Lead screw pre-stretching machine tool

Abstract

The invention provides a lead screw pre-stretching machine tool. The lead screw pre-stretching machine tool comprises a tool body, a first fixing device, a stretching device and a lead screw. The first fixing device is fixedly arranged on the upper side face of the lathe bed. The stretching device is movably arranged on the upper side face of the lathe bed. One end of the screw rod is fixedly arranged on the fixing device, and the other end of the screw rod is cooperatively mounted on the stretching device; wherein the movement track of the stretching device in the direction away from the position where the first fixing device is located is defined as a first track; when the lead screw pre-stretching machine tool executes the pre-stretching action, the stretching device provides thrust in the first track direction for the connecting end of the lead screw, so that the lead screw is pre-stretched. The technical problems that when a tip abuts against the two ends of a lead screw optical axis, the two ends of the lead screw optical axis are subjected to extrusion force from the tip, a lead screw is prone to being bent towards the middle, the rigidity of the lead screw is reduced in the machining process, and the machining precision of the lead screw is further reduced are solved.

Description

Technical Field

[0001] The invention relates to the technical field of machine tools, and in particular to a screw pre-stretching machine tool. Background Art

[0002] As the main functional component of the linear axis, the screw rod needs to be fixed on the machine tool for precise machining. The machine tool in the prior art is provided with two centers, and the center holes at both ends of the screw rod are supported by the two centers to fix the screw rod on the machine tool in a clamping manner.

[0003] However, there is at least one of the following problems in the related technology: when the top point presses against the two ends of the screw shaft, the two ends of the screw shaft are subjected to the extrusion force from the top point, which easily causes the screw to bend toward the middle, thereby reducing the rigidity of the screw during processing and further reducing the processing accuracy of the screw. Summary of the invention

[0004] The technical problem solved by the present invention is that when the top point presses against the two ends of the screw shaft, the two ends of the screw shaft are subjected to the extrusion force from the top point, which easily causes the screw to bend toward the middle, thereby reducing the rigidity of the screw during processing and further reducing the processing accuracy of the screw.

[0005] In order to solve the above problems, the present invention provides a screw pre-stretching machine, comprising: a bed, a first fixing device, a stretching device, and a screw; the first fixing device is fixedly arranged on the upper side of the bed; the stretching device is movably arranged on the upper side of the bed; one end of the screw is fixedly arranged on the first fixing device, and the other end of the screw is cooperated and installed on the stretching device; wherein, the movement trajectory of the stretching device along the direction away from the position of the first fixing device is defined as the first trajectory; when the screw pre-stretching machine performs a pre-stretching action, the stretching device provides a thrust along the direction of the first trajectory to the connection end with the screw, so as to realize pre-stretching of the screw.

[0006] Compared with the prior art, the technical effect achieved by adopting this technical scheme is as follows: first, by respectively installing the two ends of the screw rod on the first fixing device and the stretching device on the screw pre-stretching machine tool, the first fixing device is fixed on the bed of the screw pre-stretching machine tool, and is used to fix one end of the screw rod, and the stretching device can move linearly relative to the first fixing device, and the movement direction is toward the position away from the first fixing device, thereby achieving that when the stretching device moves along the first trajectory toward the direction away from the first fixing device, the stretching device forms a pre-stretching force on the screw rod at the position where it is matched and connected with the screw rod, and by stretching the screw rod, it is ensured that the screw pre-stretching machine tool is not prone to bending and deformation under the action of the pre-stretching force during the processing process, thereby improving the processing rigidity of the screw rod, thereby ensuring the processing accuracy of the screw pre-stretching machine tool.

[0007] In one example of the present invention, the stretching device includes a sliding component and a telescopic component; the sliding component is slidably arranged on the upper side of the bed; the output end of the telescopic component is cooperatively connected with the sliding component, and the end of the telescopic component away from the sliding component is fixed to the upper side of the bed; wherein the output end moves along the direction of the first track and pushes the sliding component to move along the direction of the first track.

