Chain tensioning mechanism

Abstract

The utility model discloses a chain tensioning mechanism which comprises a machine frame, a driving mechanism, a driving chain wheel, a driven chain wheel, a transmission chain, a linear driving mechanism, a connecting support, a tensioning wheel and at least one brush assembly. The driving chain wheel is mounted on an output shaft of the driving mechanism; the driven chain wheel is rotationally arranged on the rack; the transmission chain is mounted outside the driving chain wheel and the driven chain wheel; the linear driving mechanism extends in the horizontal direction and is fixedly arranged on the rack, and the linear driving mechanism is provided with a moving block suitable for reciprocating horizontal motion; the connecting bracket is fixedly arranged on the moving block; the tensioning wheel is rotationally arranged on the connecting support, and the tensioning wheel is suitable for being driven by a moving block of the linear driving mechanism to be meshed with the transmission chain. The grillage machine chain tensioning device can achieve grillage machine chain tensioning, and meanwhile part of impurities attached to the chain are cleaned.

Description

TECHNICAL FIELD

[0001] The utility model relates to a chain tensioning mechanism belongs to grating machine technical field. BACKGROUND

[0002] The grating machine of the sewage treatment plant is the first process equipment of the sewage treatment process, mainly used for intercepting and removing large particle suspended solids, floating matter and fibrous impurities in sewage. The grating machine usually adopts a chain drive system to drive the cleaning mechanism to reciprocate, and the chain drives the cleaning rake to move along the surface of the grating, lifts and discharges the intercepted pollutants.

[0003] The chain is prone to plastic deformation and stretching under repeated tensile load, resulting in chain relaxation and transmission precision decline, which can easily cause frequent equipment failure and seriously affect the normal operation of the sewage treatment plant.

[0004] After searching the prior art, it is found that the Chinese patent with publication number CN216808183U discloses a grating machine chain tensioning structure. The patent achieves the effect of chain anti-looseness, but in actual use, it is found that during the operation of the grating machine chain drive system of the sewage treatment plant, impurities in the sewage are easily entangled on the chain, increasing the running resistance of the chain; at the same time, the particulate impurities such as silt are deposited in the joint gap of the chain, which can easily affect the normal operation of the chain. SUMMARY

[0005] The technical problem to be solved by the utility model is to overcome the defects of the prior art, and to provide a chain tensioning mechanism which can realize grating machine chain tensioning and simultaneously clean the impurities attached to the chain.

[0006] In order to solve the above technical problems, the technical scheme of the utility model is as follows: a chain tensioning mechanism, comprising:

[0007] a rack;

[0008] a drive mechanism fixedly arranged on the rack;

[0009] a driving sprocket installed on the output shaft of the drive mechanism;

[0010] a driven sprocket rotatably arranged on the rack;

[0011] a transmission chain wound around the driving sprocket and the driven sprocket;

[0012] a linear drive mechanism fixedly arranged on the rack along the horizontal direction, the linear drive mechanism being provided with a moving block adapted to reciprocate horizontally;

[0013] A connecting bracket fixedly arranged on the moving block;

[0014] A tensioning wheel rotatably arranged on the connecting bracket, the tensioning wheel being adapted to engage with the transmission chain under the driving of the moving block of the linear drive mechanism;

[0015] At least one brush assembly mounted on the connecting bracket, the brush assembly being adapted to abut against the transmission chain.

[0016] Further, the brush assembly comprises:

[0017] A brush shaft mounted on the connecting bracket;

[0018] A plurality of brush hairs arranged on the brush shaft in a circumferential direction and spaced apart in an axial direction.

[0019] Further, the brush assembly is provided with two.

[0020] Further, in order to better adjust the tension, the chain tensioning mechanism further comprises a pressure sensor and a controller, the pressure sensor being mounted between the moving block and the connecting bracket, the pressure sensor being provided with a sensing end;

[0021] The connecting bracket is fixedly arranged on the sensing end of the pressure sensor;

[0022] The tensioning wheel is rotatably arranged on the connecting bracket, the pressure sensor being adapted to detect the pressure of the transmission chain acting on the tensioning wheel and output a pressure signal;

[0023] The controller is electrically connected with the linear drive mechanism, the pressure sensor is electrically connected with the controller, and the controller is adapted to control the action of the linear drive mechanism according to the pressure signal of the pressure sensor.

