Grinding machine belt tensioning device and method

Abstract

The invention belongs to the technical field of grinding machine equipment, and particularly relates to a grinding machine belt tensioning device and method.The grinding machine belt tensioning device comprises a belt, a driving belt wheel, a driven belt wheel, a motor and a hydraulic device; the driving belt wheel is installed at the output end of the motor, and the motor is installed on the sliding table. A base is arranged below the sliding table, the base is installed on the rack, two supports are installed on the base at intervals, a plurality of transverse rods are fixedly connected between the two supports, sliding groove holes are formed in the positions, corresponding to the transverse rods, of the sliding table, and the sliding table is in sliding connection with the transverse rods through the sliding groove holes; the hydraulic device can push the sliding table to slide along the transverse rod. Compared with the prior art, the device has the advantages and positive effects that a belt of the grinding machine keeps a certain tension degree and vibration reduction of a machine frame of the grinding machine is realized in the working process at the same time; the sliding groove hole of the sliding table and the cross rod consume vibration energy through friction damping, and the purpose of reducing vibration of the rack is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding machine equipment, and in particular relates to a grinding machine belt tensioning device and method. Background Art

[0002] Most grinders use a high-speed rotating grinding wheel for grinding, and the motor of the grinder drives the grinding wheel to rotate through a belt transmission mechanism to achieve grinding. The belt needs to maintain a certain tension to ensure that there is sufficient friction between the belt and the motor pulley and the grinding wheel pulley to avoid slipping and deviation. At the same time, the tensioning force cannot be too large, otherwise it will cause deformation of the transmission mechanism and directly lead to overload of the bearing, and generate a lot of heat. The increase in temperature will cause thermal expansion and deformation of related parts. The belt will also elongate significantly when it is heated, shortening the belt life and causing changes in the tension force. This will affect the smoothness of the transmission and shorten the life of the bearing and the transmission belt. Therefore, in order to ensure higher processing accuracy, belt tensioning progress and belt service life, it is necessary to design a belt tensioning mechanism.

[0003] In addition, the vibration of the grinding machine motor during operation will cause insufficient stability of the frame, which will cause vibration during the processing and cause vibration marks. Summary of the invention

[0004] The invention aims at the technical problems existing in the grinding machine processing process in the prior art and provides a grinding machine belt tensioning device and method.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a grinding machine belt tensioning device, the grinding machine includes a frame; the grinding machine belt tensioning device includes a belt, a driving pulley, a driven pulley, a motor and a hydraulic device; the driving pulley is installed at the output end of the motor, and the motor is installed on a sliding table; below the sliding table is a base, the base is installed on the frame, two brackets are installed on the base at intervals, and a plurality of cross bars are fixedly connected between the two brackets, and the sliding table and the cross bar are provided with slide slot holes at corresponding positions, and the sliding table is slidably connected to the cross bar through the slide slot holes; the hydraulic device can push the sliding table to slide along the cross bar (8).

[0006] Preferably, the number of the cross bars is two, and the two cross bars are cylindrical structures with the same diameter.

[0007] Preferably, the inner diameter of the slide slot hole is 0.02-0.03 mm larger than the outer diameter of the cross bar.

[0008] Preferably, the axis of the hydraulic device is parallel to the cross bar; the two brackets are bracket one and bracket two respectively.

[0009] Preferably, the hydraulic device comprises a piston push rod, which passes through the bracket one and the sliding platform in sequence, the piston push rod is fixedly connected to the bracket one, and the sliding platform is provided with a through hole for the piston push rod to pass through; an oil sealing block is installed at the end of the through hole away from the bracket one, and the oil sealing block can seal the end of the through hole; A horizontal oil passage is provided in the piston push rod, and an oil chamber is formed between the end of the oil passage away from the bracket and the oil sealing block; an internal threaded hole is provided at the end of the oil passage away from the oil chamber; an oil cap is connected to the internal thread of the internal threaded hole; the oil cap is externally connected to a hydraulic pipeline, and a pressure regulating valve is installed on the hydraulic pipeline.

[0010] Preferably, a slot hole is provided at a position on the inner side of the second bracket corresponding to the oil sealing block, and the slot hole can cooperate with the oil sealing block.

[0011] Preferably, the grinding machine further comprises a grinding wheel, and the driving pulley drives the driven pulley and the grinding wheel to rotate via a belt.

[0012] Preferably, the elevations of the centers of the driving pulley and the driven pulley are equal or different.