[0008] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the telescopic component and the sliding component are matched in a manner, one end of the screw rod is fixed on the first fixing device, and the other end of the screw rod is matched and connected with the sliding component. The telescopic component moves along the first trajectory to push the sliding component away from the position of the first fixing device. The sliding component transmits the thrust of the telescopic component to the screw rod to pre-stretch the screw rod. The structure of the telescopic component and the sliding component is simple, which is convenient for large-scale production and manufacturing.

[0009] In one example of the present invention, the sliding assembly includes a slide rail and a second fixing device; the slide rail is arranged on the upper side of the bed, and one end of the slide rail is close to the position of the first fixing device, and the other end of the slide rail extends in a direction away from the position of the first fixing device; the second fixing device is slidably arranged on the upper end of the slide rail; wherein, when the second fixing device slides along the slide rail in a direction away from the position of the first fixing device, the second fixing device can slide along the direction of the first track.

[0010] Compared with the prior art, the technical effect achieved by adopting this technical scheme is as follows: the slide rail is a linear rail, and the slide rail is arranged along the direction of the first track and on the upper side of the bed, the second fixing device is slidably connected to the slide rail, and the second fixing device is used to cooperate and connect with the end of the screw rod away from the first fixing device, while the second fixing device fixes the screw rod, and the second fixing device moves along the slide rail in the direction of the first fixing device under the action of the thrust of the telescopic component, or has a tendency to move but does not move, and applies a pre-stretching force to the screw rod, the slide rail and the second fixing device have a simple structure, low production difficulty, and are convenient for large-scale production.

[0011] In one example of the present invention, the telescopic assembly includes a hydraulic cylinder and a hydraulic rod that cooperate with each other; the hydraulic cylinder is fixed on the upper side of the bed and is located between the first fixing device and the sliding assembly; wherein the hydraulic rod moves on the side of the hydraulic cylinder away from the first fixing device and pushes the second fixing device to move along the first trajectory.

[0012] Compared with the prior art, the technical effect achieved by adopting this technical solution is that the combination of the hydraulic cylinder and the hydraulic rod can have a larger driving force, can provide the screw rod with a pre-stretching force that meets a preset value, and ensures the processing rigidity of the screw rod.

[0013] In one example of the present invention, a first fixing device is provided with a first fixing chuck at one end away from the bed; a second fixing device is provided with a second fixing chuck at one end away from the bed; wherein the first fixing chuck and the second fixing chuck are respectively used to fix the two ends of the screw rod, and the first central axis of the first fixing chuck and the second central axis of the second fixing chuck are always kept coincident with each other, and the first central axis and the second central axis are both parallel to the upper side of the bed.

[0014] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the lead screw is fixed on the lead screw pre-stretching machine by means of the first fixed chuck and the second fixed chuck, so as to achieve more precise positioning while clamping the lead screw.

[0015] In one example of the present invention, a screw pre-stretching machine includes a coaxial instrument, one end of which is movably arranged on a slide rail, and the end of the coaxial instrument away from the slide rail is matched with the screw to detect the coaxiality of the screw; wherein, when the coaxial instrument performs a detection action, the first fixed chuck can rotate along the first central axis, and the second fixed chuck can rotate synchronously along the second central axis and drive the screw to rotate, and the coaxial instrument slides along the first track of the slide rail to realize the coaxiality detection of the screw.

[0016] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the coaxial instrument moves along the slide rail and drives the screw to rotate along the axial direction of the screw through the chucks on both sides. The detection end of the coaxial instrument contacts the rod body of the screw to obtain the overall coaxiality of the screw. After confirming that the coaxiality of the screw is within a fixed range, the screw is pre-stretched to ensure the processing accuracy of the screw pre-stretching machine.

