123 results about "Ball spline" patented technology

The invention discloses a reverse type annular tooth groove planetary roller screw which comprises a nut, a screw rod, a plurality of rollers and a retainer, a multi-head internal thread is arranged in the nut, the rollers and the screw rod are both of an annular tooth groove structure without a helix angle, and the annular tooth grooves of the rollers are meshed with the internal thread of the nut and the annular tooth grooves of the screw rod respectively; first gears are machined at the two ends of the annular tooth groove of the lead screw, second gears are machined at the two ends of the annular tooth groove of the roller, and the first gears are meshed with the multiple second gears at the same time. The retainer is of an integral flexible retainer structure, and the pin rollers have the self-adaptive capacity in multiple directions in the circumferential direction and the radial direction through the retainer. And an arc-shaped roller path is designed on the screw rod and is matched with the ball spline housing to play a linear rolling guiding and rotation stopping role on the screw rod. The reverse lead screw has the advantages of being large in transmission ratio, compact in structure, easy to machine and assemble, low in cost, good in self-adaptive performance, high in positioning precision, good in reliability and the like.

The invention discloses a porous medium static pressure air floatation spline which comprises a spline shaft, a spline sleeve outer sleeve, an air bearing, a spline sleeve, a flange sleeve, a valve plate and a porous medium. The air floating spline is cylindrical, a plurality of air paths and static pressure cavities are formed in the air floating spline, porous media are mounted in trapezoidal grooves of the spline housing, and the internal static pressure cavities enable circumferential torsional moment applied to the spline shaft to be borne by the porous media and static pressure supports between trapezoidal tooth slopes on the spline shaft when the spline works; radial force applied to the spline shaft is borne by a static pressure support between the porous medium and the inclined plane of the trapezoidal teeth and a static pressure support on the inner ring of the air bearing; the axial load applied to the outer sleeve of the spline housing is borne by the annular static pressure cavity and the annular static pressure cavity; according to the porous medium static pressure air floatation spline, abrasion of the spline in the working process is reduced, and the problem that the spline precision is affected due to abrasion after a traditional ball spline works for a period of time is solved.

The embodiment of the invention provides a ball spline and a transmission assembly, and the ball spline comprises a spline shaft which is provided with a first guide groove in the radial direction; the spline shaft sleeve is provided with a spline, and an integrated sealing ring and a dustproof cover are symmetrically arranged on two sides of the spline; a first ball channel is formed in the spline, and a second guide groove is formed in the inner ring of the spline in the radial direction; the first guide groove and the second guide groove form a second ball channel; the first ball channel and the second ball channel are communicated through the integrated sealing ring to form a ball channel. The spline shaft is matched with the guide groove of the spline to form the continuous ball channel, and the limiting structure of the integrated sealing ring and the dustproof cover is combined, so that the step defect of the traditional sectional design is eliminated, the friction resistance and abrasion are reduced, the sealing performance and the connection reliability of the dustproof cover are improved, and the transmission precision and stability are improved.

The present application discloses a robotic force-controlled polishing end effector with active suppression, comprising a rotary motion component, a constant force adjustment component, a motion decoupling component, and a polishing disc component; the rotary motion component transmits rotary power to a ball spline via a spline shaft; the constant force adjustment component transmits axial force to the ball spline, which can move axially while rotating synchronously with the motor, thereby achieving decoupling of rotation and axial movement, while simultaneously monitoring the force applied to the polishing disc component in real time; the polishing disc component is connected to the ball spline to achieve synchronous rotation and synchronous telescopic movement with the ball spline. The present application can achieve precise control of axial force and rotational speed, while actively suppressing vibration during the polishing process. The overall structure is simple and compact, easy to control, with high force control accuracy and a high response bandwidth.

An apparatus for aligning a bioprocessing drive head includes an assembly of rotating and sliding bearings configured to operatively connect a drive motor to a rotatable shaft, a drive head operatively connected to the rotatable shaft, the drive head configured to rotate an impeller within a bioprocessing vessel. The apparatus further including a linear movement mechanism operatively connected to the rotary ball spline mechanism and / or the rotatable shaft. The linear movement mechanism being configured to move the drive head linearly via the rotatable shaft into operative contact with the impeller, without linearly moving the drive motor.

