Length change detection device

Abstract

The utility model discloses a length change detection device which comprises a chain, two ends of the chain are connected with a lifting motion unit, and the chain comprises a fixed end fixedly connected with the lifting motion unit and a movable end slidably connected with the lifting motion unit. A chain is arranged in the lifting motion unit, a compression spring is arranged between the movable end of the chain and the lifting motion unit, a sensor is arranged at the position, close to the movable end of the chain, of the lifting motion unit, and a sensing piece matched with the sensor is arranged at the movable end of the chain. The extension of the chain can be absorbed through the compression spring, the whole long strip of the chain can be adjusted in real time, connection through a shutdown means is not needed, then the use efficiency of equipment is improved, and the debugging and maintenance adjustment time is greatly shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission chains, in particular to a length change detection device. Background Art

[0002] Chains are commonly used transmission structures in the mechanical field. When using chains, they often need to be tensioned by a tensioning device to ensure that the chain is at an appropriate tightness.

[0003] The traditional chain tensioning device is a fixed tensioning mechanism that cannot automatically tighten as the chain wears and changes in length. Therefore, the chain will become looser after a long period of operation. At this time, the equipment needs to be stopped to manually adjust the tensioning device. The chain status detection device is a proximity switch that can only issue an alarm when the chain breaks. At this time, unavoidable losses have often been caused by the chain breakage. Utility Model Content

[0004] The purpose of the utility model is to provide a length change detection device to solve the problems raised in the above background technology.

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

[0006] A length change detection device comprises a chain, both ends of the chain are connected with lifting motion units, the chain comprises a fixed end fixedly connected to the lifting motion unit and a movable end slidably connected to the lifting motion unit;

[0007] A compression spring is arranged between the movable end of the chain and the lifting motion unit, a sensor is arranged at a position of the lifting motion unit close to the movable end of the chain, and a sensing sheet cooperating with the sensor is arranged on the movable end of the chain.

[0008] As a further solution of the utility model: the lifting motion unit includes a support plate and a first connecting plate and a second connecting plate arranged at both ends of the support plate, the fixed end of the chain is fixedly connected to the first connecting plate, and the movable end of the chain is movably connected to the second connecting plate.

[0009] As a further solution of the utility model: a first chain fixing piece is provided at the fixed end of the chain, and the first chain fixing piece is fixedly connected to the first connecting plate.

[0010] As a further solution of the utility model: the movable end of the chain is provided with a second chain fixing piece, the second chain fixing piece passes through the second connecting plate, a compression nut is threadedly connected to the second chain fixing piece, and the compression spring is located between the compression nut and the second connecting plate.

[0011] As a further solution of the utility model: a mounting plate is fixedly connected to the second connecting plate, and a waist-shaped hole for adjusting the relative position of the mounting plate and the second connecting plate is provided at the connection between the mounting plate and the second connecting plate, and the sensor is located at the lower end of the mounting plate.

[0012] As a further solution of the utility model: the chain is a double-row roller chain, and the two sub-chains of the double-row roller chain are respectively provided with a first sensor sensing piece and a second sensor sensing piece.

[0013] As a further solution of the utility model: the sensor adopts a U-shaped photoelectric sensor.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The present application provides a compression spring and pre-tightens the compression spring, so that the elongation of the chain can be absorbed by the compression spring, and the overall length of the chain can be adjusted in real time without stopping the machine to connect, thereby improving the use efficiency of the equipment and greatly reducing the speed regulation and maintenance adjustment time;

[0016] 2. This application can detect the change of chain length in real time by setting up induction plates and sensors, and thus can obtain the change of chain length at any time, and can issue an alarm before the chain breaks, thereby ensuring the safe operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the detection device of this embodiment;

[0018] In the figure: 1-lifting motion unit, 2-support plate, 3-first connecting plate, 4-second connecting plate, 5-first chain fixing piece, 6-second chain fixing piece, 7-compression nut, 8-compression spring, 9-chain, 10-mounting plate, 11-waist-shaped hole, 12-sensor, 13-first sensor sensing sheet, 14-second sensor sensing sheet. DETAILED DESCRIPTION

[0019] 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.

[0020] See also Figure 1In an embodiment of the utility model, a length change detection device includes a chain 9, and both ends of the chain 9 are connected with a lifting motion unit 1 to form an annular structure. The lifting motion unit 1 includes a support plate 2 and a first connecting plate 3 and a second connecting plate 4 arranged at both ends of the support plate 2. The chain 9 includes a fixed end fixedly connected to the lifting motion unit 1 and a movable end slidably connected to the lifting motion unit 1. In this embodiment, the fixed end of the chain 9 is fixedly connected to the first connecting plate 3, and the movable end of the chain 9 is movably connected to the second connecting plate 4.