[0017] In one example of the present invention, the slide rail includes a first guide bar and a second guide bar parallel to each other; the first guide bar is arranged along a direction parallel to the first track; the second guide bar is arranged along a direction parallel to the first track; the coaxial instrument includes a first coaxial detection component and a second coaxial detection component that cooperate with each other; the first coaxial detection component is slidably arranged on the first guide bar; the second coaxial detection component is slidably arranged on the second guide bar; wherein, when the screw rod is fixedly installed on the first fixed chuck and the second fixed chuck, the first coaxial detection component and the second coaxial detection component respectively move toward the direction of the screw rod to form a mutually cooperating connection, and slide synchronously along the first guide bar and the second guide bar to realize the coaxiality detection of the screw rod.

[0018] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: when the screw is fixedly installed on the first fixing device and the second fixing device, the first coaxial detection component and the second coaxial detection component respectively approach the position of the screw until the first coaxial detection component and the second coaxial detection component form a mating connection, and move synchronously through the first guide bar and the second guide bar to perform a full range of coaxiality detection on the screw, and retreat to the positions on both sides of the screw after the detection is completed, thereby avoiding interference with the coaxial instrument during the installation and processing of the screw and avoiding damage to the coaxial instrument, thereby improving the user experience.

[0019] In one example of the present invention, the screw pre-stretching machine includes a force measuring rail, which is fixed to the upper side of the bed, and the measuring end of the force measuring rail is connected to the stretching device for controlling the pre-stretching force of the stretching device.

[0020] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the force measuring rail is used to detect the magnitude of the pre-stretching force of the screw rod, and to control the magnitude of the pre-stretching force of the screw rod so that it is within a preset range.

[0021] In one embodiment of the present invention, the lead screw pre-stretching machine includes a length detection device, which is disposed on the upper side of the bed and is used to detect the length of the lead screw.

[0022] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the length detection device is used to detect the rod length of the screw rod to ensure that when the second fixing device applies a pre-tensioning force to the screw rod, there is sufficient reserved movable length between the second fixing device and the screw rod.

[0023] In one example of the present invention, the lead screw pre-stretching machine includes a processing tool holder, which is movably arranged on the upper side of the bed along a second trajectory for processing the lead screw; wherein the second trajectory is parallel to the first trajectory.

[0024] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: the processing tool holder processes the screw rod along the second trajectory, has good flexibility, is more convenient to use, and improves the user experience.

[0025] After adopting the technical solution of the present invention, the following technical effects can be achieved: (1) One end of the screw rod is fixed by a first fixing device, and the other end of the screw rod is stretched in a direction away from the first fixing device by a stretching device. Under the action of the pre-stretching force, the screw rod is prevented from bending during the processing, thereby improving the processing rigidity of the screw rod and ensuring the processing accuracy of the screw rod; (2) The coaxiality of the screw is detected by a coaxial instrument, which further ensures the processing accuracy of the screw pre-stretching machine tool; (3) The screw pre-stretching machine provided by the present invention has a simple structure, is easy to manufacture, and is suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings to be used in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 1 A structural schematic diagram of a screw pre-stretching machine tool provided by the present invention; Figure 2 for Figure 1 A schematic diagram of the structure of the lead screw pre-stretching machine tool from one perspective; Figure 3 for Figure 1 A schematic diagram of the structure of the lead screw pre-stretching machine tool from another perspective; Figure 4 for Figure 1 A schematic diagram of the structure of the lead screw pre-stretching machine tool from another perspective; Figure 5 for Figure 1 A schematic diagram of the structure of the lead screw pre-stretching machine tool from another perspective; Figure 6 for Figure 5 Schematic diagram of the structure of the coaxial instrument.