The utility model discloses an outer cylindrical guide sleeve inner ball spline, and relates to the field of mechanical transmission. By arranging eight groups of outer ball channels on the outer wall of the rectangular shaft and adopting high-bearing plane ball channel stress points on four sides, compared with a linear ball guide rail which can only be stressed on one side, the four-side high-torque transmission can be realized, the torque transmission capability is effectively improved, the application requirement of a high-torque scene is met, and the service life of the bearing is prolonged. The external connection grooves are formed in the outer wall of the outer shaft sleeve at equal angles and can be connected with an external rotating mechanism, 360-degree rotating operation is achieved, the limitation that a rotatable ball spline arc face can only be applied in a small-torque scene is overcome, the application range is expanded, and under the condition that the whole ball spline does not need to be separated from the external rotating mechanism, the service life of the ball spline is prolonged. Therefore, the inner shaft sleeve and parts such as the balls in the inner shaft sleeve can be conveniently maintained or replaced, the maintenance cost and difficulty are reduced, and the maintainability of equipment is improved.

The invention belongs to the field of insulator quality detection robots in overhead transmission lines, and discloses a climbing mechanism for vertical insulator string detection, a robot and a climbing detection method thereof, the climbing mechanism comprises a ball spline, the vertical upward direction is used as the height direction, and the ball spline extends along the height direction; the spline shaft mounting plate is fixedly connected to the lower surface of the ball spline in a sleeving manner; the claw plate is movably connected to the upper surface of the ball spline in a sleeving mode through a spline nut sleeve; the rubber gasket is fixedly mounted on the lower surface of the claw plate; a first driving mechanism is arranged on the spline shaft mounting plate, connected with the claw plate and used for driving the claw plate to move on the ball spline in the height direction. The climbing mechanism can accurately move up and down along the insulator through the first driving mechanism, the climbing mechanism can accurately rotate along the insulator through the second driving mechanism, and the climbing mechanism can climb on the insulator through cooperation of the two driving mechanisms.

The utility model provides a gear transmission device, which belongs to the technical field of mechanical transmission and comprises a gear box body, a driving transmission mechanism and a driven transmission mechanism. A driving bearing seat and a driven bearing seat are arranged in the gear box body; the driving transmission mechanism comprises a driving shaft which is horizontally mounted on a driving bearing seat through a driving bearing and a driving gear which sleeves the periphery of the driving shaft; the shaft end of the driving shaft is arranged outside the gear box body and is connected with a prime motor; the driven transmission mechanism comprises a driven gear meshed with the driving gear, a driven hollow shaft arranged in the driven gear in a penetrating mode, a ball spline sleeve arranged in the driven hollow shaft and a spline shaft arranged in the ball spline sleeve in a penetrating mode. By means of the gear box, the problems that in the prior art, a gear box can only transmit torque, does not have the axial telescopic function, needs to be combined with other mechanisms to achieve axial movement, is large in occupied space, increases structural complexity and the like can be solved.

The utility model discloses a slidable impact-resistant starlike sleeve universal joint assembly. The driving shaft assembly mainly solves the problem that a traditional driving shaft assembly is limited in sliding stroke and cannot meet the requirement for large sliding amount. The first channel (42) is arranged on the inner wall of the mounting groove; the second channel is formed in the circumferential outer wall of the intermediate shaft; the retainer (43) is arranged between the mounting groove and the intermediate shaft; and the rolling element (44) is arranged on the retainer and is matched with the first channel and the second channel. According to the slidable impact-resistant starlike sleeve universal joint assembly, the starlike sleeve is of a ball spline structure, torque transmission is guaranteed, meanwhile, the slippage function is achieved, power transmission is even, efficiency is high, and carrying is stable and safe.

A ball spline device includes a spline shaft, the outer side wall provided with raceway grooves extending in the axial direction, each raceway groove comprising, a first groove section and a second groove section, and the width of the second groove section being greater than that of the first groove section; a spline nut coaxially fitted over the spline shaft; and first rolling bodies. When the spline nut is located at a first position, the first rolling bodies are located in the first groove sections and in constraint fit with the first groove sections; and when the spline nut is located at a second position, the first rolling bodies are located in the second groove sections, such that the spline nut and the spline shaft have a preset movement amount in the circumferential direction. Further provided are an automated guided vehicle and a stereoscopic warehouse system.