[0013] A method for tensioning a grinder belt, utilizing the grinder belt tensioning device to tension the grinder belt and achieve vibration reduction of the grinder, comprising the following contents: before the grinder starts working and during the operation of the grinder, the hydraulic device is subjected to constant pressure control, oil enters the oil storage chamber of the hydraulic device, the oil in the oil storage chamber applies thrust to the sliding table through the oil sealing block to tension the belt; at the same time, the slide slot hole and the cross bar of the sliding table form a friction pair to reduce the vibration of the grinder.

[0014] Preferably, during the belt tensioning process before the grinder starts working, the oil in the oil containing chamber pushes the oil sealing block and the sliding table to move in a direction away from the bracket until the belt is tensioned under the set constant pressure; during the operation of the grinder, when the belt heats up and expands, the oil in the oil containing chamber pushes the oil sealing block and the sliding table to move in a direction away from the bracket, so the belt remains tensioned under the set constant pressure.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are: (1) The present invention simultaneously achieves maintaining a certain tension of the belt during the operation of the grinder and reducing vibration of the grinder frame; (2) The present invention designs a hydraulic device suitable for pushing the sliding table, and the hydraulic device does not occupy the external space of the base; before the grinder starts working and during the operation of the grinder, the hydraulic device is controlled to have a constant pressure, and the oil in the oil chamber applies a thrust to the sliding table through the oil sealing block to tighten the belt; at the same time, the slide slot hole and the cross bar of the sliding table form a friction pair to reduce the vibration of the grinder; (3) During the operation of the grinder, when the belt heats up and expands, the oil in the oil chamber pushes the oil seal block and the sliding table to move away from the bracket, so the belt remains taut under the set constant pressure and the tension remains unchanged; (4) The oil cap is connected to a hydraulic pipeline, and a pressure regulating valve is installed on the hydraulic pipeline. The above technical means can achieve constant pressure control of the hydraulic device; (5) The slide slot holes and crossbars of the sliding table consume vibration energy through friction damping, thereby achieving the purpose of reducing vibration of the frame; (6) The present invention ensures constant belt tension by controlling the hydraulic device at constant pressure, thereby eliminating a complex belt tension control system (for example, a belt tension control system including a piezoelectric sensor, an angle encoder, a comparator, a controller and an actuator), and achieving unexpected technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following is a brief introduction to the drawings required for describing the embodiment: Figure 1 Schematic diagram of the belt tensioning device of the grinding machine in Example 2; Figure 2 Illustration of the sliding table, bracket and motor in the belt tensioning device of the grinder Figure 1 ; Figure 3 Illustration of the sliding table, bracket and motor in the belt tensioning device of the grinder Figure 2 ; Figure 4 Illustration of the sliding table, bracket and motor in the belt tensioning device of the grinder Figure 3 ; Figure 5 Illustration of the sliding table, bracket and motor in the belt tensioning device of the grinder Figure 4 ; Figure 6 Illustration of the sliding table, bracket and motor in the belt tensioning device of the grinder Figure 5 ; Figure 7 It is a longitudinal cross-sectional view of the hydraulic device in the belt tensioning device of the grinding machine.

[0017] Description of reference numerals: 1. Frame, 2. Motor, 3. Driven pulley, 4. Grinding wheel, 5. Bracket, 6. Base, 7. Sliding table, 8. Crossbar, 9. Driving pulley; 10. Hydraulic device, 101. Internal threaded hole, 102. Oil channel, 103. Oil chamber, 104. Piston push rod; 11. Oil seal block, 12. Belt, 13. Oil cap. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0020] Example 1 Combine the following Figure 2-Figure 7 The belt tensioning device for a grinding machine in Example 1 is further described. The grinding machine includes a frame 1, and the belt tensioning device for the grinding machine includes a belt 12, a driving pulley 9, a driven pulley 3, a motor 2, and a hydraulic device 10. Figure 2 As shown, the driving pulley 9 is installed at the output end of the motor 2, and the motor 2 is installed on the sliding table 7.

[0021] like Figure 2-Figure 6 As shown, there is a base 6 below the sliding platform 7, and the base 6 is installed on the frame 1. Two brackets 5 are installed on the base 6 at intervals, and a plurality of cross bars 8 are fixedly connected between the two brackets 5. Slide slot holes are opened at corresponding positions of the sliding platform 7 and the cross bars 8, and the sliding platform 7 is slidably connected to the cross bars 8 through the slide slot holes; the hydraulic device 10 can push the sliding platform 7 to slide along the cross bars 8.