[0027] Description of reference numerals: 10. First fixing device; 101. First fixing chuck; 1001. First center axis; 20. Second fixing device; 201. Second fixing chuck; 202. Moving seat; 2001. Second center axis; 30. Bed; 40. Coaxial instrument; 401. First coaxial detection assembly; 402. Second coaxial detection assembly; 403. Detection head; 50. Slide rail; 501. First guide rail; 502. Second guide rail; 60. Telescopic assembly; 601. Hydraulic cylinder; 602. Hydraulic rod; 70. Processing tool holder; 701. Grinding wheel; 702. Tool holder track; 80. Force measuring rail; 90. Claw. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0029] The present invention provides a screw pre-stretching machine tool, comprising: a bed 30, a first fixing device 10, a stretching device, and a screw rod; the first fixing device 10 is fixedly arranged on the upper side of the bed 30; the stretching device is movably arranged on the upper side of the bed 30; one end of the screw rod is fixedly arranged on the first fixing device 10, and the other end of the screw rod is cooperatively installed on the stretching device; wherein, the movement trajectory of the stretching device along the direction away from the position of the first fixing device 10 is defined as the first trajectory; when the screw pre-stretching machine tool performs a pre-stretching action, the stretching device provides a thrust along the direction of the first trajectory to the connection end with the screw rod, so as to realize pre-stretching of the screw rod.

[0030] like Figure 1 As shown, specifically, the first fixing device 10 is vertically fixed to the upper side of the machine tool, the structural part of the stretching device used to connect the screw rod is perpendicular to the upper side of the machine tool, one end of the screw rod is fixedly installed on the first fixing device 10, and the rod surface of the other end of the screw rod is tightly fitted with the matching connection of the stretching component. When the screw rod is installed, the rod axis of the screw rod is parallel to the upper side of the machine tool; when the installation of the screw rod is completed, the stretching device performs a pre-stretching action, and the pre-stretching action is achieved by the stretching device slowly moving along the first trajectory direction or forming a moving trend along the first trajectory direction, so as to realize the application of a pre-stretching force to the screw rod in the direction away from the first fixing device 10 until the pre-stretching force reaches a preset value.

[0031] In one example of the present invention, the stretching device includes a sliding assembly and a telescopic assembly 60; the sliding assembly is slidably arranged on the upper side of the bed 30; the output end of the telescopic assembly 60 is cooperatively connected with the sliding assembly, and the end of the telescopic assembly 60 away from the sliding assembly is fixed to the upper side of the bed 30; wherein the output end moves along the direction of the first trajectory and pushes the sliding assembly to move along the direction of the first trajectory.

[0032] like Figure 2 As shown, specifically, the telescopic component 60 is arranged along the direction of the first track, and one end of the telescopic component 60 close to the first fixing device 10 is a fixed end fixed to the upper side of the bed 30, and the other end of the telescopic component 60 is an output end, and the output end can move linearly along the first track relative to the fixed end, and the output end of the telescopic component 60 forms a fixed connection with the sliding component, which is used to drive the sliding component to slide along the first track.

[0033] In one example of the present invention, the sliding assembly includes a slide rail 50 and a second fixing device 20; the slide rail 50 is arranged on the upper side of the bed 30, and one end of the slide rail 50 is close to the position of the first fixing device 10, and the other end of the slide rail 50 extends in a direction away from the position of the first fixing device 10; the second fixing device 20 is slidably arranged at the upper end of the slide rail 50; wherein, when the second fixing device 20 slides along the slide rail 50 in a direction away from the position of the first fixing device 10, the second fixing device 20 can slide along the first track direction.

[0034] Specifically, the slide rail 50 is linear, and the trajectory formed by moving along the track of the slide rail 50 and in a direction away from the first fixing device 10 is the first trajectory, and the second fixing device 20 and the slide rail 50 are in sliding cooperation; the second fixing device 20 and the upper side surface of the bed 30 are perpendicular to each other, so that the second fixing device 20 and the first fixing device 10 are parallel to each other, and the connection position of the first fixing device 10 and the screw rod and the connection position of the second fixing device 20 and the screw rod are connected to form a straight line parallel to the upper side surface of the bed 30; a movable seat 202 is fixed on the lower side of the second fixing device 20, and a sliding cooperation is formed with the slide rail 50 through the movable seat 202, so that the second fixing device 20 is located on the slide rail 50 and slides.

