two 63. One end of the two lead screws two 65 is vertically fixedly connected to the clamping ring 354. When it is necessary to adjust the distance between the sliding sleeve 352 and the clamping ring 354, the rotating hollow disk two 61 at the front end of the sliding sleeve 352 can be directly manually rotated, so that the two planetary gears 64 in the rotating hollow disk two 61 rotate around the middle central gear 62. Since the central gear 62 is fixed on the sliding sleeve 352, the two planetary gears 64 will rotate around the central gear 62 and can also rotate themselves to drive the nut two 63 to rotate. Then, the two lead screws two 65 respectively threadedly connected to the two nuts two 63 will relatively expand and contract the pressure ring away from or close to the sliding sleeve 352 during the rotation of the nut two 63, thereby achieving the effect of adjusting the distance between the sliding sleeve 352 and the clamping ring 354.

[0046] As Figure 6As shown, a limiting hole 352a is formed in the inner wall of the sliding sleeve 352. A limiting post 352b is slidably inserted into the limiting hole 352a. A spring is arranged between the limiting post 352b and the bottom of the limiting hole 352a. One end of the limiting post 352b is a hemispherical surface and extends out of the limiting hole 352a. A ring-shaped arc groove 291 for fitting the hemispherical surface of the limiting post 352b is formed on the transmission shaft 29. A positioning retaining ring 292 is fixedly arranged on the transmission shaft 29. The sliding sleeve 352 moves between the positioning retaining ring 292 and the front end of the transmission shaft 29. When the sliding sleeve 352 contacts the positioning retaining ring 292, the top end of the limiting post 352b just fits into the ring-shaped arc groove 291. When the sliding sleeve 352 moves close to the plunger pump side, first, the sliding sleeve 352 is closely attached to the side of the positioning retaining ring 292 so that the limiting post 352b on the inner wall of the sliding sleeve 352 is aligned with the ring-shaped arc groove 291 on the transmission shaft 29. Then, the spring in the limiting hole 352a will push one end of the limiting post 352b into the ring-shaped arc groove 291, enabling the sliding sleeve 352 to drive the transmission shaft 29 close to the drive shaft of the plunger pump. Furthermore, the coupling between the transmission shaft 29 and the drive shaft can be installed quickly and conveniently. When one end of the transmission shaft 29 is completely in contact with the drive shaft, the limiting post 352b that has been pushed into the ring-shaped arc groove 291 will be pulled out by the still-moving sliding sleeve 352, thus releasing the locking between the transmission shaft 29 and the sliding sleeve 352, facilitating the sliding sleeve 352 to push the clamping ring 354 to clamp the plunger pump. When the sliding sleeve 352 moves away from the plunger pump side, the sliding sleeve 352 will return to contact the retaining ring 292 on the transmission shaft 29. While pushing the transmission shaft 29 away from the drive shaft of the plunger pump, the connection between the limiting post 352b and the ring-shaped arc groove 291 is restored, facilitating the preparation work for the subsequent plunger pump.