[0024] Further, in order to adapt to different transmission chains, the chain tensioning mechanism further comprises a vertical drive mechanism fixedly arranged on the rack, the vertical drive mechanism being provided with a lifting block adapted to reciprocate up and down;

[0025] The moving block is mounted on the lifting block, and the vertical drive mechanism is adapted to drive the tensioning wheel to move in a vertical direction.

[0026] Further, a specific type of vertical drive mechanism is provided, which is a pneumatic cylinder or a hydraulic cylinder.

[0027] Further, the linear drive mechanism comprises:

[0028] A reciprocating driving mechanism is fixedly arranged on the frame, and is provided with a driving member;

[0029] A guide mechanism is fixedly arranged on the frame and arranged in parallel with the moving direction of the reciprocating driving mechanism, and is provided with a sliding guide member;

[0030] The moving block is simultaneously mounted on the driving member and the sliding guide member, and the reciprocating driving mechanism is adapted to drive the moving block to move along the moving path of the sliding guide member through the driving member.

[0031] By adopting the above technical scheme, the chain tensioning mechanism has the following beneficial effects:

[0032] In the chain tensioning mechanism, when the transmission chain is slack during operation, the linear driving mechanism drives the moving block to move towards the transmission chain, and drives the tensioning wheel to apply tensioning force to the transmission chain; when the transmission chain is over-tensioned, the moving block moves away from the transmission chain, and the tensioning force is reduced. Meanwhile, the brush assembly is mounted on the connecting bracket, the brush assembly abuts against the transmission chain, and the brush assembly cleans the transmission chain while the transmission chain is running, so that dirt and sundries attached to the surface of the transmission chain are removed.

[0033] In addition, the pressure sensor is mounted between the moving block and the connecting bracket, the pressure sensor detects the pressure of the transmission chain acting on the tensioning wheel and outputs a pressure signal, and the controller controls the action of the linear driving mechanism according to the pressure signal of the pressure sensor, so that the tensioning force is adjusted.

[0034] In summary, the chain tensioning mechanism realizes tensioning adjustment and synchronous cleaning of the transmission chain, improves the operation reliability and maintenance convenience of the grating machine, and can be stably operated for a long time. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is a schematic view of the three-dimensional structure of the chain tensioning mechanism. DETAILED DESCRIPTION

[0036] In order to make the content of the chain tensioning mechanism more easily and clearly understood, the chain tensioning mechanism will be further described in detail below according to specific embodiments and in combination with the drawings.

[0037] As shown in the drawings, Figure 1 A chain tensioning mechanism comprises:

[0038] A frame 1;

[0039] A driving mechanism 2 is fixedly arranged on the frame 1;

[0040] A driving sprocket 3 is installed on the output shaft 21 of the driving mechanism 2.

[0041] A driven sprocket is rotatably arranged on the frame 1.

[0042] A transmission chain 4 is arranged around the driving sprocket 3 and the driven sprocket.

[0043] A linear driving mechanism 5 is fixedly arranged on the frame 1 in a horizontal direction, and is provided with a moving block 51 adapted to reciprocate horizontally.

[0044] A connecting bracket 6 is fixedly arranged on the moving block 51.

[0045] A tensioning wheel 7 is rotatably arranged on the connecting bracket 6, and is adapted to mesh with the transmission chain 4 under the driving of the moving block 51 of the linear driving mechanism 5.

[0046] Two brush assemblies 8 are installed on the connecting bracket 6, and are adapted to abut against the transmission chain 4.

[0047] In the embodiment, as shown in Figure 1 , when the transmission chain 4 is slack during operation, the linear driving mechanism 5 drives the moving block 51 to move towards the transmission chain 4, and drives the tensioning wheel 7 to apply a tensioning force to the transmission chain 4; when the transmission chain 4 is over-tensioned, the moving block 51 moves away from the transmission chain 4, and reduces the tensioning force. Meanwhile, the brush assemblies 8 are installed on the connecting bracket 6, and abut against the transmission chain 4, and clean the transmission chain 4 while the transmission chain 4 is running, and remove dirt and sundries attached to the surface of the transmission chain 4.

[0048] Specifically, as shown in Figure 1 , the brush assembly 8 comprises:

[0049] A brush shaft is installed on the connecting bracket 6.

[0050] A plurality of bristles are arranged on the brush shaft in a circumferential direction, and are arranged in an axial direction.