[0035] In one example of the present invention, the telescopic assembly 60 includes a hydraulic cylinder 601 and a hydraulic rod 602 that cooperate with each other; the hydraulic cylinder 601 is fixed on the upper side of the bed 30 and is located between the first fixing device 10 and the sliding assembly; wherein the hydraulic rod 602 moves on the side of the hydraulic cylinder 601 away from the first fixing device 10, and pushes the second fixing device 20 to move along the first trajectory.

[0036] Specifically, the hydraulic cylinder 601 and the hydraulic rod 602 are arranged between the first fixing device 10 and the second fixing device 20. The hydraulic cylinder 601 is fixed on the upper side of the bed 30. A through groove for the movement of the hydraulic rod 602 is opened on the side of the hydraulic cylinder 601 away from the first fixing device 10. The hydraulic rod 602 moves along the direction of the first trajectory through the through groove of the hydraulic cylinder 601. The end of the hydraulic rod 602 away from the first fixing device 10 is cooperatively connected with the second fixing device 20, which is used to push the second fixing device 20 to move along the direction of the first trajectory or form a movement trend along the direction of the first trajectory. In one example of the present invention, a first fixing device 10 is provided with a first fixing chuck 101 at one end away from the bed 30; a second fixing device 20 is provided with a second fixing chuck 201 at one end away from the bed 30; wherein, the first fixing chuck 101 and the second fixing chuck 201 are respectively used to fix the two ends of the screw rod, and the first central axis 1001 of the first fixing chuck 101 and the second central axis 2001 of the second fixing chuck 201 are always kept coincident with each other, and the first central axis 1001 and the second central axis 2001 are both parallel to the upper side of the bed 30.

[0037] like Figure 3 , Figure 4 and Figure 5 As shown, specifically, a claw 90 is provided at the center position of the first fixed chuck 101, and the claw 90 is used to fix one end of the screw rod on the first fixed chuck 101. At the same time, the first fixed chuck 101 is connected to an external motor. Under the drive of the external motor, the first fixed chuck 101 can be located on the first fixing device 10 along the direction of its first circle center axis 1001 and rotate. A claw 90 is provided at the center position of the second fixed chuck 201, and the claw 90 is used to fix one end of the screw rod away from the first fixed chuck 101 on the second fixed chuck 201. At the same time, the second fixed chuck 201 is connected to an external motor. Under the drive of the external motor, the second fixed chuck 201 can be located on the second fixing device 20 along the direction of its second circle center axis 2001 and rotate. It should be noted that the first fixed chuck 101 and the second fixed chuck 201 have the same direction when rotating and keep the same rotation angle when rotating, so as to realize the rotation of the screw rod.

[0038] In one example of the present invention, the screw pre-stretching machine includes a coaxial gauge 40, one end of which is movably arranged on a slide rail 50, and the end of the coaxial gauge 40 away from the slide rail 50 is matched with the screw to detect the coaxiality of the screw; wherein, when the coaxial gauge 40 performs a detection action, the first fixed chuck 101 can rotate along the first central axis 1001, and the second fixed chuck 201 can rotate synchronously along the second central axis 2001 and drive the screw to rotate, and the coaxial gauge 40 slides along the first track of the slide rail 50 to realize the detection of the coaxiality of the screw.

[0039] like Figure 1 and Figure 6 As shown, specifically, when the lead screw pre-stretching machine performs a detection action, the lead screw rotates along its own rod axis driven by the rotation of the first fixed chuck 101 and the second fixed chuck 201, and a detection head 403 is provided at the connection position between the coaxial instrument 40 and the lead screw. The detection head 403 moves back and forth along the first trajectory to realize a full-range scanning detection of the lead screw body to obtain the coaxiality of the lead screw.