[0022] like Figure 2-Figure 6 As shown, there are two cross bars 8, and the two cross bars 8 are cylindrical structures with the same diameter. The inner diameter of the chute hole is 0.02-0.03 mm larger than the outer diameter of the cross bar 8.

[0023] like Figure 2-Figure 7 As shown, the axis of the hydraulic device 10 is parallel to the crossbar 8; the two brackets 5 are bracket 1 and bracket 2 respectively. The hydraulic device 10 includes a piston push rod 104, which passes through bracket 1 and the sliding platform 7 in sequence. The piston push rod 104 is fixedly connected to bracket 1 (the piston push rod 104 is stationary, and the sliding platform 7 can slide relative to the piston push rod 104). The sliding platform 7 is provided with a through hole for the piston push rod 104 to pass through; an oil sealing block 11 is installed at the end of the through hole away from bracket 1, and the oil sealing block 11 can block the end of the through hole.

[0024] like Figure 7 As shown, a sealing ring is installed on the side of the oil sealing block 11 close to the sliding platform 7, and the oil sealing block 11 is bolted to the side of the sliding platform 7 close to the bracket 2. A sealing ring is also installed on the end of the piston push rod 104 close to the bracket 2.

[0025] like Figure 7As shown, a horizontal oil passage 102 is provided in the piston push rod 104, and an oil chamber 103 is formed between the end of the oil passage 102 away from the bracket 1 and the oil sealing block 11; an internal threaded hole 101 is provided at the end of the oil passage 102 away from the oil chamber 103; an oil cap 13 is connected to the internal thread of the internal threaded hole 101; the oil cap 13 is externally connected to a hydraulic pipeline, and a pressure regulating valve is installed on the hydraulic pipeline.

[0026] A three-way solenoid valve is installed on the hydraulic pipeline external to the oil cap 13. The inlet and reversing port of the three-way solenoid valve are connected to the oil pump and the oil tank through pipelines respectively, and the outlet of the three-way solenoid valve is connected to the oil passage 102. The above-mentioned pressure regulating valve is installed on the pipeline between the inlet of the three-way solenoid valve and the oil pump. When the oil chamber 103 is filled with oil, the oil pump is connected to the oil passage 102; when the oil chamber 103 is discharged with oil, the oil tank is connected to the oil passage 102.

[0027] like Figure 4 As shown, a slot hole is provided at a position on the inner side of the second bracket corresponding to the oil sealing block 11 , and the slot hole can cooperate with the oil sealing block 11 .

[0028] The grinding machine further comprises a grinding wheel 4 , a driven pulley 3 is coaxial with the grinding wheel 4 , and a driving pulley 9 drives the driven pulley 3 and the grinding wheel 4 to rotate through a belt 12 .

[0029] In this embodiment, the centers of the driving pulley 9 and the driven pulley 3 are at the same elevation.

[0030] A method for tensioning a grinding machine belt, using the above-mentioned grinding machine belt tensioning device to tension the grinding machine belt and achieve grinding machine vibration reduction, includes the following contents: Before the grinder starts working and during the operation of the grinder, the hydraulic device 10 is controlled at a constant pressure, oil enters the oil chamber 103, and the oil in the oil chamber 103 applies a thrust to the sliding table 7 through the oil sealing block 11 to tighten the belt 12; at the same time, the slide slot hole and the cross bar 8 of the sliding table 7 form a friction pair to reduce the vibration of the grinder.

[0031] When the belt 12 is tensioned before the grinder starts working, the oil in the oil chamber 103 pushes the oil sealing block 11 and the sliding table 7 to move in a direction away from the bracket until the belt 12 is tensioned under a set constant pressure.

[0032] During the operation of the grinding machine, when the belt 12 heats up and expands, the oil in the oil chamber 103 pushes the oil sealing block 11 and the sliding table 7 to move in a direction away from the bracket, so the belt 12 is kept taut under the set constant pressure.

[0033] Example 2 The difference between this embodiment and embodiment 1 is: Figure 1 As shown, the elevations of the centers of the driving pulley 9 and the driven pulley 3 are different.

[0034] Since the length of the grinding machine belt is generally between 500mm and 5000mm, the length of the belt 12 changes within 3mm before and after the belt 12 is tensioned, and the angle between the center point connection line of the driving pulley 9 and the driven pulley 3 and the horizontal line can be regarded as unchanged. In this way, when the hydraulic device 10 is controlled at a constant pressure, the tension of the belt 12 remains unchanged.

[0035] Example 3 The difference between this embodiment and the first embodiment is that the longitudinal section of the cross bar 8 is a rectangle.

