Device for detecting rotating speed of cutting element of mowing machine

Abstract

The utility model discloses a hay mower cutting element rotating speed detection device which is provided with a test board, a hay mower front wheel bearing mechanism, a hay mower rear wheel bearing mechanism, a pressing and fixing mechanism and a laser test instrument, and front wheels and rear wheels of a detected hay mower are borne through the hay mower front wheel bearing mechanism and the hay mower rear wheel bearing mechanism. The tested mower is pressed and fixed through the pressing and fixing mechanism, so that the stability and the safety of the tested mower in the testing process are ensured, and the cutting element of the tested mower is aligned with the hollow hole of the hollow plate, and therefore, the mower can be tested when the tested mower simulates a state that front and rear wheels are both grounded when the tested mower works normally; a laser testing instrument is used for aligning the cutting element of the mower to be tested through the hollow hole in an unshielded manner so as to accurately measure the rotating speed without interference, so that the accuracy, the high efficiency and the safety of the rotating speed detection of the cutting element are ensured; the problem that the rotating speed of a cutting element is difficult to accurately measure due to the fact that the mower is manually held to trigger an off-ground automatic protection mechanism is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lawn mower performance detection device, specifically a lawn mower cutting element rotating speed detection device. BACKGROUND

[0002] In recent years, intelligent technology has penetrated into people's life. As a representative of garden electric tools, battery-powered intelligent lawn mower is a symbol of the high integration of electric tools and intelligent technology. Intelligent lawn mower is convenient for people's daily life, not only saves manpower and material resources, but also realizes high work efficiency.

[0003] In lawn maintenance operation, the rotating speed of the cutting element of the lawn mower is a key factor directly affecting the mowing efficiency. The higher the rotating speed, the higher the efficiency of cutting the lawn. Considering safety factors, when the lawn robot encounters obstacles, tilts, is lifted by humans or the protection mechanism is accidentally opened / moved out during work, the built-in protection mechanism will immediately start, requiring the cutting element to stop moving within 2 seconds. If it cannot stop completely within 2 seconds, the rotating energy of the cutting element during braking must be strictly controlled within 0.1 joules to ensure that there is no potential risk of personnel injury caused by high-speed rotation.

[0004] The existing lawn mower is equipped with an electronic balance sensor at the bottom to improve safety. The sensor can monitor the running state of the lawn mower in real time and automatically cut off the power source when an abnormal situation is detected (such as the lawn mower being suspended in the air), so that the cutting element stops rotating and potential dangers are avoided. However, this design feature also brings challenges to the performance testing of the lawn mower. In the calculation test of the rotational kinetic energy of the cutting element according to GB / T 4706.110-2021 "Safety of household and similar electrical appliances Part 2 Special requirements for intelligent lawn mowers powered by batteries", Appendix AA, due to the off-ground protection mechanism of the lawn mower, it is impossible to directly measure the rotating speed of the cutting element of the lawn mower. One method is to disable the off-ground protection mechanism program of the manufacturer and then test. However, this way of sending back and forth samples consumes time and cost. Therefore, it is very important to develop a device that can measure the rotating speed of the cutting element.

[0005] In the prior art, the performance testing of the lawn robot mainly focuses on the overall performance testing of the lawn mower, the cutting assembly device of the lawn mower, the structure and effect of the cutting element, etc. These schemes are as follows:

[0006] Scheme one, a kind of lawn mower performance test platform (CN 109975037 A) applied by Suzhou University The invention patent includes rack, is provided with test module and two slopes on the rack, test module specifically includes: wheel speed test unit, for testing the wheel speed of lawn mower;Wheel rotation test unit, for testing the rotation angle of the wheel of lawn mower;Vibration test unit, for testing the vibration intensity of lawn mower;Cutting knife test unit, for testing the rotational speed, height and stall time of the cutting knife of lawn mower;Control unit, for controlling the work of wheel speed test unit, wheel rotation test unit, vibration test unit and cutting knife test unit;Data acquisition unit, for collecting the test results of wheel speed test unit, wheel rotation test unit, vibration test unit and cutting knife test unit;Display unit, for displaying the data of data acquisition unit. It can test the performance of lawn mower, high work efficiency, save manpower, convenient and practical.