[0040] In one example of the present invention, the slide rail 50 includes a first guide bar 501 and a second guide bar 502 which are parallel to each other; the first guide bar 501 is arranged along a direction parallel to the first track; the second guide bar 502 is arranged along a direction parallel to the first track; the coaxial instrument 40 includes a first coaxial detection component 401 and a second coaxial detection component 402 which cooperate with each other; the first coaxial detection component 401 is slidably arranged on the first guide bar 501; the second coaxial detection component 402 is slidably arranged on the second guide bar 502; wherein, when the screw rod is fixedly installed on the first fixed chuck 101 and the second fixed chuck 201, the first coaxial detection component 401 and the second coaxial detection component 402 respectively move toward the direction of the screw rod to form a mutually cooperating connection, and slide synchronously along the first guide bar 501 and the second guide bar 502 to realize the coaxiality detection of the screw rod.

[0041] Specifically, the first guide bar 501 and the second guide bar 502 are respectively arranged on both sides of the hydraulic cylinder 601, and the first guide bar 501 and the second guide bar 502 are respectively perpendicular to the first fixing device 10, the first coaxial detection component 401 is slidably arranged on the first guide bar 501, and the third track formed by the first coaxial detection component 401 moving along the first guide bar 501 is parallel to the first track; the second coaxial detection component 402 is slidably arranged on the second guide bar 502, and the fourth track formed by the second coaxial detection component 402 moving along the second guide bar 502 is parallel to the first track; the first coaxial detection component 401 is connected with the screw rod in a matching manner. Part is a semi-arc structure, and the matching connection part of the second coaxial detection component 402 and the screw rod is an arc structure opposite to the first coaxial detection component 401. When the first coaxial detection component 401 and the second coaxial detection component 402 form a mutual matching connection, the two and the matching connection parts of the screw rod are connected to each other to form a complete annular structure; the hollow ring part in the center of the annular structure is used to pass through and detect the screw rod body, and the first coaxial detection component 401 and the second coaxial detection component 402 slide synchronously in the same direction along the first guide bar 501 and the second guide bar 502 respectively, so as to obtain the coaxiality of the screw rod more accurately in all directions.

[0042] In one example of the present invention, the screw pre-stretching machine includes a force measuring rail 80, which is fixed to the upper side of the bed 30, and the measuring end of the force measuring rail 80 is connected to the stretching device for controlling the pre-stretching force of the stretching device.

[0043] Specifically, the force measuring rail 80 is used to control the output or shutdown of the hydraulic cylinder 601. A positioner is provided on the movable seat 202. The force measuring rail 80 is connected to the movable seat 202 through the positioner. When the screw pre-stretching machine performs the pre-stretching action, the movable seat 202 is displaced relative to the force measuring rail 80, driving the positioner to produce elastic deformation. The force measuring rail 80 measures the magnitude of the pre-stretching force according to the deformation generated by the positioner. When it is detected that the pre-stretching force reaches the preset value, the force measuring rail 80 controls the hydraulic cylinder 601 to stop further pressurization.

[0044] Preferably, the screw pre-stretching machine includes a length detection device, which is arranged on the upper side of the bed 30 and is used to detect the length of the screw to ensure that there is enough distance at the end of the screw for the second fixing device 20 to move.

[0045] In one embodiment of the present invention, the lead screw pre-stretching machine includes a processing tool holder 70, which is movably disposed on the upper side of the bed 30 along a second trajectory for processing the lead screw; wherein the second trajectory is parallel to the first trajectory.

[0046] Specifically, the bed 30 is provided with a tool holder track 702 parallel to the track of the slide rail 50, the processing tool holder 70 is slidably arranged on the tool holder track 702, and the seat body part of the processing tool holder 70 can be extended and retracted, and the tool body part of the processing tool holder 70 can be rotated and extended at multiple angles relative to the tool holder, so that the processing tool holder 70 has good flexibility.

