CN220188190U - A lifting mechanism with force measuring function suitable for static weight hardness machines - Google Patents

Abstract

The utility model provides a lifting mechanism with a force measuring function suitable for static weight hardness machines, which includes a cross beam, a tray assembly and a lifting system. The outer end of the cross beam is installed on the frame of the hardness machine, and the center of the cross beam has a a penetrating shaft hole; the pallet assembly includes a pallet, a load cell, and a ball spline. The load cell is provided at the bottom of the pallet, and the load cell is fixed on the upper end of the spline shaft of the ball spline. The spline nut of the ball spline is fixedly installed at the upper end of the shaft hole; the lifting system includes a servo motor and a screw lift, the screw lift is installed at the lower end of the shaft hole, and the servo motor drives the The lifting screw of the screw lift rises or falls in the shaft hole, and the lifting screw rises to push up the spline shaft of the ball spline. The utility model has a simple structure and can directly read the force value by placing the weight, which is convenient and fast; the ball spline has a simple structure and good anti-rotation effect, and does not require an external anti-rotation mechanism.

Description

A lifting mechanism with force measuring function suitable for static weight hardness machines

Technical field

The utility model relates to a static weight hardness machine, in particular to a lifting mechanism with a force measuring function suitable for the static weight hardness machine.

Background technique

The hardness machine is used to detect the hardness value of materials, and usually uses the static weight test force loading method. At present, some of the weight lifting mechanisms of static weight hardness machines adopt a screw lifting structure, that is, the screw rotates, and the nut rises or falls along the screw. If the tray is set on the nut, the tray will follow the nut to rotate. In order to prevent the tray from rotating To allow the weight to rotate smoothly, an anti-rotation mechanism needs to be installed on the nut; some use a guide rail lifting structure, and the pallet slides up and down along the guide rail. A positioning device needs to be installed to stabilize the pallet at a height. In order to prevent the pallet from tilting left and right, it also needs to be installed Limiter.

Whether it is a screw lifting structure or a guide rail lifting structure, the structure is relatively complex and difficult to install and maintain in a small space.

Contents of the invention

The technical problem to be solved by this utility model is to provide a lifting mechanism with a force measuring function that is simple in structure, small in size and easy to operate and suitable for static weight hardness machines. At the same time, it is equipped with a force measuring sensor and can read the test force in real time. value.

The utility model is implemented as follows:

A lifting mechanism with force measurement function suitable for static weight hardness machines, including a beam, a pallet assembly and a lifting system.

The outer end of the beam is installed on the frame of the hardness machine, and the center of the beam has a penetrating shaft hole;

The pallet assembly includes a pallet, a load cell, and a ball spline. The load cell is provided at the bottom of the pallet. The load cell is fixed on the upper end of the spline shaft of the ball spline. The ball spline The spline nut is fixedly installed on the upper end of the shaft hole;

The lifting system includes a servo motor and a screw lift. The screw lift is installed at the lower end of the shaft hole. The servo motor drives the lifting screw of the screw lift to rise or fall in the shaft hole. The lifting screw rises and lifts up the spline shaft of the ball spline.

Further, the lifting system further includes a coupling, and the servo motor is connected to the screw lift through the coupling.

Furthermore, the pallet assembly further includes a ball spline mounting sleeve, which is disposed on the upper end of the shaft hole and is used to fix the spline mother of the ball spline.

Further, the pallet assembly further includes a sensor connecting plate, the upper end of which is fixed to the load cell, and the lower end of which is fixedly mounted on the upper end of the spline shaft of the ball spline.

Further, the lifting system also includes a screw lift mounting plate, which is provided at the lower end of the shaft hole and is used to install the screw lift.

Further, the top of the lifting screw is an arc surface.

Further, the angular clearance of the ball spline is zero.

The advantage of this utility model is that the pallet assembly rises or falls in the shaft hole through ball splines. The steel balls of the ball splines are close to the key grooves on the spline shaft, and can rise and fall smoothly without the need for external limiting devices. Rotation offset, simple structure and small size; the pallet assembly is equipped with a load cell, which can read the test force value in real time, which is convenient and fast; the servo motor has high precision and runs smoothly, and controls the lifting screw to move smoothly and accurately in the shaft hole Internal lifting; the top of the lifting screw is an arc surface, which reduces the contact area with the spline shaft of the ball spline, further preventing the rotation of the spline shaft caused by the rotation of the lifting screw.

Description of drawings

The utility model will be further described below with reference to the accompanying drawings and embodiments.

Figure 1 is a schematic diagram of the overall structure of a lifting mechanism with a force measuring function suitable for static weight hardness machines according to the present invention.

Figure 2 is a schematic cross-sectional structural diagram of a lifting mechanism with a force measuring function suitable for static weight hardness machines according to the present invention.

Explanation of reference numbers: Pallet assembly 1, pallet 11, load cell 12, sensor connecting plate 13, ball spline 14, spline shaft 141, spline mother 142, ball spline mounting sleeve 15, lifting system 2, servo motor 21. Coupling 22, screw lift 23, lifting screw 231, screw lift mounting plate 24, cross beam 3, shaft hole 31.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present utility model.