[0007] Scheme two, a kind of battery-powered lawn mower comprehensive performance test device (CN 216718964 U) applied by Changzhou He Li Electric Appliance Co., Ltd. The device includes cabinet, industrial computer, PLC touch display screen and power module arranged in the cabinet;Analog battery box for replacing battery box of lawn mower, code scanning gun for scanning two-dimensional code of lawn mower, detection table for placing, clamping and limiting lawn mower and operating, and circuit assembly for detecting performance of lawn mower and operating detection table;Touch display screen, code scanning gun and PLC are electrically connected with industrial computer respectively;Circuit assembly is electrically connected with PLC;Analog battery box is controlled by PLC on-off to get power from power module and supply power for lawn mower. The utility model can realize automatic and accurate detection of running voltage, current, speed, blade steering and parking time of battery-powered lawn mower, automatic judgment and record detection results, solve the technical problems of wasting labor, low efficiency and low accuracy of existing detection means.

[0008] Scheme three, Suzhou Baoshide Electric Tool Co., Ltd. applied cutting assembly and grass trimmer (CN206274759U) a cutting assembly and cutting assembly of grass trimmer, can be installed in cutting machine, grass trimmer, cutting machine and other cutting machines, these cutting machines work, drive cutting assembly movement, cutting assembly in the blade cutting cutting object. The cutting assembly includes: cutter: blade: the blade is in the first position; when the rotating speed of the cutter is higher than the threshold, the centrifugal force acting on the blade makes the blade overcome the resistance of the elastic element and move to the second position: when the rotating speed of the cutter is lower than the threshold, the elastic element provides elastic force for the movement of the blade from the second position to the first position. When the cutting assembly and the grass trimmer work, the cutter rotates, the blade is subjected to the action of centrifugal force, and moves towards the direction away from the axis, expands its range, and improves the working efficiency; in the non-working state, the cutter stops rotating, the blade is subjected to the action of the elastic element, the range of the blade is contracted, and it is not easy to cause harm to people, objects and the like, which greatly improves the safety performance.

[0009] Scheme four, Suzhou Baoshide Electric Tool Co., Ltd. applied cutting mechanism and lawn mower (CN117940010A) to improve the cutting quality of the lawn mower, the invention patent puts forward various embodiments, including: ① The phase difference configuration of the cutting unit ensures that different cutting units can cut the grass at the same position in a single rotation cycle.

[0010] ② The configuration of the cutting element improves the grass leakage of the cutting device during operation, and improves the cutting efficiency and quality. ③ The size and shape design of the cutting device reduces power consumption and adapts to different heights of grass.

[0011] Compared with the traditional lawn mower, the cutting device of the patent can cut the grass multiple times by multiple cutting units without forming air flow, thereby reducing energy consumption and improving the quality of cutting grass.

[0012] The above scheme has the following disadvantages: At present, the research and development of performance detection method and device for lawn mower robot are mostly concentrated on the performance test of lawn mower whole machine or the functional design of cutting element of lawn mower itself. Although the performance test platform of lawn mower (CN 109975037 A) applied by Suzhou University and the comprehensive performance test device of battery powered lawn mower (CN 216718964U) applied by Changzhou He Li Electric Appliance Co., Ltd. have comprehensive functions and cover multiple tests, due to their high cost, complex operation and possible redundancy in some scenarios, compared with the design focusing on single cutting speed of lawn mower, they are not economical, simple and flexible. Utility model content

[0013] The utility model wants to solve the technical problem that provides a lawn mower cutting element rotating speed detection device to solve the problem that the existing technology is difficult to accurately measure the rotating speed of the cutting element caused by manually holding the lawn mower to trigger the off-ground automatic protection mechanism.

[0014] To solve the above technical problems, the utility model adopts the following technical scheme:

[0015] A lawn mower cutting element rotating speed detection device is characterized in that it comprises a test table, a lawn mower front wheel supporting mechanism, a lawn mower rear wheel supporting mechanism, a pressing and fixing mechanism and a laser testing instrument for testing the rotating speed of the cutting element of the measured lawn mower, all of which are installed on the test table.

[0016] The lawn mower front wheel supporting mechanism is provided with a hollow plate, which is suspendedly installed on the test table, and the top surface of the hollow plate is provided with front wheel supporting grooves extending in the front-rear direction, so that the front wheels of the measured lawn mower supported on the front wheel supporting grooves can move in the front-rear direction, so that the cutting element of the measured lawn mower can be aligned with the hollow holes of the hollow plate; wherein the number of front wheel supporting grooves can be set according to the number of front wheels of the measured lawn mower.

