Excavator pushing and pressing belt tensioning system and excavator pushing and pressing belt automatic tensioning control method

Abstract

The invention discloses an excavator pushing and pressing belt tensioning system and an excavator pushing and pressing belt automatic tensioning control method.The system comprises a motor hinge assembly, a hinge piece, a tensioning cylinder hinge lug base and an electric tensioning cylinder, and a pushing and pressing motor base fixedly provided with a pushing and pressing motor is hinged to a cargo boom through the motor hinge assembly; the electric tensioning cylinder is arranged between the pushing motor and the pushing speed reducer, a piston rod of the electric tensioning cylinder is hinged to a hinge piece on the pushing motor base, a cylinder body of the electric tensioning cylinder is hinged to the cargo boom, and when the tensioning motor rotates to drive the piston rod to stretch out, the pushing motor and the driving belt pulley are driven to rotate; and the distance between the driving belt pulley and the driven belt pulley is gradually increased, so that the pushing and pressing belt is tensioned. According to the invention, the electric tensioning cylinder is used as a power execution element for tensioning the pushing belt, so that the structure of the pushing belt tensioning system of the excavator is greatly simplified, the system failure rate is reduced, the maintenance workload is small, and the manufacturing and using cost of the excavator is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of mining excavators, and particularly relates to an excavator push belt tensioning system and an automatic tensioning control method for the excavator push belt. Background Technology

[0002] The push belt drive is one of the key power mechanisms in a mining excavator for completing material digging operations. Typically, a push belt drive consists of a push motor, pulleys, a push belt, a push reducer, and a brake. The primary function of the push belt is to transmit the torque of the push motor to the push reducer. Secondly, the push belt can absorb a significant amount of impact load during material digging, thus protecting the push motor. To ensure the proper functioning of the mining excavator's push mechanism, the push belt must be correctly tensioned.

[0003] The tensioning of the push belts in mining excavators has traditionally relied on hydraulic cylinders. Due to ingrained thinking, research on the tensioning function of push belts has remained focused on hydraulic control. Currently, most push belt tensioning methods involve manual hydraulic pump tensioning followed by mechanical locking. This method requires periodic manual adjustments, resulting in low maintenance efficiency and a large workload.

[0004] To address the problems existing in the prior art, Chinese patent CN112664501A discloses an automatic tensioning hydraulic control system for excavator push belts. This system uses a self-locking hydraulic cylinder to achieve tension control of the push belt. The hydraulic control system automatically tensions the belt at preset time intervals. However, the entire system includes multiple control components such as an oil pump, oil tank, directional valve, throttle valve, shuttle valve, sequence valve, and self-locking hydraulic cylinder. The system is complex, has many control links, and still suffers from high usage and maintenance costs, large maintenance workload, and low maintenance efficiency. Summary of the Invention

[0005] To address some or all of the technical problems existing in the prior art, the present invention provides an excavator push belt tensioning system and an automatic tensioning control method for excavator push belts.

[0006] In one aspect of the present invention, the provided excavator push-belt tensioning system is applied in an excavator push-belt drive device, the excavator push-belt drive device comprising a push-belt motor, a push-belt reducer, a drive pulley, a driven pulley, and a push-belt mounted on the excavator boom, wherein the motor output shaft of the push-belt motor is fixedly connected to the drive pulley, the reducer input shaft of the push-belt reducer is fixedly connected to the driven pulley, and the push-belt is connected to the drive pulley and the driven pulley, characterized in that the excavator push-belt tensioning system comprises: a motor hinge assembly, a hinge member, a tensioning cylinder hinge lug, and an electric tensioning cylinder, wherein:

[0007] The motor hinge assembly includes a first hinge lug and a second hinge lug. The upper end of the first hinge lug is fixed to the lower part of the push motor base of the push motor, and the bottom of the second hinge lug is fixed to the excavator boom. The lower end of the first hinge lug and the top of the second hinge lug are hinged to each other.

[0008] The hinge is fixedly connected to the side of the push motor base near the push reducer, and the bottom of the tension cylinder hinge lug is fixed to the excavator boom.

[0009] The electric tensioning cylinder includes a piston rod, a cylinder body, a tensioning motor, a piston rod connecting lug, and a cylinder body connecting lug. The piston rod is hinged to the hinge member through the piston rod connecting lug, and the cylinder body is hinged to the tensioning cylinder hinge lug seat through the cylinder body connecting lug. The tensioning motor is fixed on the cylinder body.

[0010] Furthermore, in the above-mentioned excavator push belt tensioning system, the electric tensioning cylinder is equipped with a tensioning motor controller, and the tensioning motor controller, the tensioning motor, and the excavator's overall controller are interconnected.

