Jacking force controllable tailstock of ball screw dynamic stroke error measuring instrument

Abstract

The utility model relates to the technical field of a tailstock, and particularly discloses a jacking force controllable tailstock of a ball screw dynamic stroke error measuring instrument, which comprises a tailstock, a force sensor, a hydraulic servo valve, a hydraulic servo controller and an industrial personal computer. The tailstock comprises a tailstock base, the tailstock base is provided with a front cavity and a rear cavity, a mandrel is arranged in the front cavity, a hydraulic cylinder body is arranged in the rear cavity, a piston rod is arranged in the hydraulic cylinder body, and the force sensor is fixedly connected with the piston rod through threads and is in stress contact connection with the mandrel. And the hydraulic servo valve is provided with two hydraulic servo valve oil outlets. The device is simple in structure, actually measured jacking force value signals output by the force sensor and set jacking force value signals output by the industrial personal computer are synchronously transmitted to the hydraulic servo controller, the hydraulic servo controller outputs the signals to the hydraulic servo valves, the pressure of the oil outlets of the two hydraulic servo valves is adjusted, and the jacking force value of the hydraulic servo valves is adjusted. And the piston rod slides in the hydraulic cylinder body, so that the jacking force of the tested lead screw can be automatically and accurately controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of tailstocks, in particular to a tailstock with controllable tightening force of a ball screw dynamic stroke error measuring instrument. Background Art

[0002] When using a measuring instrument to test a ball screw, it is usually necessary to tighten the ball screw to be tested with a tailstock. Excessive tightening force of the tailstock will cause the ball screw to be tested to deflect, and the screw deflection has an important impact on the accuracy of the screw stroke error measurement. At present, it is difficult for the tailstock of a traditional measuring instrument to accurately control the tightening force of the screw to be tested, which easily leads to problems such as low measurement accuracy and poor consistency of the measuring instrument.

[0003] Based on this, the invention patent with publication number CN116079641A announced a horizontal lathe tailstock clamping force display device, including a tailstock sleeve, a rotary mandrel, a ZNLBU sensor and a controller, which can display the clamping force value and set the clamping force according to the weight and diameter of the workpiece, thereby improving the working accuracy. However, it uses a thrust screw to push the tailstock sleeve forward to extend out of the machine tool to clamp the workpiece. The tailstock clamping force is transmitted to the plane bearing through the rotary mandrel, and then the tailstock sleeve is subjected to the pressure of the top and the rotary mandrel, and the pressure is transmitted to the ZNLBU sensor, and then to the disc spring through the transition piece. The force structure is complex, and the sensor is prone to errors in detecting the pressure value, which leads to inaccurate clamping force values. Utility Model Content

[0004] The utility model aims to provide a tailstock with controllable top tightening force for a ball screw dynamic stroke error measuring instrument, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A tightening force controllable tailstock of a ball screw dynamic stroke error measuring instrument comprises a tailstock, a force sensor, a motor, a hydraulic pump, a hydraulic servo valve, a hydraulic servo controller and an industrial computer, wherein the tailstock comprises a tailstock base.

[0007] As a further solution of the utility model, the tailstock base is provided with a front cavity and a rear cavity, a core shaft is provided in the front cavity, the core shaft is slidably connected to the front cavity, a hydraulic cylinder body is provided in the rear cavity, an end cover is provided at the rear of the tailstock base, a piston rod is provided in the hydraulic cylinder body, the piston rod is slidably connected to the hydraulic cylinder body, and hydraulic chamber one and hydraulic chamber two are formed in the hydraulic cylinder body.

[0008] As a further solution of the utility model, the end face of the piston rod facing the front cavity is provided with threads, the force sensor is fixedly connected to the piston rod via threads, and the force sensor is force-contactedly connected to the end face of the core shaft facing the rear cavity.

[0009] As a further solution of the utility model, the hydraulic pump is provided with a hydraulic pump oil outlet, the hydraulic servo valve is provided with a hydraulic servo valve oil inlet, the hydraulic pump oil outlet is connected to the hydraulic servo valve oil inlet through a pipeline, the hydraulic servo valve is provided with two hydraulic servo valve oil outlets, the hydraulic chamber one is provided with a hydraulic chamber one oil inlet, the hydraulic chamber two is provided with a hydraulic chamber two oil inlet, and the two hydraulic servo valve oil outlets are respectively connected to the hydraulic chamber one oil inlet and the hydraulic chamber two oil inlet through pipelines.