This embodiment is the best embodiment of the present utility model. Please refer to Figures 1 and 2. The present utility model is a lifting mechanism with a force measuring function suitable for static weight hardness machines, including a cross beam 3, a tray assembly 1 and a lifting mechanism. System 2,

The outer end of the crossbeam 3 is installed on the frame of the hardness machine, and the center of the crossbeam 3 has a penetrating shaft hole 31;

The pallet assembly 1 includes a pallet 11, a load cell 12, a sensor connecting plate 13, a ball spline 14, and a ball spline mounting sleeve 15. The load cell 12 is provided at the bottom of the pallet 11. The load cell 12 is fixed on the sensor connecting plate 13. The sensor connecting plate 13 is fixedly installed on the upper end of the spline shaft 141 of the ball spline 14. The spline mother 142 of the ball spline 14 is fixedly installed on the ball. In the spline mounting sleeve 15, the ball spline mounting sleeve 15 is fixedly installed on the upper end of the shaft hole 31;

The lifting system 2 includes a servo motor 21, a coupling 22, a screw lift 23, and a screw lift mounting plate 24. The screw lift mounting plate 24 is installed at the lower end of the shaft hole 31. The screw lift 23 Installed at the lower end of the screw lift mounting plate 24, the servo motor 21 is connected to the screw lift 23 through a coupling 22, and drives the lifting screw 231 of the screw lift 23 in the shaft hole 31. When rising or falling, the lifting screw 231 rises and pushes up the spline shaft 141 of the ball spline 14. Preferably, the top end of the lifting screw 231 is an arc surface.

The working principle of this utility model is:

The pallet assembly 1 composed of the pallet 11, the load cell 12, the sensor connecting plate 13 and the ball spline 14 is installed on the upper end of the spline shaft 141 of the ball spline 14 for directly carrying the weight. The weight falls on the pallet 11, and the load sensor 12 can measure the real-time force value.

The outer end of the crossbeam 3 is fixed on the frame of the hardness machine. There is a through-axis hole 31 in the center of the crossbeam 3. The upper end of the shaft hole 31 is fixed with a ball spline mounting sleeve 15 through bolts. The ball spline mounting sleeve 15 The spline mother 142 of the ball spline 14 is internally fixed, and the spline shaft 141 of the ball spline 14 is limited by the steel balls. The spline shaft 141 will not rotate, thereby achieving anti-rotation and eliminating the rotation of the pallet assembly 1. Smooth loading of weights is achieved.

The screw lift mounting plate 24 provided at the lower end of the shaft hole 31 is used to install the screw lift 23. The servo motor 21 is driven by the coupling 22 to cause the lifting screw 231 of the screw lift 23 to rise in the shaft hole 31. Or downward, when the lifting screw 231 rises, the lifting screw 231 passes through the shaft hole 31 , and the arc surface at the top of the lifting screw 231 resists the bottom surface of the spline shaft 141 of the ball spline 14 , pushing the pallet assembly 1 to move upward; when the lifting screw 231 descends, the gravity of the upper pallet assembly 1 causes the spline shaft 141 to fall downward.

The advantage of this utility model is that the pallet assembly rises or falls in the shaft hole through ball splines. The steel balls of the ball splines are close to the key grooves on the spline shaft, and can rise and fall smoothly without the need for external limiting devices. Rotation offset, simple structure and small size; the pallet assembly is equipped with a load cell, which can read the test force value in real time, which is convenient and fast; the servo motor has high precision and runs smoothly, and controls the lifting screw to move smoothly and accurately in the shaft hole Internal lifting; the top of the lifting screw is an arc surface, which reduces the contact area with the spline shaft of the ball spline, further preventing the rotation of the spline shaft caused by the rotation of the lifting screw.

Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we have described are only illustrative and are not used to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention shall be covered by the scope of protection of the claims of the present invention.

Claims (7)

1. Lifting mechanism suitable for dead weight type hardness machine has dynamometry function, its characterized in that: comprises a cross beam, a tray assembly and a lifting system,

the outer end of the cross beam is arranged on a frame of the hardness machine, and a through shaft hole is formed in the center of the cross beam;

the tray assembly comprises a tray, a force transducer and a ball spline, wherein the force transducer is arranged at the bottom of the tray, the force transducer is fixed at the upper end of a spline shaft of the ball spline, and a spline nut of the ball spline is fixedly arranged at the upper end of the shaft hole;

the lifting system comprises a servo motor and a screw rod lifter, the screw rod lifter is arranged at the lower end of the shaft hole, the servo motor drives a lifting screw rod of the screw rod lifter to ascend or descend in the shaft hole, and the lifting screw rod ascends and jacks up a spline shaft of the ball spline.

2. A lifting mechanism with force measuring function for a dead weight type hardness machine as claimed in claim 1, wherein: the lifting system further comprises a coupler, and the servo motor is connected with the screw rod lifter through the coupler.

3. A lifting mechanism with force measuring function for a dead weight type hardness machine as claimed in claim 2, wherein: the tray assembly further comprises a ball spline mounting sleeve, wherein the ball spline mounting sleeve is arranged at the upper end of the shaft hole and used for fixing a spline nut of the ball spline.

4. A lifting mechanism with force measuring function for a dead weight type hardness machine as claimed in claim 3, wherein: the tray assembly further comprises a sensor connecting plate, the upper end of the sensor connecting plate is fixed with the force transducer, and the lower end of the sensor connecting plate is fixedly arranged at the upper end of the spline shaft of the ball spline.

5. A lifting mechanism with force measuring function for a dead weight type hardness machine as claimed in claim 2, wherein: the lifting system further comprises a screw rod lifter mounting plate, wherein the screw rod lifter mounting plate is arranged at the lower end of the shaft hole and used for mounting the screw rod lifter.

6. A lifting mechanism with force measuring function for a dead weight type hardness machine as claimed in claim 4 or 5, wherein: the top end of the lifting screw rod is an arc surface.

7. The lifting mechanism with force measuring function for a dead weight type hardness machine as claimed in claim 6, wherein: the angular clearance of the ball spline is zero.