[0011] Furthermore, in the above-mentioned excavator push belt tensioning system, an alarm module is also provided. The alarm module is integrated into the excavator's overall controller. At the same time, the excavator's overall controller stores a preset threshold value for the output torque of the tensioning motor. The preset threshold value for the output torque of the tensioning motor corresponds to the output torque value of the tensioning motor when the push belt is tensioned to the target tension.

[0012] Furthermore, in the above-mentioned excavator push belt tensioning system, the control panel of the tensioning motor controller is equipped with "manual", "automatic" and "off" working positions. The automatic working position corresponds to the automatic tensioning working mode and is used for automatic tensioning control of the push belt; the off working position corresponds to the electric tensioning cylinder being in a power-off self-locking state; and the manual working position corresponds to the manual tensioning working mode.

[0013] In one aspect of the present invention, the provided excavator push belt automatic tensioning control method utilizes the aforementioned excavator push belt tensioning system, wherein the knob on the tensioning motor controller control panel is rotated to the "automatic" position, and the excavator's overall controller controls the tensioning motor to automatically tension the push belt according to a stored automatic tensioning setting cycle. The specific steps of the excavator push belt automatic tensioning control method include:

[0014] (1) After the excavator is powered on, the machine controller determines whether all the excavator brakes are in the closed state. If so, it proceeds to the next step; otherwise, it sends a signal to close all the excavator brakes.

[0015] (2) After confirming that the knob on the control panel of the tension motor controller is rotated to the "automatic" position, power is supplied to the tension motor through the control of the whole machine controller;

[0016] (3) When it is determined that the automatic tensioning set cycle has been reached, the whole machine controller controls the tensioning motor to rotate counterclockwise, and the piston rod of the electric tensioning cylinder retracts to ensure that the belt is in a slack state.

[0017] (4) The whole machine controller controls the tensioning motor to rotate clockwise, the piston rod of the electric tensioning cylinder extends, and the belt is gradually tensioned;

[0018] (5) When the output torque of the tensioning motor reaches the preset threshold of the output torque of the tensioning motor, the electric tensioning cylinder will emit a warning sound, the whole machine controller will control the tensioning motor to cut off the power, the piston rod will remain in the current position, and the belt will be pushed to tension in place.

[0019] The excavator push belt tensioning system and the automatic tensioning control method for the excavator push belt of the present invention have the following advantages and beneficial effects:

[0020] This invention uses an electric tensioning cylinder as the power actuator for tensioning the push belt, which greatly simplifies the structure of the excavator's push belt tensioning system, reduces the system failure rate, minimizes maintenance workload, and lowers the manufacturing and operating costs of the excavator. Furthermore, the tensioning and untensioning of the push belt can be achieved by controlling the forward and reverse rotation of the tensioning motor, further reducing usage and maintenance costs. Moreover, after the tensioning motor is de-energized, the electric tensioning cylinder can achieve mechanical self-locking, avoiding additional locking mechanisms, reducing intermediate steps, simplifying the structure, and improving operational reliability. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and constitute a part of this invention, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the overall layout of an excavator push belt tensioning system according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of an electric tensioning cylinder in an excavator push belt tensioning system according to an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the control panel of the tensioning motor controller in an excavator push belt tensioning system according to an embodiment of the present invention;

[0025] Figure 4 This is a flowchart illustrating a manual tensioning control method for a push belt implemented using the excavator push belt tensioning system of the present invention, according to an embodiment of the present invention.

[0026] Figure 5 This is a flowchart illustrating an embodiment of the automatic tensioning control method for a push belt implemented using the excavator push belt tensioning system of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 10. Push motor; 11. Motor output shaft; 12. Push motor mount; 20. Push reducer; 21. Reducer input shaft; 30. Drive pulley; 40. Driven pulley; 50. Push belt; 60. Motor hinge assembly; 61. First hinge lug; 62. Second hinge lug; 70. Hinge; 80. Tensioner hinge lug; 90. Electric tensioner; 91. Piston rod; 92. Cylinder body; 93. Tensioner motor; 94. Piston rod connecting lug; 95. Cylinder body connecting lug; 96. Tensioner motor controller; 100. Excavator boom. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0030] This invention provides a tensioning system for an excavator push-belt drive, applied in the excavator push-belt drive device, as shown in the attached figure. Figure 1-3As shown, the excavator push belt drive device includes a push motor 10, a push reducer 20, a drive pulley 30, a driven pulley 40, and a push belt 50, all mounted on the excavator boom 100. The motor output shaft 11 of the push motor 10 is fixedly connected to the drive pulley 30, and the reducer input shaft 21 of the push reducer 20 is fixedly connected to the driven pulley 40. The push belt 50 is connected to the drive pulley 30 and the driven pulley 40. The motor output shaft 11 drives the drive pulley 30 to rotate, and the push belt 50 transmits the torque of the drive pulley 30 to the driven pulley 40, which in turn drives the reducer input shaft 21 to rotate.

