An adaptive automatic loading device for micro roller screw pair photoelastic models.

Abstract

To provide a highly adaptive static automatic loading device of a roller screw photoelastic model and technical support for its stress consolidation test.SOLUTION: An adaptive automatic loading device includes an installation bed, in which a bed 4 and a worktable 1 are fixed through a bolt, and the worktable 1 can move back and forth along a bed guide rail; a driving motor and a console 2 are installed on the worktable 1; the driving motor is connected to a gear transmission mechanism, and the driving motor is controlled by the console 2; a gear transmission mechanism is connected to a screw clamping mechanism 8, and drives a nut to rotate through a gear to realize loading onto a roller screw pair; and displays and controls the magnitude of the loading force through a force sensor and a console 4; a gear mounting bracket is connected to the outside of the gear transmission mechanism through a gear shaft 6, and the gear mounting bracket is connected to the worktable 1 through a bolt.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of roller screw loading equipment, and particularly to an adaptive automatic loading device for micro roller screw photoelastic model. [Background technology]

[0002] Planetary roller screws have the advantages of high transmission speed, high frequency response, high reliability, long service life, and strong ability to adapt to harsh working environments (dust, chemical accumulation, no lubrication, etc.), and are now widely used. However, the uneven distribution of thread load limits the improvement of PRSM's bearing capacity, leading to increased large transmission noise, increased wear, and reduced work life, which severely restricts the application of PRSM in the fields of high load and long life, and there is a need to conduct research on the distribution of PRSM thread load.

[0003] In research tests on the load distribution of the roller screw, in order to achieve internal stress consolidation, the roller screw photoelastic model needs to be subjected to heat treatment while maintaining a static and long-term loading state, and currently there is no automatic sustained loading device for the roller screw photoelastic model. Summary of the Invention [Problem to be solved by the invention]

[0004] The technical problem to be solved by the present invention is to provide a highly adaptable static automatic loading device for roller screw photoelastic model, and further provide technical support for its stress consolidation test. [Means for solving the problem]

[0005] To achieve the above objectives, the present invention provides the following technical solutions: An automatic loading device for a roller screw pair photoelastic model, comprising: a mounting bed, the bed and a worktable are fixed through a bolt; the worktable can move back and forth along a bed guide rail; a driving motor and a console are mounted on the worktable; the driving motor is connected to a gear transmission mechanism, the driving motor is controlled by the console; the gear transmission mechanism is connected to a screw clamping mechanism, and drives the nut to rotate through a gear to realize loading into the roller screw pair; and the magnitude of the loading force is displayed and controlled through a force sensor and the console; a gear mounting bracket is connected to the outside of the gear transmission mechanism through a gear shaft, and the gear mounting bracket is connected to the worktable through a bolt.

[0006] As a preferred technical solution of the present invention, the gear transmission mechanism includes a central sun gear, the driving rotation shaft of which is fixedly connected to the motor output shaft, the sun gear is driven in mesh with three surrounding planetary gears, the gear shaft of the planetary gear is connected to a nut tightening device through a key, and the nut tightening device is connected to the nut of the screw clamping mechanism, and the loading onto the roller screw pair is realized by the rotation of the nut under the driving of the motor.

[0007] As a preferred technical solution of the present invention, the structural member of the screw clamping mechanism includes a base and an upper plate, and there is a threaded guide rod between two circular plates, the upper plate moves horizontally along the guide rod, and there are a loading nut and a lock nut attached to the guide rod above and below the upper plate, and a tension pressure sensor is installed between the loading nut and the upper plate, and the magnitude of the loading force can be displayed and adjusted through the console. A gasket with adjustable diameter is installed at the lower part of the upper plate, and the gasket is connected to the upper plate through a bolt, and the diameter of the hole in the gasket can be selected according to the diameter of different models of screws. A stopper is fixedly connected to the adjustable gasket, and a limiting groove is opened on the side surface of the nut outer circle of the roller screw pair, and the stopper is inserted into the inside of the limiting groove. An angle contact ball bearing is installed in the central hole of the base and used to fix the screw. The bearing fixes different models of roller screw pairs through shaft sleeves with different diameters.