[0017] The lawn mower rear wheel supporting mechanism can support the rear wheels of the measured lawn mower.

[0018] The pressing and fixing mechanism can press and fix the measured lawn mower on the lawn mower front wheel supporting mechanism and the lawn mower rear wheel supporting mechanism.

[0019] The laser testing instrument is located below the hollow plate, and the testing end of the laser testing instrument is aligned with the cutting element of the measured lawn mower through the hollow holes of the hollow plate.

[0020] Therefore, the utility model supports the front wheels and rear wheels of the measured lawn mower through the lawn mower front wheel supporting mechanism and the lawn mower rear wheel supporting mechanism, and presses and fixes the measured lawn mower through the pressing and fixing mechanism, ensures the stability and safety of the measured lawn mower during the test process, so that the cutting element of the measured lawn mower is aligned with the hollow holes of the hollow plate, thereby the laser testing instrument can accurately and undisturbedly measure the rotating speed by aligning the cutting element of the measured lawn mower through the hollow holes without obstruction when the measured lawn mower simulates the state that the front and rear wheels are all in contact with the ground during normal work, which ensures the accuracy, efficiency and safety of the cutting element rotating speed detection, and avoids the problem that it is difficult to accurately measure the rotating speed of the cutting element caused by manually holding the lawn mower to trigger the off-ground automatic protection mechanism.

[0021] Preferably, the bottom of the test table is provided with a plurality of universal wheels to facilitate the movement of the lawn mower cutting element rotating speed detection device.

[0022] Preferably, the front wheel bearing groove is provided with a guide sliding groove perpendicular to the extension direction thereof, and the front wheel bearing groove is installed on the top surface of the hollow plate through a locking bolt, wherein the locking bolt passes through the guide sliding groove and is threadedly connected with the hollow plate.

[0023] Preferably, the hollow plate is suspendedly and fixedly installed on the test table through four vertical rods.

[0024] As a preferred embodiment of the utility model, the mower rear wheel bearing mechanism is provided with a sliding rail, a sliding block base, a rear wheel bearing lead screw, a nut and a rear wheel bearing plate, the sliding rail extends along the front-rear direction and is fixed on the top surface of the test table, the sliding block base is in sliding cooperation with the sliding rail, the rear wheel bearing lead screw is arranged along the vertical direction and is rotatably cooperated with the sliding block base, the nut is threadedly cooperated with the rear wheel bearing lead screw, the nut is threadedly cooperated with the locking bolt, and the locking bolt can abut against the rear wheel bearing lead screw to realize the height locking of the nut; the nut is fixedly connected with the rear wheel bearing plate through a support.

[0025] Therefore, by adjusting the position of the sliding block base on the sliding rail and the position of the nut on the rear wheel bearing lead screw, the front-rear position and the height position of the rear wheel bearing plate can be adjusted to adapt to different models and specifications of the measured mower, and the rear wheels of the measured mower can be accurately seated on the rear wheel bearing plate, thereby improving the adaptability of the utility model to different models and specifications of the measured mower and having the advantage of high flexibility.

[0026] Preferably, the rear wheel bearing plate is a rectangular groove.

[0027] As a preferred embodiment of the utility model, the pressing and fixing mechanism is provided with a pressing plate, both ends of the pressing plate are threadedly connected with a lead screw respectively, and the end portion of the pressing plate can be locked and fixed with the lead screw through a bolt, and the lead screw is rotatably connected with the top surface of the test table.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] First, the utility model discloses a test table 1, lawn mower front wheel bearing mechanism 2, lawn mower rear wheel bearing mechanism 3, press tightly fixed mechanism 4 and laser testing instrument 5 are equipped with, and the front wheel and rear wheel of the measured lawn mower are supported through lawn mower front wheel bearing mechanism 2 and lawn mower rear wheel bearing mechanism 3, and the measured lawn mower is pressed tightly fixed through press tightly fixed mechanism 4, ensure the stability and safety of the measured lawn mower in the testing process, so that the cutting element of the measured lawn mower is aligned with the hollow hole 2-1a of the hollow plate 2-1, whereby, can be in the measured lawn mower simulates the state that the front and rear wheels are all grounded when working normally, with laser testing instrument 5 through the hollow hole 2-1a without sheltering the cutting element of the measured lawn mower to accurately and undisturbedly carry out the speed measurement, ensure the accuracy, efficiency and safety of cutting element speed detection, avoid the problem that the cutting element speed is difficult to measure accurately because of the artificial holding up the lawn mower triggers the off-ground automatic protection mechanism.