The utility model provides an alternating control mechanism for a ground knife and a handcart of an electric cabinet. The alternating control mechanism comprises a ball spline shaft, a ground knife spline shaft, a handcart assembly, a ground knife assembly and a handcart head, the motor reducer is connected with the ball spline shaft through a synchronous belt structure and controls the ball spline shaft to stretch; the driven gear inner ring sleeves the outer edge of the ball spline shaft and rotates along with the ball spline shaft; one end of the ball spline shaft is fixedly connected with a handcart head, and the other end of the ball spline shaft is provided with a second connecting seat which is fixed on a linear sliding block of the grounding knife-switch assembly; the handcart assembly stretches out and draws back along the sliding mechanism along with the ground knife spline shaft through the telescopic support. The outer edge of the ground knife spline shaft is sleeved with a driving gear through a positioning flange, and the driving gear and the driven gear are in meshing transmission through a transition gear. Under the condition that the appearance of the cabinet body is not changed and the original manual operation service is not interfered, the operation service of the robot on the switch cabinet is realized, the use of human resources is reduced, and the working efficiency is improved.

A ball spline (10) comprises a splined shaft (20), an outer sleeve (30), and two circulation elements (40). The outer sleeve (30) is slidably mounted on the splined shaft (20) to form a load channel (62) for installing balls (60) therebetween, and has an oil guide channel (35) inside. The circulation elements (40) are attached to two outer end surfaces (31) of the outer sleeve (30) and each have an oil filler opening (45), an oil reservoir (44) communicating with the oil filler opening (45), the load channel (62), and the oil guide channel (35), and an oil guide portion (46) disposed in the oil reservoir (44), corresponding to the oil filler opening (45), and projecting toward the oil guide channel (35).After injecting lubricant into the oil filling hole (45) of one of the circulation elements (40), the lubricant lubricates the balls (60) on both sides by means of the oil guide portion (46) and the oil guide channel (35), thereby enhancing the lubricating effect.

The utility model relates to the technical field of dispensing machines, and provides a four-shaft driving module of a dispensing machine, which comprises a first shaft mechanism, a second shaft mechanism and a ball spline lead screw mechanism, the first shaft mechanism and the second shaft mechanism in the four-shaft driving module are arranged to be of a cross structure, meanwhile, the ball spline lead screw mechanism is arranged at one end of the second shaft mechanism, and compared with an existing gantry type four-shaft module, the four-shaft driving module is more compact in structure and more concise in tail end installation; and compared with an existing SCARA four-axis robot, the dispensing operation space is wider, and the dispensing operation range is larger.

A perforated plastic shoe cover winding and packaging machine, comprising a frame and a large winding plate connected with the frame. A large hole is formed at the center of the large winding plate, an outer edge rotor is rotationally connected at the large hole, a planetary carrier is arranged on the outer edge rotor, planetary traction driven rollers are respectively arranged on the two sides of the large winding plate, a planetary support shaft is arranged at the center of the outer edge rotor, the tail end of the planetary support shaft is rotationally connected to the frame, ball spline lifting / lowering and rotating mechanisms are symmetrically mounted on the two sides of the outer edge rotor, each ball spline lifting / lowering and rotating mechanism comprises a ball spline lead screw, and the end part of the ball spline lead screw passes through the outer edge rotor and is connected to a fork-shaped winding shaft. The perforated plastic shoe cover winding and packaging machine not only has high efficiency and good stability in shoe cover winding, but also has a high degree of automation, so that manual participation is less in the shoe cover processing process, thereby reducing labor intensity, and further improving shoe cover packaging efficiency.

The utility model provides a ball spline structure which comprises a spline shaft provided with a plurality of ball grooves, an outer cylinder arranged on the spline shaft in a sliding and sleeving mode and an end cover located at one end of the outer cylinder, the outer wall of the side, away from the end cover, of the outer cylinder protrudes to form an installation portion, and first ball grooves corresponding to the ball grooves are formed in the inner wall of the outer cylinder. A second ball groove communicated with the first ball groove is formed in the mounting part, a third ball groove communicated with the first ball groove is formed in the end cover, and the first ball groove, the second ball groove and the third ball groove are matched to form a ball channel used for containing balls; an annular oil cavity is formed in the mounting part, and an elastic lubricating assembly is arranged in the oil cavity. The elastic lubricating assembly automatically adjusts the supply amount of lubricating oil according to the motion state and the lubricating requirement of the balls, and it is guaranteed that the optimal lubricating effect can be kept under different working conditions.