[0047] In combination with any of the above technical features, the specific implementation method of the present invention is that when the screw is processed, the claw 90 of the first fixed chuck 101 is controlled by an external motor to clamp one end of the screw to ensure that one end of the screw is fixed during processing; after one end of the screw is fixed, the hydraulic cylinder 601 starts to work, and the hydraulic cylinder 601 is connected to the movable seat 202 through the hydraulic rod 602, and the hydraulic rod 602 is used to drive the movable seat 202 to move along the direction of the first trajectory. When the screw is clamped, the length detection device detects the length of the screw, and the hydraulic cylinder 601 drives the movable seat 202 to move to the end of the screw away from the first fixing device 10; the second fixed chuck 2 01 Clamp the other end of the screw rod. After both ends of the screw rod are clamped, the first coaxial detection device and the second coaxial detection device on both sides of the screw rod begin to move toward the middle screw rod position, and move to the semi-arc structure of the first coaxial detection device and the semi-arc structure of the second coaxial detection device to connect into a ring structure. The coaxial instrument 40 has a detection head 403, and the coaxial instrument 40 begins to move along the parallel track. At the same time, the first fixed chuck 101 and the second fixed chuck 201 drive the screw rod to rotate, and the detection head 403 on the coaxial instrument 40 contacts the rod body of the screw rod, and performs all-round detection on the outer side of the screw rod to analyze the coaxiality of the screw rod. 02 drives the second fixed chuck 201 to move to ensure the coaxiality of the screw processing. After the coaxiality detection of the screw is completed, the coaxial instrument 40 returns to the initial state and moves to both sides away from the screw; then the screw begins to be pre-stretched. When the screw is pre-stretched, the movable seat 202 is connected to the force measuring rail 80 through a locator. When the movable seat 202 moves, the force measuring rail 80 starts to detect the force. The hydraulic cylinder 601 works again and slowly drives the movable seat 202 to move. When the movable seat 202 moves, it moves relative to the force measuring rail 80, driving the locator to produce elastic deformation. The pre-stretching force starts to be calculated on the force measuring rail 80. When the preset pre-stretching force is reached, the oil pressure cylinder 601 starts to work again. The pressure cylinder 601 stops pressurizing, the screw rod is in a stretched state, and the processing tool holder 70 starts working. The base of the processing tool holder 70 and the part connected to the tool head can be extended and rotated to ensure the angle and height of the grinding wheel 701 during processing. After the processing tool holder 70 reaches the processing position, the grinding wheel 701 starts to process and grind on the screw rod to be processed. When the grinding wheel 701 contacts the screw rod, the pressure of the grinding wheel 701 may cause a slight deformation of the screw rod. Through the measurement of the force measuring rail 80, the hydraulic cylinder 601 is further controlled to start working to ensure that the screw rod is in a perfect pre-stretched state during processing, thereby ensuring the accuracy and rigidity of the screw rod processing.

[0048] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A screw pre-stretching machine tool, characterized in that: include: Bed (30); A first fixing device (10), the first fixing device (10) being fixedly arranged on an upper side surface of the bed (30); A stretching device, the stretching device being movably arranged on an upper side of the bed (30); A screw rod, one end of which is fixed to the first fixing device (10), and the other end of which is cooperatively mounted on the stretching device; The movement trajectory of the stretching device in a direction away from the position of the first fixing device (10) is defined as a first trajectory; when the lead screw pre-stretching machine performs a pre-stretching action, the stretching device provides a thrust along the first trajectory direction to the connection end with the lead screw, so as to achieve pre-stretching of the lead screw.

2. The screw pre-stretching machine tool according to claim 1, characterized in that: The stretching device comprises a sliding assembly and a telescopic assembly (60); The sliding assembly is slidably arranged on the upper side of the bed (30); The output end of the telescopic component (60) is cooperatively connected with the sliding component, and one end of the telescopic component (60) away from the sliding component is fixed to the upper side of the bed (30); The output end moves along the direction of the first track and pushes the sliding component to move along the direction of the first track.