[0030] Second, the utility model discloses that the front wheel bearing groove 2-2 is installed on the top surface of the hollow plate 2-1 through the locking bolt through the guide sliding slot 2-2a, to through loosening the locking bolt, can adjust the transverse position of guide sliding slot 2-2a or the interval between multiple guide sliding slots 2-2a, to adapt to different models of the measured lawn mower, ensure that the front wheel of the measured lawn mower can be accurately contained in the front wheel bearing groove 2-2, whereby, improve the adaptability of the utility model to different models of the measured lawn mower, with the advantage that flexibility is high.

[0031] Third, the utility model discloses that the lawn mower rear wheel bearing mechanism 3 of the utility model is equipped with slide rail 3-1, slider base 3-2, rear wheel bearing wire bar 3-3, nut 3-4 and rear wheel bearing plate 3-7, by adjusting the position of slider base 3-2 on slide rail 3-1 and the position of nut 3-4 on rear wheel bearing wire bar 3-3, the front and rear position and height position of rear wheel bearing plate 3-7 can be adjusted, to adapt to different models of the measured lawn mower, ensure that the rear wheel of the measured lawn mower can be accurately settled on rear wheel bearing plate 3-7, whereby, improve the adaptability of the utility model to different models of the measured lawn mower, with the advantage that flexibility is high.

[0032] Fourth, the utility model discloses simple structure, easy operation, easy to use, low maintenance cost, easy to routine maintenance and repair. BRIEF DESCRIPTION OF DRAWINGS

[0033] The utility model will be further explained in detail in connection with the drawings and specific embodiment:

[0034] Figure 1 It is the structure schematic drawing of the utility model's lawn mower cutting element speed detection device. CONCRETE EMBODIMENT

[0035] The utility model will be described in detail below in combination with the embodiments and the drawings thereof, so that the persons skilled in the art can better understand the utility model concept of the utility model, but the protection scope of the utility model claim is not limited to the following embodiments, and all other embodiments obtained by the persons skilled in the art without creative labor on the premise of not departing from the utility model concept of the utility model belong to the protection scope of the utility model.

[0036] In the description of the utility model, it is necessary to make it clear that the orientation language "front, rear" is only the relative concept in orientation, is for the convenience of describing the utility model or simplifying the description, and is not indicative or suggestive of the specific orientation that the utility model must have, therefore, cannot be understood as the limitation of the utility model.

[0037] Embodiment one

[0038] As Figure 1 shown, the utility model discloses a lawn mower cutting element rotating speed detection device, its characterized in being including: test table 1, and, the lawn mower front wheel supporting mechanism 2, the lawn mower rear wheel supporting mechanism 3, the pressing fixed mechanism 4 and the laser testing instrument 5 for testing the cutting element rotating speed of the measured lawn mower that are all installed on test table 1,

[0039] The lawn mower front wheel supporting mechanism 2 is equipped with the openwork plate 2-1, the openwork plate 2-1 is suspendedly installed on test table 1, the top surface of openwork plate 2-1 is installed with the front wheel supporting groove 2-2 extending along the front and rear direction, so that the front wheel of the measured lawn mower supported on the front wheel supporting groove 2-2 can move along the front and rear direction, to make the cutting element of the measured lawn mower can be aligned with the openwork hole 2-1a of openwork plate 2-1;Wherein, the number of front wheel supporting groove 2-2 can be set according to the number of front wheel of the measured lawn mower.

[0040] The lawn mower rear wheel supporting mechanism 3 can support the rear wheel of the measured lawn mower,

[0041] The pressing fixed mechanism 4 can press and fix the measured lawn mower on the lawn mower front wheel supporting mechanism 2 and the lawn mower rear wheel supporting mechanism 3,

[0042] The laser testing instrument 5 is located below the openwork plate 2-1, and the test end of laser testing instrument 5 is aligned with the cutting element of the measured lawn mower through the openwork hole 2-1a of openwork plate 2-1.