[0008] As a preferred technical solution of the present invention, the gear mounting bracket supports and mounts the gear through the gear shaft, and one end cap is connected to the tip of the bracket through a bolt to ensure the cleaning of the gear drive mechanism. Effect of the Invention

[0009] Compared with the prior art, the advantages of the present invention are as follows: 1. The guide rail slide groove design can accommodate the loading of any length of roller screw pairs within the design range. 2. The motor and gear transmission system are interlocked to ensure that the three nuts are automatically loaded at the same speed and simultaneously. 3. The tension pressure sensor between the loading nut and the upper plate can avoid the eccentric load problem of the roller screw pair and ensure the authenticity of the test. 4. The design of replaceable gasket and bearing replaceable shaft sleeve allows the device to be used with multiple sizes of roller screw pairs, expanding the scope of use of the device. 5. The screw clamping mechanism can ensure the continuity of loading on the screw after loading and locking the nut, which makes it convenient to carry out heat treatment.

[0010] The above description is merely an outline of the technical solution of the present invention. In order to make the technical solution of the present invention more clearly understood and to be able to be implemented in accordance with the content of the specification of the present invention, and to make the above and other objects, features and advantages of the present invention more obvious and understandable, the following particularly preferred embodiments are given and described in detail with reference to the drawings. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a front view of the present invention. [Diagram 2] FIG. 2 is a structural diagram of the bed of the present invention. [Diagram 3] FIG. 2 is a structural diagram of the gear mounting bracket of the present invention. [Figure 4] FIG. 2 is a structural diagram of a gear transmission mechanism according to the present invention. [Diagram 5] FIG. 2 is a structural diagram of the nut tightening device of the present invention. [Figure 6] FIG. 2 is a structural diagram of a screw clamping mechanism according to the present invention. [Figure 7] FIG. 2 is a structural diagram of the upper plate and base of the present invention. [Figure 8] FIG. 2 is a structural diagram of a nut and its outer circle to which the present invention is applied. [Figure 9] FIG. 2 is a structural diagram of a replaceable gasket of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The following embodiments of the present invention will be described in detail with reference to the drawings, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without any creative efforts are within the scope of protection of the present invention.

[0013] For a further understanding of the present invention, the present invention will now be described in detail with reference to the drawings.

[0014] One embodiment of the adaptive automatic loading device for the micro roller screw pair photoelastic model is shown in Figures 1 to 9, the device includes a worktable 1, the worktable 1 is fixedly connected to a console 2, the console 2 detects and displays the magnitude of the loading force of the three loading nuts 81 in the screw clamping mechanism 8 through a tension pressure sensor 82, and controls the operation of the motor 3, the motor 3 is fixedly connected to the worktable 1, the worktable 1 and the bed 4 are slidably connected through a guide rail 41 and fixedly connected to a bolt through a T-shaped groove 42, and the worktable 1 is fixed at any position on the bed according to the different lengths of the roller screw pair. The worktable 1 and the gear mounting bracket 52 are fixedly connected by a bolt, and the other end of the gear mounting bracket 52 is fixedly connected to the bolt and the worktable 1 through the T-shaped groove 42, so as to realize stable loading of the motor and stable transmission of the gear.

[0015] The motor 3 and the sun gear 542 in the gear transmission mechanism 54 are connected via a key, and the motor 3 drives the sun gear 542 to rotate under the control of the console 2, and the sun gear 542 drives the three planetary gears 541, 543, and 544 in the gear transmission mechanism 54 to rotate through tooth meshing transmission, and the sun gear 542 and the planetary gears 541, 543, and 544 in the gear transmission mechanism 54 are connected to four gear shaft support holes 53 in the gear mounting bracket 52 via gear shafts, and a gear set end cap 51 is connected to the tip of the gear mounting bracket 52 with a bolt.

