TWI499729B - Linear transmission with wear detection - Google Patents

Description

Linear actuator with wear detection

The invention relates to a linear transmission device, in particular to a linear transmission device with wear detection.

A linear actuator usually refers to a ball screw or a linear slide composed of a moving body, a long shaft and a rolling member, and the linear transmission moves in order to have precise positioning accuracy and high rigidity. There is a pre-pressure between the body, the long shaft and the rolling element, and the pre-pressure refers to the movement of the moving body, the long shaft and the rolling member when the linear transmission is unloaded, and the moving body is long. There is no gap between the shaft and the rolling element; when the linear transmission with pre-pressure is applied to the machine, the rigidity and positioning accuracy of the machine can be improved, so the workpiece can be processed with good quality. Linear actuators with pre-stress are very important core components for precision machining machines.

In view of the above, in order to prevent the pre-pressure of the linear actuator having the pre-pressure from disappearing, and the positioning accuracy and rigidity of the linear transmission are reduced, the US Patent No. 7,297,703 discloses a displacement meter (including contact type, non-contact). Type, LVDT, fiber type) The device for measuring the gap between the moving body, the long shaft and the rolling member, when the gap changes, it also means that the pre-pressure also changes, so the user can be notified immediately to stop the inspection to prevent The machine loses its precision and continues to process the workpiece, which results in poor quality of the workpiece. Seriously, the batch workpiece is scrapped. Therefore, the monitoring device has its existence. However, this monitoring device still has the following problems: Measuring instruments are very expensive, such as being installed on linear actuators, the cost is too high, and customer acceptance is not high.

The measurement method of such a structure is actually very difficult to manufacture, and the measured portion is easily interfered with foreign matter and damaged or the surface has oil stains attached, and the monitored data is actually different from the actual one.

In view of the above problems, the main object of the present invention is to develop a low-cost, high-accuracy wear detecting device for detecting whether the linear actuator loses pre-stress or has generated wear.

In order to achieve the above object, the present invention is a linear transmission device with wear detection, comprising: a long shaft, which is a long strip structure, the outer surface of the long shaft is provided with a rolling groove; and a moving body is provided a sleeve portion for the long shaft sleeve, the inner edge surface of the sleeve portion is provided with a rolling groove opposite to the rolling groove, the rolling groove and the rolling groove system form a load path; the plurality of rolling elements are disposed on the a load path; an abrasion detecting element is disposed on the moving body, the wear detecting element is composed of a magnetic body and an insulator, and one end of the magnetic body is disposed opposite to the outer surface of the long axis, and the end is defined as an adsorption end. And the insulator is disposed between the magnetic body and the moving body; an alarm module has two connecting ends electrically connected to the moving body and the magnetic body respectively; the adsorption end adsorbs the long axis and moves The wear iron scrap between the body and the rolling member controls whether the alarm module is turned on by the iron filings, such as the amount of iron filings between the magnetic body and the moving body is excessive to contact the magnetic body and the moving body , turning on the alarm module and touching The alarm module prompts warning signal.

Preferably, the moving body is provided with a mounting hole, the mounting hole is provided with an internal thread, and the outer edge surface of the insulator is provided with an external thread, and the insulating system is screwed to the mounting hole.

Preferably, the adsorption end of the magnetic body is disposed relative to the rolling groove.

Preferably, the alarm module comprises a power source and a warning component, the power source is electrically connected to the warning component, and the two terminals are output.

Therefore, according to the present invention, the magnetic body absorbs the iron scraps between the long shaft, the moving body and the rolling elements, and further determines whether wear is generated between the long shaft, the moving body and the rolling member. When the iron filings become more and more contact with the magnetic body and the moving body, that is, the alarm module is turned on, the linear transmission device quickly loses the precursor of the pre-pressure, so the alarm module sends a warning signal to inform the user to pay attention to the linear transmission. The pre-stress state of the device, and the wear detecting device of the present invention utilizes a low-cost magnetic body and a simple circuit design to achieve the purpose of actively informing whether the linear drive module is usable, and has improved the high cost of the prior art and because of the external The problem of the accuracy of the sensor in the oil or foreign matter is affected.

1‧‧‧ long axis

11‧‧‧ rolling groove

2‧‧‧Mobile

21‧‧‧Setting Department

211‧‧‧ rolling groove

41‧‧‧Insulator

42‧‧‧ magnetic body

421‧‧‧ adsorption end

5‧‧‧Rolling parts

6‧‧‧Connecting end

7‧‧‧ Iron filings

8‧‧‧Power supply

9‧‧‧Warning components

The first figure is a perspective system diagram of a linear transmission device with wear detection according to a first preferred embodiment of the present invention.

The second figure is a perspective assembled view of a linear transmission device with wear detection according to a first preferred embodiment of the present invention.

The third figure is a cross-sectional view of the linear transmission device with wear detection according to the first preferred embodiment of the present invention, and the warning module is not triggered.

The fourth figure is a cross-sectional view of the linear transmission device with wear detection according to the first preferred embodiment of the present invention, and the warning module has been triggered.

Figure 5 is a perspective view of a linear transmission device with wear detection according to a second preferred embodiment of the present invention.

The sixth figure is a linear transmission device with wear detection according to a second preferred embodiment of the present invention. Three-dimensional combination map.

Figure 7 is a cross-sectional view showing a linear transmission device with wear detection according to a second preferred embodiment of the present invention, the warning module being untriggered.