[0043] Thus, the utility model discloses a front wheel and rear wheel of the tested lawn mower are supported through the lawn mower front wheel support mechanism 2 and the lawn mower rear wheel support mechanism 3, and the tested lawn mower is pressed and fixed through the pressing and fixing mechanism 4, ensure the stability and safety of the tested lawn mower during the testing process, so that the cutting element of the tested lawn mower is aligned with the hollow hole 2-1a of the hollow plate 2-1, thereby, when the tested lawn mower simulates the state that the front and rear wheels are all grounded when working normally, the cutting element of the tested lawn mower is aligned with the hollow hole 2-1a without shielding through the laser testing instrument 5 to accurately and undisturbedly carry out the speed measurement, ensure the accuracy, efficiency and safety of the cutting element speed detection, avoid the problem that the cutting element speed is difficult to accurately measure due to the artificial holding of the lawn mower to trigger the off-ground automatic protection mechanism.

[0044] The above is the basic implementation of the embodiment one, and further optimization, improvement and limitation can be made on the basis of the basic implementation.

[0045] Preferably, the bottom of the test table 1 is provided with a plurality of universal wheels 1-1 to facilitate the movement of the lawn mower cutting element speed detection device.

[0046] Preferably, the front wheel support groove 2-2 is provided with a guide chute 2-2a perpendicular to the extension direction thereof, and the front wheel support groove 2-2 is installed on the top surface of the hollow plate 2-1 through locking bolts, wherein the locking bolts pass through the guide chute 2-2a and are threadedly connected with the hollow plate 2-1. Thus, by loosening the locking bolts, the transverse position of the guide chute 2-2a or the interval between a plurality of guide chutes 2-2a can be adjusted to adapt to different models and specifications of the tested lawn mower, and ensure that the front wheel of the tested lawn mower can be accurately accommodated in the front wheel support groove 2-2.

[0047] Preferably, the hollow plate 2-1 is suspendedly and fixedly installed on the test table 1 through four vertical rods 2-3.

[0048] Embodiment two

[0049] On the basis of the above embodiment one, the embodiment two also adopts the following preferred implementation:

[0050] The mower rear wheel bearing mechanism 3 is provided with a sliding rail 3-1, a sliding block base 3-2, a rear wheel bearing lead screw 3-3, a nut 3-4 and a rear wheel bearing plate 3-7, the sliding rail 3-1 is fixed on the top surface of the test bench 1 and extends in the front-rear direction, the sliding block base 3-2 is in sliding fit with the sliding rail 3-1, the rear wheel bearing lead screw 3-3 is arranged in the vertical direction and is in rotatable fit with the sliding block base 3-2, the nut 3-4 is in threaded fit with the rear wheel bearing lead screw 3-3, the nut 3-4 is in threaded fit with a locking bolt 3-5, and the locking bolt 3-5 can abut against the rear wheel bearing lead screw 3-3 to lock the height of the nut 3-4; and the nut 3-4 is fixedly connected with the rear wheel bearing plate 3-7 through a support 3-6. The number of the rear wheel bearing plate 3-7 can be set according to the number of the rear wheels of the mower to be tested.

[0051] Therefore, by adjusting the position of the sliding block base 3-2 on the sliding rail 3-1 and the position of the nut 3-4 on the rear wheel bearing lead screw 3-3, the front-rear position and the height position of the rear wheel bearing plate 3-7 can be adjusted to adapt to different models and specifications of the mower to be tested, so that the rear wheels of the mower to be tested can be accurately placed on the rear wheel bearing plate 3-7, thereby improving the adaptability of the mower to be tested of different models and specifications and having the advantage of high flexibility.

[0052] The above is the basic implementation manner of the second embodiment, and further optimization, improvement and limitation can be made on the basis of the basic implementation manner.

[0053] Preferably, the rear wheel bearing plate 3-7 is a rectangular groove.

[0054] Embodiment three

[0055] On the basis of the above-mentioned embodiment one or embodiment two, the third embodiment further adopts the following preferred implementation manner:

[0056] The pressing and fixing mechanism 4 is provided with a pressing plate 4-1, both ends of the pressing plate 4-1 are in threaded fit with a lead screw 4-2, and the end portion of the pressing plate 4-1 can be locked and fixed with the lead screw 4-2 through a bolt 4-3, and the lead screw 4-2 is rotatably connected with the top surface of the test bench 1. Therefore, the mower to be tested can be pressed and fixed on the mower front wheel bearing mechanism 2 and the mower rear wheel bearing mechanism 3 through the pressing plate 4-1.