3. The screw pre-stretching machine tool according to claim 2, characterized in that: The sliding assembly comprises a sliding rail (50) and a second fixing device (20); The slide rail (50) is arranged on the upper side of the bed (30), and one end of the slide rail (50) is close to the position where the first fixing device (10) is located, and the other end of the slide rail (50) extends in a direction away from the position where the first fixing device (10) is located; The second fixing device (20) is slidably disposed on the upper end of the slide rail (50); When the second fixing device (20) slides along the slide rail (50) in a direction away from the position of the first fixing device (10), the second fixing device (20) slides along the direction of the first track.

4. The screw pre-stretching machine tool according to claim 3, characterized in that: The telescopic assembly (60) comprises a hydraulic cylinder (601) and a hydraulic rod (602) that cooperate with each other; The hydraulic cylinder (601) is fixedly arranged on the upper side of the bed (30) and is located between the first fixing device (10) and the sliding assembly; The hydraulic rod (602) moves on a side of the hydraulic cylinder (601) away from the first fixing device (10), and pushes the second fixing device (20) to move along the first trajectory.

5. The screw pre-stretching machine tool according to claim 3, characterized in that: A first fixing chuck (101) is provided at one end of the first fixing device (10) away from the bed (30); A second fixing chuck (201) is provided at one end of the second fixing device (20) away from the bed (30); The first fixed chuck (101) and the second fixed chuck (201) are respectively used to fix the two ends of the screw rod, the first center axis (1001) of the first fixed chuck (101) and the second center axis (2001) of the second fixed chuck (201) always coincide with each other, and the first center axis (1001) and the second center axis (2001) are both parallel to the upper side of the bed (30).

6. The screw pre-stretching machine tool according to claim 5, characterized in that: include: A coaxial meter (40), one end of the coaxial meter (40) being movably disposed on the slide rail (50), and one end of the coaxial meter (40) being away from the slide rail (50) being in mating connection with the screw rod, for detecting the coaxiality of the screw rod; When the coaxial tester (40) performs a detection operation, the first fixed chuck (101) can rotate along the first central axis (1001), and the second fixed chuck (201) can rotate synchronously along the second central axis (2001), thereby driving the lead screw to rotate, and the coaxial tester (40) slides along the first track of the slide rail (50) to detect the coaxiality of the lead screw.

7. The screw pre-stretching machine tool according to claim 6, characterized in that: The slide rail (50) comprises a first guide rail strip (501) and a second guide rail strip (502) which are parallel to each other; The first guide rail (501) is arranged along a direction parallel to the first track; the second guide rail (502) is arranged along a direction parallel to the first track; The coaxial instrument (40) comprises a first coaxial detection component (401) and a second coaxial detection component (402) that cooperate with each other; The first coaxial detection component (401) is slidably disposed on the first guide rail (501); the second coaxial detection component (402) is slidably disposed on the second guide rail (502); When the screw is fixedly mounted on the first fixed chuck (101) and the second fixed chuck (201), the first coaxial detection component (401) and the second coaxial detection component (402) respectively move toward the direction of the screw to form a mutually fitting connection, and synchronously slide along the first guide rail (501) and the second guide rail (502) to detect the coaxiality of the screw.

8. The screw pre-stretching machine tool according to claim 1, characterized in that: include: A force measuring rail (80) is fixedly arranged on the upper side of the bed (30), and a measuring end of the force measuring rail (80) is connected to the stretching device, and is used to control the magnitude of the pre-stretching force of the stretching device.

9. The screw pre-stretching machine tool according to claim 1, characterized in that: include: A length detection device is provided on the upper side of the bed (30) and is used to detect the length of the screw rod.

10. The screw pre-stretching machine tool according to claim 1, characterized in that: include: a processing tool holder (70), the processing tool holder (70) being movably disposed on the upper side of the bed (30) along a second trajectory and being used for processing the screw rod; The second track is parallel to the first track.

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