[0016] The three planetary gears 541, 543, 544 in the gear transmission mechanism 54 and the gear shaft 6 are rotatably connected via a key, and the other end of the gear shaft 6 and the nut tightening device 7 are rotatably connected via a key. A powerful compression spring is fixed to the connection end of the gear shaft 6 and the nut tightening device 7. As the loading nut 81 is loaded, the upper plate 83 in the screw clamping mechanism 8 moves forward along the guide rod 85, and under the action of the pressure of the powerful compression spring, the nut tightening device 7 presses the loading nut 81 to prevent it from loosening.

[0017] The screw clamping mechanism 8 includes a base 86 and an upper plate 83, which is horizontally arranged on the bed, the base 86 and the bed are fixedly connected by a bolt, the upper plate 83 is freely arranged on the bed, two guide rods 85 are screwed to the base, a bearing 88 is installed in the center hole of the base to fix the screw, different diameters of shaft sleeves 87 can be selected to match different models of roller screw pairs, the upper end of the guide rod 85 and the upper plate 83 are connected through a screw hole 833, a loading nut 81 is installed on the guide rod at the top of the upper plate to realize the loading continuity during the test, and a tension pressure sensor 82 is installed between the loading nut and the upper plate to realize the real-time detection and adjustment of the loading force, and avoid the roller screw pair from appearing the eccentric load phenomenon. A lock nut 84 is installed on the guide rod at the bottom of the upper plate to avoid the loosening of the loading force during the test. The lower part of the upper plate is connected with a replaceable gasket 811 through the screw hole 832 of the upper plate, the size of the central diameter of the gasket is selected according to the outer circle diameter size of the nut, so as to fit different models of roller screw pairs, and the size of the central hole diameter of the upper plate determines the maximum diameter of the compatible screw. A stopper 8112 is fixedly connected to the upper part of the gasket 811, which is fitted with the limiting groove 8101 installed on the outer circle of the nut, thereby limiting the rotation of the nut.

[0018] Specifically, the motor 3 can be started through the console 2 to drive the sun gear 542 to rotate, the sun gear 542 drives the planetary gears 541, 543, 544 to rotate, the planetary gears 541, 543, 544 drive the gear shaft 6 to rotate, the gear shaft 6 drives the nut tightening device 7 to rotate, the nut tightening device 7 drives the loading nut 81 to rotate, the loading nut 81 applies pressure to the nut 810 of the roller screw pair through the upper plate 83, the upper plate 83 moves horizontally along the guide rod 85, under the action of the strong compression spring on the gear shaft 6, the nut tightening device 7 presses the loading nut 81 forward to realize the loading sequence, the pressure is reacted to the display screen of the console 2 through the tension pressure sensor 82, the nut 810 cannot rotate under the restriction of the stopper 8112 of the gasket 811, thereby applying pressure to the ball and the screw. After loading is complete, the lock nut 84 is manually tightened to prevent relaxation of the loading force during testing.

[0019] Although embodiments of the present invention are shown and described, it will be understood by those skilled in the art that numerous changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is limited by the appended claims and their equivalents. [Explanation of symbols]

[0020] 1-Work table 2- Console 3-Motor 4-Bed 41-Guide rail 42-T groove 5-Gear mechanism 51-Gear Set End Cap 52-Gear mounting bracket 53-Gear shaft support hole 54-Gear transmission system 541-Planetary Gear 1 542 - Sun Gear 543-Planetary Gear 2 544-Planetary Gear 3 6-Gear shaft 7-Tightening device 8-Screw clamping mechanism 81-Loading nut 82-Tension pressure sensor 83-Upper Plate 831-Screw connection hole 832-Gasket bolt hole 833-Guide rod connection hole 84 - Lock nut 85-Guide Rod 86-Base 87-Shaft sleeve 88-Bearing 89 - Screw 810-Nut 8101-Restriction groove 8102 - Nut 811-Gasket 8111-Gasket 8112-Stopper