[0057] The utility model is not limited to the above-mentioned specific implementation, according to the above-mentioned content, according to the ordinary technical knowledge and the usual means of the art, under the premise that not departing from the above-mentioned basic technical thought of the utility model, the utility model can make other various forms of equivalent modification, replacement or change, all fall in the protection scope of the utility model.

Claims

1. A mower cutting element rotational speed detection device, characterised in that, The utility model relates to a cutting grass machine test bench, and belongs to the cutting grass machine test equipment field. The utility model provides a cutting grass machine test bench, which comprises a test bench (1), a cutting grass machine front wheel bearing mechanism (2), a cutting grass machine rear wheel bearing mechanism (3), a pressing fixing mechanism (4) and a laser testing instrument (5) for testing the rotating speed of the cutting element of the cutting grass machine to be tested, which are all installed on the test bench (1). The cutting grass machine front wheel bearing mechanism (2) is provided with a hollow plate (2-1) which is suspendedly installed on the test bench (1), and the top surface of the hollow plate (2-1) is provided with a front wheel bearing groove (2-2) extending in the front-rear direction, so that the front wheel of the cutting grass machine to be tested supported on the front wheel bearing groove (2-2) can move in the front-rear direction, and the cutting element of the cutting grass machine to be tested can be aligned with the hollow hole (2-1a) of the hollow plate (2-1). The cutting grass machine rear wheel bearing mechanism (3) can bear the rear wheel of the cutting grass machine to be tested. The pressing fixing mechanism (4) can press and fix the cutting grass machine to be tested on the cutting grass machine front wheel bearing mechanism (2) and the cutting grass machine rear wheel bearing mechanism (3). The laser testing instrument (5) is located below the hollow plate (2-1), and the testing end of the laser testing instrument (5) is aligned with the cutting element of the cutting grass machine to be tested through the hollow hole (2-1a) of the hollow plate (2-1).

2. The device according to claim 1, wherein: The bottom of the test bench (1) is provided with a plurality of universal wheels (1-1).

3. The device according to claim 1 or 2, wherein: The front wheel bearing groove (2-2) is provided with a guide sliding groove (2-2a) perpendicular to the extension direction thereof, and the front wheel bearing groove (2-2) is installed on the top surface of the hollow plate (2-1) through a locking bolt which passes through the guide sliding groove (2-2a) and is threadedly connected with the hollow plate (2-1).

4. The device according to claim 1 or 2, wherein: The hollow plate (2-1) is suspendedly and fixedly installed on the test bench (1) through four vertical rods (2-3).

5. The device according to claim 1 or 2, wherein: The cutting grass machine rear wheel bearing mechanism (3) is provided with a sliding rail (3-1), a sliding block base (3-2), a rear wheel bearing lead screw (3-3), a nut (3-4) and a rear wheel bearing plate (3-7), the sliding rail (3-1) extends in the front-rear direction and is fixed on the top surface of the test bench (1), the sliding block base (3-2) is in sliding cooperation with the sliding rail (3-1), the rear wheel bearing lead screw (3-3) is arranged in the vertical direction and is in rotatable cooperation with the sliding block base (3-2), the nut (3-4) is in threaded cooperation with the rear wheel bearing lead screw (3-3), the nut (3-4) is in threaded cooperation with a locking bolt (3-5), and the locking bolt (3-5) can abut against the rear wheel bearing lead screw (3-3); the nut (3-4) is fixedly connected with the rear wheel bearing plate (3-7) through a support (3-6).

6. The device according to claim 5, wherein the device is configured to determine the rotational speed of the cutting element by determining the time period between the first and second signals. The rear wheel bearing plate (3-7) is a rectangular groove.

7. The device according to claim 1 or 2, wherein the device is characterized by comprising: a sensor for detecting the rotation speed of the cutting element; and a controller for controlling the rotation speed of the cutting element based on the detected rotation speed of the cutting element. The pressing fixing mechanism (4) is provided with a pressing plate (4-1), both ends of the pressing plate (4-1) are threadedly connected with a lead screw (4-2), and the end portion of the pressing plate (4-1) can be locked and fixed with the lead screw (4-2) through a bolt (4-3), and the lead screw (4-2) is rotatably connected with the top surface of the test bench (1).

Images