[0010] As a further solution of the utility model, the hydraulic pump is connected to the motor through a circuit, the force sensor and the industrial computer are respectively connected to the hydraulic servo controller through a circuit, the hydraulic servo controller is connected to the hydraulic servo valve through a circuit, the force sensor outputs the measured tightening force value to the hydraulic servo controller, the industrial computer outputs a set tightening force value signal to the hydraulic servo controller, and the hydraulic servo controller transmits a control signal to the hydraulic servo valve.

[0011] The beneficial effects of the utility model are:

[0012] 1. The utility model adopts a hydraulic servo valve with high control accuracy and fast response speed, so that the piston rod slides smoothly and accurately in the hydraulic cylinder body, thereby improving the control accuracy.

[0013] 2. The utility model has a simple structure. The measured tightening force value signal output by the force sensor and the set tightening force value signal output by the industrial computer are synchronously transmitted to the servo controller. The hydraulic servo controller outputs a signal to the hydraulic servo valve, and the pressure of the two hydraulic servo valve oil outlets is adjusted to make the piston rod slide in the hydraulic cylinder body until the measured tightening force value output by the force sensor reaches the set tightening force value output by the industrial computer. The piston rod stops moving, thereby realizing automatic and precise control of the tightening force of the measured screw, reducing the screw deflection of the measured screw, and improving the measurement accuracy of the measured screw. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 It is a cross-sectional view of the tailstock of the utility model;

[0017] In the figure: 1. tailstock; 2. force sensor; 3. motor; 4. hydraulic pump; 5. hydraulic servo valve; 6. hydraulic servo controller; 7. industrial computer; 8. pipeline; 9. circuit; 11. tailstock base; 12. spindle; 13. end cover; 14. hydraulic cylinder; 15. piston rod; 16. hydraulic chamber one; 17. hydraulic chamber two; 161. hydraulic chamber one oil inlet; 171. hydraulic chamber two oil inlet. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1 This embodiment provides a technical solution: a tailstock with controllable tightening force of a ball screw dynamic stroke error measuring instrument, including a tailstock 1, a force sensor 2, a motor 3, a hydraulic pump 4, a hydraulic servo valve 5, a hydraulic servo controller 6 and an industrial computer 7.

[0020] See also Figure 2 The tailstock 1 includes a tailstock base 11. The tailstock base 11 is provided with a front cavity and a rear cavity, a mandrel 12 is provided in the front cavity, and the mandrel 12 is slidably connected with the front cavity; a hydraulic cylinder body 14 is provided in the rear cavity, and an end cover 13 is provided at the rear of the tailstock base 11. A piston rod 15 is provided in the hydraulic cylinder body 14, and the piston rod 15 is slidably connected with the hydraulic cylinder body 14, so that a closed hydraulic chamber 16 and a hydraulic chamber 2 17 are formed in the hydraulic cylinder body 14.

[0021] The end surface of the piston rod 15 facing the front cavity is provided with threads, the force sensor 2 is fixedly connected to the piston rod 15 via threads, and the force sensor 2 is force-contactedly connected to the end surface of the core shaft 12 facing the rear cavity.

[0022] See also Figure 1 and Figure 2 The hydraulic pump 4 is used to supply oil to the hydraulic servo valve 5, and is provided with a hydraulic pump oil outlet. The hydraulic servo valve 5 is provided with a hydraulic servo valve oil inlet. The hydraulic pump oil outlet is connected to the hydraulic servo valve oil inlet through a pipeline 8. The hydraulic servo valve 5 is provided with two hydraulic servo valve oil outlets. The hydraulic chamber 1 16 is provided with a hydraulic chamber 1 oil inlet 161, and the hydraulic chamber 2 17 is provided with a hydraulic chamber 2 oil inlet 171. The two hydraulic servo valve oil outlets are respectively connected to the hydraulic chamber 1 oil inlet 161 and the hydraulic chamber 2 oil inlet 171 through pipelines 8.

[0023] The hydraulic pump 4 is connected to the motor 3 through the circuit 9, the force sensor 2 and the industrial computer 7 are respectively connected to the hydraulic servo controller 6 through the circuit 9, and the hydraulic servo controller 6 is connected to the hydraulic servo valve 5 through the circuit 9. The force sensor 2 outputs the measured tightening force value to the hydraulic servo controller 6, the industrial computer 7 outputs the set tightening force value signal to the hydraulic servo controller 6, and the hydraulic servo controller 6 transmits the control signal to the hydraulic servo valve 5.

[0024] A Morse taper hole is arranged at the front end of the mandrel 12, and a top point is connected to the Morse taper hole, and the lead screw to be measured is connected to the top point.