[0051] Specifically, as shown in Figure 1 , the brush assembly 8 is provided with two.

[0052] In the embodiment, as shown in Figure 1As shown, two brush assemblies 8 are respectively arranged on the two sides of the tensioning wheel 7, and the brush assembly 8 in the embodiment is fixed on the connecting bracket 6. When the transmission chain 4 runs, the bristles of the brush assembly 8 are in contact with the surface of the transmission chain 4 to clean the transmission chain 4. Since the bristles have a certain flexibility, they can fit the surface profile of the transmission chain 4 to remove dirt and debris attached to the transmission chain 4. The arrangement of the two brush assemblies 8 enables the transmission chain 4 to be cleaned on both sides when passing through the area of the tensioning wheel 7.

[0053] In some embodiments, the number of brush assemblies 8 is not limited to two and can be set according to specific needs. In addition, the brush shaft can be rotatably installed on the connecting bracket 6, and a sprocket is installed on the connecting shaft of the brush shaft and the tensioning wheel 7, respectively. Through the chain connection, rotation can be generated under the drive of the transmission chain 4.

[0054] Specifically, as shown in Figure 1 The chain tensioning mechanism further includes a pressure sensor 9 and a controller. The pressure sensor 9 is installed between the moving block 51 and the connecting bracket 6, and the pressure sensor 9 is provided with a sensing end;

[0055] The connecting bracket 6 is fixedly arranged on the sensing end of the pressure sensor 9;

[0056] The tensioning wheel 7 is rotatably arranged on the connecting bracket 6, and the pressure sensor 9 is adapted to detect the pressure of the transmission chain 4 acting on the tensioning wheel 7 and output a pressure signal;

[0057] The controller is electrically connected with the linear drive mechanism 5, and the pressure sensor 9 is electrically connected with the controller. The controller is adapted to control the action of the linear drive mechanism 5 according to the pressure signal of the pressure sensor 9.

[0058] In the embodiment, as shown in Figure 1As shown, the controller adopts a PLC controller or a single-chip microcomputer controller, and a pressure threshold parameter is arranged inside the controller. When the received pressure signal exceeds the preset upper threshold, the controller outputs a control signal to the linear drive mechanism 5, so that the moving block 51 moves away from the transmission chain 4, reducing the tensioning force of the tensioning wheel 7 on the transmission chain 4. When the pressure signal is lower than the preset lower threshold, the controller controls the linear drive mechanism 5 to move the moving block 51 towards the transmission chain 4, increasing the tensioning force of the tensioning wheel 7 on the transmission chain 4. In addition, in order to avoid the controller from making a wrong judgment due to an external load during the operation of the grating machine, the controller can suspend the automatic control of the linear drive mechanism 5 during the normal operation of the grating machine, and change to a manual control mode or keep the current tensioning state. In addition, since the bristles of the brush assembly 8 are soft, the reaction force generated when the bristles contact the transmission chain 4 is small. When this contact force is transmitted to the pressure sensor 9 through the connecting bracket 6, the value of the contact force is small relative to the tensioning force of the transmission chain 4, and the influence on the measurement accuracy of the pressure sensor 9 can be ignored.

[0059] Specifically, as shown in Figure 1 The chain tensioning mechanism further comprises a vertical drive mechanism 10 fixedly arranged on the rack 1, and the vertical drive mechanism 10 is provided with a lifting block adapted to move up and down.

[0060] The moving block 51 is installed on the lifting block, and the vertical drive mechanism 10 is adapted to drive the tensioning wheel 7 to move in the vertical direction.

[0061] Specifically, as shown in Figure 1 The vertical drive mechanism 10 is a pneumatic cylinder.

[0062] In some embodiments, when the vertical drive mechanism 10 is a hydraulic cylinder, the cylinder body of the hydraulic cylinder is also fixed on the rack 1, the piston rod of the hydraulic cylinder serves as the lifting block, and the moving block 51 is installed at the end of the piston rod.

[0063] The installation height of the transmission chain 4 may be different in different installation environments or different models of the grating machine. The vertical drive mechanism 10 can adjust the vertical position of the tensioning wheel 7 to align the tensioning wheel 7 with the transmission chain 4.