This invention provides a polyurethane test piece production apparatus, including a casting device and a post-curing device. The casting device includes a first cavity, a second cavity, a front fixing plate, a rear fixing plate, and a base plate. The front and rear fixing plates are detachably mounted on the base plate, and a plurality of first and second cavities are alternately installed between the front and rear fixing plates via ball-spline shafts. The post-curing device includes a receiving box and a clamping frame. This invention also provides a method for preparing polyurethane test pieces using this polyurethane test piece production apparatus. The polyurethane test piece production apparatus provided by this invention can simultaneously produce test pieces of multiple specifications, improving product reliability and work efficiency. It can also perform multi-layer curing on test pieces of multiple specifications to determine the tensile strength and tear strength of different parts of the polyurethane layer in the thickness direction, thereby guiding the design of NDI-type polyurethane rollers to obtain the optimal design scheme.

This application relates to a ball spline shaft without a ball retainer. A shaft assembly for transmitting torque in a transmission system is provided. The shaft assembly includes an outer shaft member extending along an axis and including an inner surface defining a bore and a plurality of outer recesses at least partially defining the bore. An inner shaft member extends along the axis and includes an outer surface defining a plurality of inner recesses or at least one of the plurality of inner recesses aligned with the outer recesses. At least one rolling element is positioned between the outer recesses and the inner recesses or between the outer recesses and the inner recesses. At least one of the outer surface of the inner shaft member or the inner surface of the outer shaft member is configured to axially retain at least one rolling element, and the shaft assembly does not include a ball retainer.

The invention provides an immersed tunnel gravel foundation bed sludge property in-situ monitoring device, which belongs to the field of environment monitoring equipment and comprises a driving unit, a decoupling speed regulation unit and a monitoring acquisition unit. The driving unit comprises a ball spline screw assembly and a driving motor, and the ball spline screw assembly comprises a spline shaft, a ball spline nut and a ball nut. The decoupling speed regulation unit comprises a shell, an input shaft and an output shaft, an input regulation assembly is arranged on the input shaft, an output regulation assembly is arranged on the output shaft, and the top end of the input shaft is connected with the spline shaft. The monitoring and collecting unit comprises a collecting cover and a variable stirring rotor, the collecting cover is arranged at the bottom of the shell, and the variable stirring rotor is arranged in the collecting cover and connected with the output shaft. According to the immersed tunnel gravel foundation bed sludge property in-situ monitoring device, the lifting action and the rotating action can be achieved through one driving motor, the size of the device is reduced, and operation convenience is improved.

The high-rigidity push rod linear motor comprises a guide shaft, a locking nut, a front bearing, a front end cover, a hollow shaft, a rotor, a stator, a rear bearing and a rear end cover, one end of the hollow shaft penetrates through the front bearing and then is connected with the front end cover, the other end of the hollow shaft penetrates through the rear bearing and then is connected with the rear end cover, and the rotor is installed on the outer side of the hollow shaft. The stator is installed on the outer side of the rotor, the linear motor further comprises a ball spline, and the guide shaft sequentially penetrates through the ball spline and the locking nut and then is connected with the hollow shaft. Compared with the prior art, the utility model has the advantages of high rigidity, high precision and the like.

To provide a ball spline with a lubricating oil flow passage.SOLUTION: A ball spline with a lubricating oil flow passage includes a spline shaft, a sleeve body, and two circulation members. The sleeve body is movably attached to cover the spline shaft, and forms a load passage for storing a plurality of balls between the spline shaft and itself. The sleeve body has an oil guidance passage in the inside thereof. The two circulation members are respectively arranged on the outer end surface of the sleeve body. The spline shaft passes through the two circulation members. Each of the two circulation members has an oil injection hole, an oil chamber, and an oil guidance portion. The oil chamber is connected with the oil injection hole, the load passage, and the oil guidance passage of the sleeve body. The oil guidance portion is arranged in the oil chamber so as to correspond with the oil injection hole, and protrudes toward the oil guidance passage. With the above-described structure features, only by injecting lubricating oil from the oil injection hole of one of the circulation members, the balls on both sides can be lubricated with the lubricating oil through the oil guidance portion and the oil guidance passage, and the lubrication effect can be improved.SELECTED DRAWING: Figure 1

An adaptive tool holder of a robotic arm includes: a tool shank; a hollow barrel seat, connected below the tool shank; a ball spline with an upper section, an outer convex ring and a lower section; a spring seat, disposed within the barrel seat and located on the upper section of the ball spline; an elastic element, disposed within the barrel seat, where both ends of the elastic element abut against a bottom of the tool shank and the spring seat respectively; a spring guide pin, disposed through the spring seat; a connecting post, disposed within the lower section of the ball spline, where a top of the connecting post is connected and fixed to the spring guide pin; and a friction stir welding tool inserted and fixed detachably at a bottom end of the connecting post.