[0021] The fixed end of the chain 9 is provided with a first chain fixing part 5, and the first chain fixing part 5 is fixedly connected to the first connecting plate 3. The movable end of the chain 9 is provided with a second chain fixing part 6, and the second chain fixing part 6 passes through the second connecting plate 4. A compression nut 7 is threadedly connected to the second chain fixing part 6. A compression spring 8 is provided between the movable end of the chain 9 and the lifting motion unit 1. In this embodiment, the compression spring 8 is located between the compression nut 7 and the second connecting plate 4.

[0022] A sensor 12 is provided at the position of the lifting motion unit 1 near the active end of the chain 9. The sensor 12 adopts a U-shaped photoelectric sensor. The second connecting plate 4 is fixedly connected with a mounting plate 10. A waist-shaped hole 11 for adjusting the relative position of the mounting plate 10 and the second connecting plate 4 is provided at the connection between the mounting plate 10 and the second connecting plate 4. The sensor 12 is located at the lower end of the mounting plate 10. A sensing sheet cooperating with the sensor 12 is provided at the active end of the chain 9. In this embodiment, the chain 9 is a double-row roller chain, and the two sub-chains of the double-row roller chain are respectively provided with a first sensor sensing sheet 13 and a second sensor sensing sheet 14.

[0023] When the utility model is in use, the relative position of the movable end of the chain 9 and the second connecting member 4 can be adjusted by rotating the compression nut 7, thereby adjusting the tightness of the chain 9, and the relative position of the sensor 12 can also be adjusted through the waist-shaped hole 11 on the mounting plate 10.

[0024] In actual use, due to the wear of the chain 9, the chain 9 will become loose, that is, the actual length of the chain 9 becomes. Under the push of the compression spring 8, the second chain fixing part 6 at the movable end of the chain 9 will move along the second connecting plate 4, thereby extending the compression spring 8. The elongated length of the chain 9 is absorbed by the spring to ensure that the chain can still be at an appropriate length. During this process, the sensor plate installed on the chain 9 will also move. During the movement of the sensor plate, it will be detected by the sensor 12, and then the change in chain length can be indirectly detected by the movement distance of the sensor plate. A warning can be issued as needed so that it can be replaced in time when necessary.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0026] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A length change detection device, comprising a chain (9), characterized in that: Both ends of the chain (9) are connected to a lifting motion unit (1), and the chain (9) comprises a fixed end fixedly connected to the lifting motion unit (1) and a movable end slidably connected to the lifting motion unit (1); A compression spring (8) is provided between the movable end of the chain (9) and the lifting motion unit (1); a sensor (12) is provided at a position of the lifting motion unit (1) close to the movable end of the chain (9); and a sensing sheet cooperating with the sensor (12) is provided on the movable end of the chain (9).

2. A length change detection device according to claim 1, characterized in that: The lifting motion unit (1) comprises a support plate (2) and a first connecting plate (3) and a second connecting plate (4) arranged at both ends of the support plate (2); the fixed end of the chain (9) is fixedly connected to the first connecting plate (3), and the movable end of the chain (9) is movably connected to the second connecting plate (4).

3. A length change detection device according to claim 2, characterized in that: A first chain fixing member (5) is provided at the fixed end of the chain (9), and the first chain fixing member (5) is fixedly connected to the first connecting plate (3).

4. A length change detection device according to claim 2, characterized in that: The movable end of the chain (9) is provided with a second chain fixing member (6), the second chain fixing member (6) passes through the second connecting plate (4), a compression nut (7) is threadedly connected to the second chain fixing member (6), and the compression spring (8) is located between the compression nut (7) and the second connecting plate (4).

5. A length change detection device according to claim 2, characterized in that: A mounting plate (10) is fixedly connected to the second connecting plate (4); a waist-shaped hole (11) for adjusting the relative position of the mounting plate (10) and the second connecting plate (4) is provided at the connection between the mounting plate (10) and the second connecting plate (4); and the sensor (12) is located at the lower end of the mounting plate (10).

6. A length change detection device according to claim 1, characterized in that: The chain (9) is a double-row roller chain, and the two sub-chains of the double-row roller chain are respectively provided with a first sensor sensing sheet (13) and a second sensor sensing sheet (14).

7. A length change detection device according to claim 1, characterized in that: The sensor (12) is a U-shaped photoelectric sensor.

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