[0064] Specifically, as shown in Figure 1 The linear drive mechanism 5 comprises:

[0065] a reciprocating drive mechanism fixedly arranged on the rack 1, the reciprocating drive mechanism being provided with a driving member;

[0066] a guide mechanism fixedly arranged on the rack 1 and arranged in parallel with the moving direction of the reciprocating drive mechanism, the guide mechanism being provided with a sliding guide member;

[0067] The moving block 51 is mounted on the driving member and the sliding guide at the same time, and the reciprocating driving mechanism is adapted to drive the moving block 51 to move along the moving path of the sliding guide through the driving member.

[0068] In the embodiment, as shown in the figure, the reciprocating driving mechanism in the embodiment adopts a sealed electric push rod, and the shell of the electric push rod adopts a sealed structure. Figure 1 Of course, in some embodiments, a hydraulic cylinder or an air cylinder can also be used as the reciprocating driving mechanism.

[0069] The guide mechanism comprises a linear guide pair composed of a guide rail and a sliding block, the guide rail is fixedly installed on the rack 1 through bolts, and the axis direction of the guide rail is parallel to the movement direction of the reciprocating driving mechanism.

[0070] The above-described specific embodiments further specifically describe the technical problems, technical solutions and beneficial effects solved by the utility model, and it should be understood that the above-described specific embodiments are only for the utility model and are not used for limiting the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A chain tensioning mechanism, characterized in that, include: Rack (1); A drive mechanism (2) is fixedly mounted on the frame (1); A drive sprocket (3) is mounted on the output shaft (21) of the drive mechanism (2); Driven sprocket, the driven sprocket being rotatably mounted on the frame (1); A drive chain (4) is wound around the drive sprocket (3) and the driven sprocket; A linear drive mechanism (5) is fixedly mounted on the frame (1) in a horizontal direction. The linear drive mechanism (5) is provided with a moving block (51) suitable for reciprocating horizontal motion. A connecting bracket (6) is fixedly mounted on the movable block (51); The tension wheel (7) is rotatably mounted on the connecting bracket (6) and is adapted to mesh with the transmission chain (4) under the drive of the moving block (51) of the linear drive mechanism (5). At least one brush assembly (8) is mounted on the connecting bracket (6) and is adapted to abut against the drive chain (4).

2. The chain tensioning mechanism according to claim 1, characterized in that, The brush assembly (8) includes: A brush shaft, which is mounted on the connecting bracket (6); Multiple bristles are arranged circumferentially around the brush shaft and spaced apart axially.

3. The chain tensioning mechanism according to claim 1, characterized in that, The brush assembly (8) has two parts.

4. The chain tensioning mechanism according to claim 1, characterized in that, It also includes a pressure sensor (9) and a controller, wherein the pressure sensor (9) is installed between the movable block (51) and the connecting bracket (6), and the pressure sensor (9) is provided with a sensing end; The connecting bracket (6) is fixedly mounted on the sensing end of the pressure sensor (9); The tension wheel (7) is rotatably mounted on the connecting bracket (6), and the pressure sensor (9) is adapted to detect the pressure of the transmission chain (4) acting on the tension wheel (7) and output a pressure signal; The controller is electrically connected to the linear drive mechanism (5), and the pressure sensor (9) is electrically connected to the controller. The controller is adapted to control the operation of the linear drive mechanism (5) according to the pressure signal of the pressure sensor (9).

5. The chain tensioning mechanism according to claim 1, characterized in that, It also includes a vertical drive mechanism (10), which is fixedly mounted on the frame (1) and is provided with a lifting block suitable for reciprocating up and down. The movable block (51) is mounted on the lifting block, and the vertical drive mechanism (10) is adapted to drive the tension wheel (7) to move in the vertical direction.

6. The chain tensioning mechanism according to claim 5, characterized in that, The vertical drive mechanism (10) is a pneumatic cylinder or a hydraulic cylinder.

7. The chain tensioning mechanism according to claim 1, characterized in that, The linear drive mechanism (5) includes: A reciprocating drive mechanism is fixedly mounted on the frame (1) and the reciprocating drive mechanism is provided with a drive component; A guiding mechanism is fixedly mounted on the frame (1) and is arranged parallel to the moving direction of the reciprocating drive mechanism. The guiding mechanism is provided with a sliding guide. The movable block (51) is simultaneously mounted on the driving member and the sliding guide member, and the reciprocating drive mechanism is adapted to drive the movable block (51) to move along the moving path of the sliding guide member through the driving member.

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