The invention relates to the technical field of mechanical transmission, in particular to a self-locking positioning ball spline, a system and a method.The self-locking positioning ball spline comprises a sliding rod, a sliding sleeve, a self-locking positioning actuator, a position sensing module and a control module, and at least one load roller path extending in the axial direction is arranged on the outer circumferential surface of the sliding rod; the sliding sleeve is arranged on the sliding rod, a ball circulation loop corresponding to the load raceway is arranged on the inner circumferential surface of the sliding sleeve, and a plurality of balls are arranged in the ball circulation loop, so that the sliding sleeve can slide in the axial direction of the sliding rod at low friction; the self-locking positioning actuator is arranged on the sliding sleeve, and the self-locking positioning actuator is configured to receive a locking instruction and apply mechanical acting force to the sliding rod, so that static friction force is generated to prevent relative movement between the sliding sleeve and the sliding rod, and self-locking positioning is achieved; the device is more stable and reliable in the occasions of vertical installation, bearing of non-directional external force or intermittent work, and potential safety hazards and precision loss caused by sliding or displacement are avoided.

This utility model discloses a flower-tying machine belonging to the technical field of flower-tying machines. It includes a machine head, a winding box at one end of the bottom of the outer casing of the machine head, a photoelectric positioning plate and a winding shaft synchronous wheel sequentially arranged on the top of the winding box, a bobbin inside the winding box, a flower-tying nozzle at the bottom of the winding box, a hook needle inside the flower-tying nozzle, a ball spline shaft at the top of the winding box, a needle bar at the top of the ball spline shaft, a first photoelectric switch on the outside of the ball spline shaft, a lead screw synchronous wheel on one side of the top of the machine casing, and a lead screw at the bottom of the lead screw synchronous wheel. By adopting microcomputer control, the machine operates intelligently and conveniently, eliminating the need for frequent adjustments by operators, thus improving production efficiency. The mechanical movement uses a lead screw and a ball spline shaft, which efficiently transmits power and reduces operating noise. The main body of the machine is compact, significantly reducing its size and weight, and the internal parts are tightly fitted, greatly reducing the failure rate.

The invention discloses a high-bearing secondary jacking mechanism, which relates to the technical field of motor production, and comprises a jacking positioning assembly and a pressure head assembly, the jacking positioning assembly comprises a movable plate, positioning sliding rods are fixedly connected to the four corners of the top of the movable plate, a tray supporting plate is fixedly connected to the tops of the four positioning sliding rods, and a first base plate is slidably connected to the outer sides of the four positioning sliding rods. The invention discloses a high-bearing-capacity two-stage jacking mechanism. A two-stage positioning mechanism of tray jacking and machine shell jacking is adopted, a tray jacking air cylinder drives a first base plate to slide and ascend along a positioning sliding rod, and preliminary tray positioning is completed; and then the casing jacking cylinder pushes the casing positioning block to perform secondary jacking through the guide of a jacking rod and a ball spline, and a clamping structure of a locking block and a locking groove of the height positioning cylinder is combined, so that the casing positioning precision reaches a relatively high level, the problem of accumulative errors caused by single action in a traditional positioning mode is effectively solved, and the positioning precision of the casing is improved. And a high-precision precondition is provided for press fitting.

This invention relates to the field of braised food processing technology, and more particularly to a lifting-type braising device for braised food processing, comprising a movable support base, a support frame, a braising barrel, and a connecting plate. The support frame is fixedly installed on the movable support base, and the connecting plate is fixedly installed on the upper part of the support frame. A motor is fixedly installed on one side of the connecting plate, and a drive wheel is fixedly connected to the output end of the motor. The end of the connecting plate away from the motor is rotatably connected to a ball spline via a bearing. In this invention, by designing a lifting-type braising device for braised food processing, the automatic rotation of the inner filter cylinder during the lifting process is achieved through the linkage design of the motor, toothed belt, gear set, and ball spline. The inner cylinder rotates slowly in the braising broth, replacing the traditional manual turning. This not only makes the food heated more evenly but also completely avoids the breakage and damage of the food caused by manual stirring, maintaining the appearance and quality of the braised food.