[0036] The oil cap 13 is provided with an oil inlet pipe and an oil return pipe, both of which are provided with switch valves; the pressure regulating valve is provided on the oil inlet pipe. When the oil chamber 103 is supplied with oil, the switch valve on the oil inlet pipe is opened, and the switch valve on the oil return pipe is closed; when the oil chamber 103 is supplied with oil, the switch valve on the oil inlet pipe is closed, and the switch valve on the oil return pipe is opened.

[0037] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes for application in other fields. However, any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A belt tensioning device for a grinding machine, the grinding machine comprising a frame (1); characterized in that: The grinding machine belt tensioning device comprises a belt (12), a driving pulley (9), a driven pulley (3), a motor (2) and a hydraulic device (10); the driving pulley (9) is installed at the output end of the motor (2), and the motor (2) is installed on a sliding table (7); A base (6) is disposed below the sliding platform (7), and the base (6) is mounted on the frame (1). Two brackets (5) are installed on the base (6) at intervals, and a plurality of cross bars (8) are fixedly connected between the two brackets (5). Slide slot holes are provided at corresponding positions of the sliding platform (7) and the cross bars (8), and the sliding platform (7) is slidably connected to the cross bars (8) via the slide slot holes; the hydraulic device (10) can push the sliding platform (7) to slide along the cross bars (8).

2. The grinding machine belt tensioning device according to claim 1, characterized in that: The number of the cross bars (8) is two, and the two cross bars (8) are cylindrical structures with the same diameter.

3. The grinding machine belt tensioning device according to claim 2, characterized in that: The inner diameter of the slide slot hole is 0.02-0.03 mm larger than the outer diameter of the cross bar (8).

4. The grinding machine belt tensioning device according to claim 3, characterized in that: The axis of the hydraulic device (10) is parallel to the crossbar (8); the two brackets (5) are bracket one and bracket two respectively.

5. The grinding machine belt tensioning device according to claim 4, characterized in that: The hydraulic device (10) comprises a piston push rod (104), the piston push rod (104) passes through a bracket one and a sliding platform (7) in sequence, the piston push rod (104) is fixedly connected to the bracket one, and the sliding platform (7) is provided with a through hole for the piston push rod (104) to pass through; an oil sealing block (11) is installed at the end of the through hole away from the bracket one, and the oil sealing block (11) can seal the end of the through hole; A horizontal oil passage (102) is provided in the piston push rod (104); an oil chamber (103) is formed between the end of the oil passage (102) away from the bracket and the oil sealing block (11); an internal threaded hole (101) is provided at the end of the oil passage (102) away from the oil chamber (103); an oil cap (13) is connected to the internal thread of the internal threaded hole (101); the oil cap (13) is externally connected to a hydraulic pipeline, and a pressure regulating valve is installed on the hydraulic pipeline.

6. The grinding machine belt tensioning device according to claim 5, characterized in that: A slot hole is provided at a position on the inner side of the second bracket corresponding to the oil sealing block (11), and the slot hole can cooperate with the oil sealing block (11).

7. The grinding machine belt tensioning device according to claim 1, characterized in that: The grinding machine also includes a grinding wheel (4), and the driving pulley (9) drives the driven pulley (3) and the grinding wheel (4) to rotate through a belt (12).

8. The grinding machine belt tensioning device according to claim 7, characterized in that: The elevations of the centers of the driving pulley (9) and the driven pulley (3) are equal or unequal.

9. A grinding machine belt tensioning method, characterized in that: The grinder belt tensioning device according to claim 5 is used to tension the grinder belt and achieve grinder vibration reduction, including the following contents: Before the grinding machine starts working and during the working process of the grinding machine, the hydraulic device (10) is subjected to constant pressure control, oil is introduced into the oil storage chamber (103) of the hydraulic device (10), and the oil in the oil storage chamber (103) applies a thrust to the sliding table (7) through the oil sealing block (11) to tighten the belt (12); At the same time, the slide slot hole and the cross bar (8) of the sliding platform (7) form a friction pair to reduce vibration of the grinding machine.

10. The grinding machine belt tensioning method according to claim 9, characterized in that: When the belt (12) is tensioned before the grinding machine starts working, the oil in the oil chamber (103) pushes the oil sealing block (11) and the sliding table (7) to move in a direction away from the bracket until the belt (12) is tensioned at a set constant pressure; During operation of the grinding machine, when the belt (12) heats up and expands, the oil in the oil chamber (103) pushes the oil sealing block (11) and the sliding table (7) to move in a direction away from the bracket, so the belt (12) remains tensioned under a set constant pressure.

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