Claims

1. An operating test bench for a plunger pump of a fracturing truck, comprising a workbench (1), characterized in that, A groove (11) for placing a plunger pump is formed on the surface of the workbench (1). A plunger pump driving device (2), a plunger pump fixing device (3), and a plunger pump testing device (4) are respectively arranged around the groove (11) of the workbench (1). The plunger pump driving device (2) includes a pair of motors one (21) installed on both sides of the workbench (1), a rotating hollow disc one (22) rotating on the output shaft of the motor one (21), a support frame (23) fixed to the workbench (1) for the rotating hollow disc one (22) to rotate and be installed, a driving mechanism one (24) for driving the rotating hollow disc one (22) to rotate, a driving gear one (25) fixed to the output shaft of the motor one (21) and located inside the rotating hollow disc one (22), a pair of long strip sliding holes (221) respectively formed on both sides of the rotating hollow disc one (22) and aligned with each other, a pair of sliders one (222) respectively sliding in the two long strip sliding holes (221), a rotating sleeve one (26) with both ends rotatably passing through the two sliders one (222), a driven gear one (261) fixedly installed on the rotating sleeve one (26) and located inside the rotating hollow disc one (22), a connecting rod one (251) with one end hinged to the output shaft of the motor one (21) and located on one side of the driving gear one (25), a connecting rod two (262) with one end hinged to the rotating sleeve one (26) and located on the other side of the driving gear one (25), a driven gear two (27) rotating between the other ends of the connecting rod one (251) and the connecting rod two (262), a driving mechanism two (28) arranged on the rotating hollow disc one (22) for driving the connecting rod one (251) to flip. The driven gear two (27) meshes with both the driving gear one (25) and the driven gear one (261) and is located between them. The long strip sliding hole (221) is perpendicular to the axis of the rotating hollow disc one (22). A transmission shaft (29) is slidably inserted into the rotating sleeve one (26), and the transmission shaft (29) is connected to the rotating sleeve one (26) through a sliding key. The plunger pump fixing device (3) includes a pair of flipping arms (31) that can flip on the side walls of both sides of the groove (11), a pressure rod (32) with both ends slidably connected to the flipping arms (31) and capable of pressing on the upper part of the plunger pump, a driving mechanism three (33) for driving the two flipping arms (31) to flip, a driving mechanism four (34) for driving the pressure rod (32) to slide on the flipping arms (31), and an automatic telescoping mechanism (35) arranged on the rotating hollow disc one (22) on both sides of the groove (11) and capable of telescopically clamping both sides of the plunger pump. The described plunger pump testing device (4) includes a water tank (41) and an oil tank (42) respectively fixed to the bottom of the workbench (1), a pair of first rigid pipes (43) fixed to the workbench (1) and respectively connected to the input end and the output end of the water tank (41), a pair of second rigid pipes (44) fixed to the workbench (1) and respectively connected to the input end and the output end of the oil tank (42), a throttle valve (431), a water pressure gauge (432), and a flow meter (433) respectively installed on the first rigid pipes (43), an oil pump (441) and a thermometer (442) respectively installed on the second rigid pipes (44), a first flexible pipe (45) connecting the first rigid pipes (43) and the suction port or the discharge port of the plunger pump, and a second flexible pipe (46) connecting the second rigid pipes (44) and the lubricating oil input end or the output end of the plunger pump.

2. The operating test bench for a fracturing truck plunger pump according to claim 1, characterized in that: The described first driving mechanism (24) includes a gear ring (241) fixedly arranged on the outer ring of the first rotating hollow disc (22), a first rotating shaft (242) rotatably installed on the workbench (1), a pair of second driving gears (243) fixedly installed on the first rotating shaft (242) and respectively meshing with the gear rings (241) on the two first rotating hollow discs (22), a first worm gear (244) fixedly installed at one end of the first rotating shaft (242), a first worm (245) rotatably installed on the workbench (1) and meshing with the first worm gear (244), and a first hand crank (246) installed at one end of the first worm (245).

3. The operation test bench of a fracturing truck plunger pump according to claim 1, characterized in that: The described second driving mechanism (28) includes a second rotating sleeve (281) fixed to the first connecting rod (251) and rotatably passing through one side of the first rotating hollow disc (22), a second worm gear (282) fixed to the second rotating sleeve (281) and located on one side of the first rotating hollow disc (22), a second worm (283) rotatably installed on one side of the first rotating hollow disc (22) and meshing with the second worm gear (282), wherein the second rotating sleeve (281) is rotatably connected to the output shaft of the first motor (21), and a first knob (284) is installed at one end of the second worm (283).

4. The operation test bench for a fracturing truck plunger pump according to claim 1, wherein: The described third driving mechanism (33) includes a second rotating shaft (331) rotatably installed in the groove (11), a second motor (332) fixed to the workbench (1) and driving the second rotating shaft (331) to rotate, one end of the flipping arm (31) is fixedly connected to the second rotating shaft (331), and a worm and worm gear reducer (333) is installed between the second motor (332) and one end of the second rotating shaft (331).