Claims

1. An adaptive automatic loading device for a micro roller screw pair photoelastic model that applies an axial load to a roller screw pair model made of a photoelastic material, comprising: The loading device includes a bed, a worktable, three nut tightening devices, a gear transmission mechanism, and a screw clamping mechanism, the bed and the worktable are slidably connected through a guide rail provided on the bed, the worktable can move along the guide rail, a driving motor and a console are attached to the worktable, the driving motor is connected to the gear transmission mechanism, and the driving motor is controlled by the console; The roller screw pair model includes a screw, a screw nut, and a plurality of rollers, the rollers being located between the innermost screw and the outermost screw nut, the screw and the rollers being screwed together, the rollers being screwed together, and a ring-shaped screw nut flange protruding outward is provided at the center of the outer side of the screw nut; the screw clamping mechanism includes a base and an upper plate, with three threaded guide rods between the base and the upper plate, with three loading nuts attached to the three threaded guide rods above the upper plate, with three lock nuts attached to the three threaded guide rods below the upper plate, with three pressure sensors installed between the three loading nuts and the upper plate, and the three pressure sensors are capable of detecting a magnitude of a loading force, which is a pressure between the three loading nuts and the upper plate; The roller screw pair model is fixed to the screw clamping mechanism, one end of the screw passes through a central hole installed in the upper plate, and the screw nut penetrates a part of the upper plate into the central hole; A gasket having an adjustable diameter is attached between the upper plate and the threaded nut flange, the gasket is connected to the upper plate via a bolt, a stopper is fixedly connected to the gasket, a limiting groove is formed in the threaded nut flange, and the stopper is inserted into the limiting groove to limit the movement of the threaded nut, An angular contact ball bearing is inserted into a hole provided at the center of the base, and the other end of the screw is attached to and fixed in the shaft sleeve of the angular contact ball bearing, thereby fixing the screw; The gear transmission mechanism includes a transmission gear set, the transmission gear set includes a central sun gear and three peripheral planetary gears, the driving rotation shaft of the sun gear is fixedly connected to a motor output shaft of the driving motor, the sun gear and the three planetary gears are meshed and driven, the gear shafts of the three planetary gears are respectively connected to the three nut tightening devices via keys, and the three nut tightening devices are respectively connected to the three loading nuts of the screw clamping mechanism, Under the driving of the driving motor, the gear shaft is driven to drive and rotate the nut tightening device, the nut tightening device is driven to rotate the loading nut, the loading nut applies pressure to the threaded nut through the upper plate, the upper plate moves horizontally along the three threaded guide rods to rotate the loading nut of the screw clamping mechanism to realize loading into the roller screw pair model, a gear mounting bracket is connected to the outside of the gear transmission mechanism through a gear shaft, and the gear transmission mechanism is connected to the workbench through a bolt, The adaptive automatic loading device for a micro roller screw pair photoelastic model, characterized in that the console detects and displays the magnitude of the loading force of the loading nut in the screw clamping mechanism through the pressure sensor, and controls the operation of the driving motor to realize real-time detection and adjustment of the loading force.

2. The adaptive automatic loading device for micro roller screw pair photoelastic models as described in claim 1, characterized in that the diameter of the hole in the gasket can be selected according to the diameter of the screws of different roller screw pair models, and different roller screw pair models can be fixed using axial sleeves having different diameters.

3. The adaptive automatic loading device for a micro roller screw pair photoelastic model according to claim 1, characterized in that the gear mounting bracket supports and mounts the gear through a gear shaft, and an end cap is connected to the tip of the gear mounting bracket through a bolt to ensure the cleanliness of the gear transmission mechanism.

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