The utility model discloses an assembling platform of a wind power gear box, which belongs to the technical field of wind power gear box processing equipment and comprises a base, a fixing groove is arranged in the center of the base, support columns are arranged at two ends of the base, a limit rod and a lead screw are arranged between the support columns, the lead screw penetrates through the support columns and is connected with a moving motor, and the outer walls of the limit rod and the lead screw are connected with a moving disc. A hoisting assembly is arranged at the bottom of the movable disc, and a shaking restraining assembly is arranged in the movable disc. According to the gear lifting appliance, the lifting assembly is arranged, when a gear provided with a gear shaft is lifted, the gear shaft can penetrate through the through hole formed in the center of the lifting scaffold, so that the lifting appliance does not need to be replaced when the gear is lifted, and the ball spline is driven by the lifting splined hub to vertically descend to a proper position through the shake suppression assembly; the clamping splined hub drives the ball spline to rotate synchronously, the ball spline drives the restraining clamping plate to rotate synchronously, the restraining clamping plate clamps the hanging scaffold from the periphery, and therefore shaking of the hanging scaffold is restrained before assembling.

The utility model provides a ball spline pair assembly. The ball spline pair assembly comprises a spline shaft, a nut, a retainer, a lining and a limiting structure. A ball groove is formed in the surface of the spline shaft, multiple sets of ball channels are arranged in the nut and divided into load channels and non-load channels, circulating rolling of balls is achieved, friction loss is reduced, and transmission efficiency is improved. Five groups of ball channels are arranged in the retainer, so that the bearing capacity and the rigidity are enhanced; the lining is located between the shell and the retainer and provides buffering and high-precision guiding. The limiting plate adopts a C-shaped buckle structure and is matched with annular grooves and pin holes in the two ends of the shell, so that stable assembly of the assembly is ensured. And the gasket is arranged between the C-shaped buckle and the lining, so that the sealing performance is improved, and pollution invasion is prevented. The assembly is compact in structure, stable in operation, high in bearing capacity and suitable for high-precision transmission occasions such as numerical control machine tools and industrial robots, and has good application prospects.

An apparatus for aligning a bioprocessing drive head includes: a rotary and sliding bearing assembly configured to operatively connect a drive motor to a rotatable shaft; and a drive head operatively connected to the rotatable shaft, configured to rotate an impeller within a bioprocessing container. The apparatus further includes a linear motion mechanism operatively connected to a rotary ball spline mechanism and / or the rotatable shaft. The linear motion mechanism is configured to linearly move the drive head via the rotatable shaft to operatively contact the impeller, without linearly moving the drive motor.

The utility model relates to the technical field of tools, in particular to a lifting and rotating composite tool table which is characterized in that a horizontal rotating group and a rotating and lifting group are sequentially mounted on one side of the plate surface of a tool main plate along a product advancing route, and a ball spline lead screw assembly is arranged on a first tool bottom plate in a penetrating manner and mounted on the first tool bottom plate through a bolt; the first tool disc is installed at the top end of the ball spline lead screw assembly, and the lifting part is connected with the ball spline lead screw assembly through the conveying assembly and used for driving the first tool disc to reciprocate up and down along the Z axis. The rotating part is connected with the ball spline lead screw assembly through the conveying assembly and used for driving the first tool disc to move along the Z axis. A visual system and a mechanical grabbing assembly are matched to adjust the posture and position required by a product in the detection process, rotation of the product around a Z axis and up-down movement of the product along the Z axis are achieved, an air-blowing cleaning device is additionally arranged at the feeding position of the product, surface air-blowing cleaning can be conducted on the product entering the equipment firstly, and the equipment is more perfect.

The invention discloses a device for machining an elliptical inner wall of a pump body by using a double-tool-rest vertical lathe, which comprises a ball spline shaft assembly, a live center assembly and a turning tool fixing telescopic assembly, and the ball spline shaft assembly comprises a vertically arranged ball spline shaft body, a first ball spline sleeve and an elliptical cam; the first ball spline sleeve is arranged on the ball spline shaft body in a sleeving mode, the oval cam is fixed to the first ball spline sleeve, the lower end of the ball spline shaft body is connected with a workbench of the vertical lathe through the connecting mechanism, and the live center assembly is connected with a left tool rest of the vertical lathe and abuts against the ball spline shaft body from top to bottom. The turning tool fixing telescopic assembly comprises a sliding bottom plate, a support, a tool apron and a turning tool body and can vertically ascend and descend along with the right tool rest, when the oval cam rotates, the sliding bottom plate can telescopically move in the left-right direction, and a pump body to be machined is fixed to the center of the workbench. The problem that the elliptical inner wall of the pump body cannot be cut in the prior art is solved, and the device is low in cost and good in machining precision.