5. The operation test bench of a fracturing truck plunger pump according to claim 1, characterized in that: The driving mechanism four (34) includes slider two (341) which is fixed at both ends of the pressure rod (32) and has a hollow interior, a chute (342) which is formed in the flipping arm (31) and allows slider two (341) to slide, a lead screw one (343) which is fixed in the chute (342) and parallel to the chute (342), a nut one (344) which is rotatably installed in slider two (341) and threadedly connected to the lead screw one (343), a worm gear three (345) which is rotatably installed in slider two (341) and fixedly installed on the nut one (344), a rotating shaft three (346) which rotatably passes through the two slider two (341) and the intermediate pressure rod (32), a pair of worm gears three (347) which are fixedly installed on the rotating shaft three (346) and respectively mesh with the worm gear three (345) in the two slider two (341), one end of the rotating shaft three (346) passes through the slider two (341), and a hand crank two (348) is fixedly installed thereon.

6. The running test bench for a fracturing truck plunger pump according to claim 1, characterized in that: The automatic telescoping mechanism (35) includes two link three (351) whose one ends are hinged to one side of the slider one (222), a sliding sleeve (352) which is sleeved on the transmission shaft (29), a link four (353) whose two ends are respectively hinged to the sliding sleeve (352) and one end of the link three (351), a driving component (5) which drives the two link three (351) to approach or move away from each other for flipping, a clamping ring (354) which can telescopically move at the front end of the sliding sleeve (352), an adjusting component (6) which adjusts the distance between the clamping ring (354) and the sliding sleeve (352), the two link three (351) respectively flip between the two sides of the transmission shaft (29) and the two sides of the long sliding hole (221), the clamping ring (354) and the transmission shaft (29) are coaxial, and the diameter of the clamping ring (354) is larger than the diameter of the transmission shaft (29).

7. The operating test bench for a fracturing truck plunger pump according to claim 6, characterized in that: The driving component (5) includes a pair of bevel gears one (51) which are respectively fixedly installed at the flipping centers of the two link three (351), a rotating shaft four (52) which is rotatably installed on one side of the slider one (222) and parallel to the long sliding hole (221), a bevel gear two (53) which is fixedly installed on the rotating shaft four (52) and respectively meshes with the two bevel gears one (51), a rotating sleeve three (54) which is rotatably installed on the rotating hollow disc one (22) and allows the rotating shaft four (52) to slide through, a worm gear four (55) which is fixedly installed on the rotating sleeve three (54), a worm gear four (56) which is rotatably installed on the rotating hollow disc one (22) and meshes with the worm gear four (55), a motor three (57) which is fixedly installed on the rotating hollow disc one (22) and drives the worm gear four (56), the rotating shaft four (52) and the rotating sleeve three (54) are connected by a sliding key, and the rotating sleeve three (54) is located at one end of the long sliding hole (221) far from the center of the rotating hollow disc one (22).

8. The operation test bench of a fracturing truck plunger pump according to claim 6, characterized in that: The adjusting component (6) includes a rotating hollow disk II (61) rotating at the front end of the sliding sleeve (352), a central gear (62) fixedly installed on the sliding sleeve (352) and located at the inner center of the rotating hollow disk II (61), a pair of nuts II (63) rotating in the rotating hollow disk II (61) and located on both sides of the central gear (62) respectively, a planetary gear (64) fixedly installed on the nut II (63) and meshing with the central gear (62), and a pair of lead screws II (65) vertically passing through the rotating hollow disk II (61) and respectively threadedly connected to the two nuts II (63). One ends of the two lead screws II (65) are vertically and fixedly connected to the clamping ring (354).

9. The operation test bench of a fracturing truck plunger pump according to claim 6, characterized in that: A limiting hole (352a) is formed in the inner wall of the sliding sleeve (352), a limiting post (352b) is slidably inserted into the limiting hole (352a), a spring is arranged between the limiting post (352b) and the bottom of the limiting hole (352a), one end of the limiting post (352b) is hemispherical and extends out of the limiting hole (352a), a ring-shaped arc groove (291) for fitting the hemispherical surface of the limiting post (352b) is formed on the transmission shaft (29), a positioning retaining ring (292) is fixedly arranged on the transmission shaft (29), the sliding sleeve (352) moves between the positioning retaining ring (292) and the front end of the transmission shaft (29), and when the sliding sleeve (352) contacts the positioning retaining ring (292), the top end of the limiting post (352b) just fits into the ring-shaped arc groove (291).

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