Figure 8 is a cross-sectional view showing a linear transmission device with wear detection according to a second preferred embodiment of the present invention, the warning module being triggered.

Referring to FIG. 1 to FIG. 4 , which is a first preferred embodiment of the present invention, the linear transmission device of the present embodiment is a ball screw, and the ball screw system includes: a long axis (1). In the long strip structure, the outer surface of the long shaft (1) is provided with a spiral rolling groove (11); and a moving body (2) is provided with a sleeve for the long shaft (1) ( 21) The sleeve portion (21) is a circular through hole, and the inner edge surface of the sleeve portion (21) is provided with a rolling groove (211) opposite to the rolling groove (11), and the rolling groove (11) And the rolling groove (211) constitutes a load path, the moving body (2) is provided with a mounting hole (22), the mounting hole (22) is provided with an internal thread in the embodiment; a plurality of rolling elements (5) Provided in the load path; a plurality of reflow members (3) are disposed on the moving body (2), which provides a rolling element (5) to circulate and recirculate; see the first and third figures, an wear detecting element ( 4), in this embodiment, it is composed of a magnetic body (42) and an insulator (41), the magnetic body (42) is a magnet, and the insulator (41) can be made of a material such as plastic or rubber. The outer edge of the insulator (41) is provided with an external thread, and the The edge body (41) is screwed to the mounting hole (22), and the outer surface of the magnetic body (42) is covered by the insulator (41). The magnetic body is known from the enlarged view of the third figure. (42) The insulator (41) is disposed between the mounting hole (22) of the moving body (2), and one end of the magnetic body (42) is disposed opposite to the outer surface of the long axis (1), and the end is defined as Adsorption end (421), in this real The adsorption end (421) is disposed relative to the rolling groove (11) of the long axis (1) because it is designed to directly absorb the worn iron chips (7); an alarm module, the alarm module includes In the embodiment, the warning component (9) is a warning light, a buzzer, etc., and the power source (8) is electrically connected to the warning component (9). The two ends (6) are electrically connected, and the two ends (6) are electrically connected to the moving body (2) and the magnetic body (42) respectively; and the adsorption end of the magnetic body (42) (421) Applying the wear iron scraps (7) between the long axis (1), the moving body (2) and the rolling member (5), and controlling whether the alarm module is turned on by the iron filings (7), such as The amount of iron filings (7) between the magnetic body (42) and the moving body (2) is increased to contact the magnetic body (42) and the moving body (2), and the alarm module is turned on and the alarm is triggered. The warning component (9) of the module prompts the warning signal, as shown in the fourth figure.

Referring to FIG. 5 to FIG. 8 , which is a second preferred embodiment of the present invention, the linear transmission component of the embodiment is a linear slide, except that the rolling groove (11) of the long axis (1) is The linear extension is arranged, and the moving body (2) is a U-shaped structure, so that the sleeve portion (21) is a groove-like structure, and the configuration of the remaining components is the same as that of the first preferred embodiment, so This is not repeated here.

In view of the above, the "industrial availability" of the present invention should be unquestionable. In addition, the feature technology disclosed in the embodiment of the present invention has not been seen in publications before the application, nor has it been disclosed. The use of not only has the fact that the effect is improved as described above, but also has an additional effect that cannot be neglected. Therefore, the "novelty" and "progressiveness" of the present invention are in compliance with the patent regulations, and the application for the invention patent is filed according to law. Please give us a review and grant a patent as soon as possible.

The above description of the embodiments is intended to be illustrative of the invention and is not intended to limit the invention. category.

1‧‧‧ long axis

11‧‧‧ rolling groove

2‧‧‧Mobile

21‧‧‧Setting Department

211‧‧‧ rolling groove

22‧‧‧Installation holes

3‧‧‧Return parts

41‧‧‧Insulator

42‧‧‧ magnetic body

421‧‧‧ adsorption end

5‧‧‧Rolling parts

6‧‧‧Connecting end

7‧‧‧ Iron filings

8‧‧‧Power supply

9‧‧‧Warning components

Claims (4)

A linear transmission device with wear detection includes: a long shaft, which is a long strip structure, the outer surface of the long shaft is provided with a rolling groove; and a moving body is provided with a sleeve for the long shaft sleeve a rolling groove corresponding to the rolling groove, the rolling groove and the rolling groove form a load path; a plurality of rolling elements are disposed on the load path; and an abrasion detecting element is provided In the moving body, the wear detecting element is composed of a magnetic body and an insulator, and one end of the magnetic body is disposed opposite to the outer surface of the long axis, and the end is defined as an adsorption end, and the magnetic body and the moving body are The insulator is provided with an alarm module having two connecting ends electrically connected to the moving body and the magnetic body respectively; the adsorption end adsorbs the wear iron scraps between the long shaft, the moving body and the rolling member Controlling whether the alarm module is turned on by the iron filings, and triggering the alarm module to prompt the warning signal. The linear transmission device with wear detection according to claim 1, wherein the moving body is provided with a mounting hole, the mounting hole is provided with an internal thread, the outer edge surface of the insulator is provided with an external thread, and the insulating system is screwed In the mounting hole. The linear transmission device with wear detection according to claim 1, wherein the adsorption end of the magnetic body is disposed relative to the rolling groove. The linear transmission device with wear detection according to claim 1, wherein the alarm module comprises a power source and a warning component, the power source is electrically connected to the warning component, and the two terminals are output.