[0025] Working principle:

[0026] During operation, the hydraulic pump 4 supplies oil to the hydraulic servo valve 5 under the action of the motor 3. The measured screw contacts the mandrel 12 through the top, the force sensor 2 is connected to the mandrel 12 by force, and the top tightening force is transmitted to the force sensor 2 through the mandrel 12. The measured top tightening force value signal output by the force sensor 2 and the set top tightening force value signal output by the industrial computer 7 are synchronously transmitted to the hydraulic servo controller 6. The hydraulic servo controller 6 outputs a signal to the hydraulic servo valve 5 to adjust the pressure of the two hydraulic servo valve oil outlets. The hydraulic servo valve 5 supplies oil to the hydraulic chamber 1 16 and the hydraulic chamber 2 17 respectively. The oil pressure of the hydraulic chamber 1 16 and the hydraulic chamber 2 17 is unbalanced, so that the piston rod 15 moves in the hydraulic cylinder body 14 until the measured top tightening force value output by the force sensor 2 reaches the set top tightening force value output by the industrial computer 7, and the piston rod 15 stops moving.

[0027] Since the hydraulic servo valve 5 has high control accuracy and fast response speed, the piston rod 15 slides smoothly and accurately in the hydraulic cylinder body 14, thereby improving the control accuracy of the utility model.

[0028] The utility model has a simple structure. The measured tightening force value signal output by the force sensor 2 and the set tightening force value signal output by the industrial computer 7 are synchronously transmitted to the hydraulic servo controller 6. The hydraulic servo controller 6 outputs a signal to the hydraulic servo valve 5, and the pressure of the oil outlets of the two hydraulic servo valves is adjusted to make the piston rod 15 slide in the hydraulic cylinder body 14, thereby realizing automatic and precise control of the tightening force of the measured screw, reducing the screw deflection of the measured screw, and improving the measurement accuracy of the measured screw.

[0029] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A tailstock with controllable tightening force for a ball screw dynamic stroke error measuring instrument, comprising a tailstock (1) and a force sensor (2), characterized in that: It also includes a motor (3), a hydraulic pump (4), a hydraulic servo valve (5), a hydraulic servo controller (6) and an industrial computer (7); the tailstock (1) includes a tailstock base (11).

2. The tightening force controllable tailstock of the ball screw dynamic stroke error measuring instrument according to claim 1, characterized in that: The tailstock base (11) is provided with a front cavity and a rear cavity, a core shaft (12) is provided in the front cavity, the core shaft (12) is slidably connected to the front cavity, a hydraulic cylinder body (14) is provided in the rear cavity, an end cover (13) is provided at the rear of the tailstock base (11), a piston rod (15) is provided in the hydraulic cylinder body (14), the piston rod (15) is slidably connected to the hydraulic cylinder body (14), and a hydraulic chamber 1 (16) and a hydraulic chamber 2 (17) are formed in the hydraulic cylinder body (14).

3. The tightening force controllable tailstock of the ball screw dynamic stroke error measuring instrument according to claim 2, characterized in that: The end surface of the piston rod (15) facing the front cavity is provided with a thread, the force sensor (2) is fixedly connected to the piston rod (15) via the thread, and the force sensor (2) is force-contact-connected to the end surface of the core shaft (12) facing the rear cavity.

4. The tightening force controllable tailstock of the ball screw dynamic stroke error measuring instrument according to claim 2, characterized in that: The hydraulic pump (4) is provided with a hydraulic pump oil outlet, the hydraulic servo valve (5) is provided with a hydraulic servo valve oil inlet, the hydraulic pump oil outlet is connected to the hydraulic servo valve oil inlet via a pipeline (8), the hydraulic servo valve (5) is provided with two hydraulic servo valve oil outlets, the hydraulic chamber 1 (16) is provided with a hydraulic chamber 1 oil inlet (161), the hydraulic chamber 2 (17) is provided with a hydraulic chamber 2 oil inlet (171), and the two hydraulic servo valve oil outlets are respectively connected to the hydraulic chamber 1 oil inlet (161) and the hydraulic chamber 2 oil inlet (171) via pipelines (8).

5. The tightening force controllable tailstock of the ball screw dynamic stroke error measuring instrument according to claim 1, characterized in that: The hydraulic pump (4) is connected to the motor (3) via a circuit (9); the force sensor (2) and the industrial computer (7) are respectively connected to the hydraulic servo controller (6) via a circuit (9); the hydraulic servo controller (6) is connected to the hydraulic servo valve (5) via a circuit (9); the force sensor (2) outputs a measured tightening force value to the hydraulic servo controller (6); the industrial computer (7) outputs a set tightening force value signal to the hydraulic servo controller (6); and the hydraulic servo controller (6) transmits a control signal to the hydraulic servo valve (5).

Images