[0031] The excavator push-belt tensioning system of the present invention includes a motor hinge assembly 60, a hinge member 70, a tension cylinder hinge lug 80, and an electric tension cylinder 90. The motor hinge assembly 60 includes a first hinge lug 61 and a second hinge lug 62. The upper end of the first hinge lug 61 is fixed to the lower part of the push-motor base 12 of the push-motor 10, and the bottom of the second hinge lug 62 is fixed to the excavator boom 100. The lower end of the first hinge lug 61 and the top of the second hinge lug 62 are hinged together. One end of the hinge member 70 is fixedly connected to the side of the push-motor base 12 near the push-reducer 20. The tension cylinder hinge lug 80... The bottom is fixed to the excavator boom 100; the electric tension cylinder 90 includes a piston rod 91, a cylinder body 92, a tension motor 93, a piston rod connecting lug 94, and a cylinder body connecting lug 95. The piston rod 91 is hinged to the hinge 70 set on the push motor seat 12 through the piston rod connecting lug 94. The cylinder body 92 is hinged to the tension cylinder hinge lug seat 80 fixed on the excavator boom 100 through the cylinder body connecting lug 95. The tension motor 93 is fixed on the cylinder body 92. In addition, the electric tension cylinder 90 is also equipped with a tension motor controller 96. The tension motor controller 96, the tension motor 93, and the excavator's overall controller are interconnected.

[0032] In the excavator push belt tensioning system of the present invention, the function of the electric tensioning cylinder 90 is to maintain the tension of the push belt 50 so as to correctly transmit torque and ensure the normal operation of the excavator push mechanism. The specific working principle is as follows: when the tensioning motor 93 rotates clockwise, the piston rod 91 gradually extends, driving the push motor 10 and the drive pulley 30 to rotate counterclockwise around the hinge point between the piston rod connecting lug 94 and the hinge 70, so that the distance between the drive pulley 30 and the driven pulley 40 gradually increases, thereby gradually tensioning the push belt 50 until the target tension is reached. Then the tensioning motor 93 is de-energized and stops rotating, and the piston rod 91 can remain stationary under the self-locking action of the internal mechanical structure of the electric tensioning cylinder 90, thereby keeping the distance between the drive pulley 30 and the driven pulley 40 unchanged, maintaining the tension of the push belt 50, and ensuring the normal operation of the mining excavator push mechanism.

[0033] In addition, if it is necessary to replace or repair the push belt 50, the tension motor 93 can be controlled to rotate counterclockwise, the piston rod 91 gradually retracts, and the push motor 10 and the drive pulley 30 rotate clockwise around the hinge point between the piston rod connecting lug 94 and the hinge 70, so that the distance between the drive pulley 30 and the driven pulley 40 gradually decreases, thereby gradually loosening the push belt 50, which makes it convenient to replace or repair the push belt.

[0034] To prevent the push belt 50 from being over-tensioned and damaged during the tensioning process of the electric tensioning cylinder 90, and to improve the tensioning efficiency of the push belt 50, an alarm module (not shown) is also provided in the excavator push belt tensioning system of the present invention. This alarm module is integrated into the excavator's overall controller. The excavator's overall controller stores a preset threshold value for the output torque of the tensioning motor. This preset threshold value corresponds to the output torque value of the tensioning motor when the push belt 50 is tensioned to the target tension. Therefore, during the tensioning process of the push belt 50 by the electric tensioning cylinder 90 provided by the present invention, when the push belt 50 is tensioned to the target tension, that is, when the output torque value of the tensioning motor reaches the preset threshold value, the alarm module is triggered, and the electric tensioning cylinder 90 emits an alarm sound. At this time, the tensioning motor 93 can be de-energized and stopped, completing the tensioning of the push belt 50.

[0035] In summary, the excavator push belt tensioning system provided by the present invention has a push motor base 12, on which a push motor 10 is fixedly installed, hinged to the excavator boom 100 via a motor hinge assembly 60. An electric tensioning cylinder 90 is provided between the push motor 10 and the push reducer 20. The piston rod 91 of the electric tensioning cylinder 90 is hinged to the hinge member 70 on the push motor base 12, and the cylinder body 92 of the electric tensioning cylinder 90 is hinged to the excavator boom 100 via a tensioning cylinder hinge lug 80. When the tensioning motor 93 rotates and drives the piston rod 91 to extend, it drives the push motor 10 and the drive pulley 30 to rotate, so that the distance between the drive pulley 30 and the driven pulley 40 gradually increases, thereby tensioning the push belt 50 until the target tension that can ensure the normal operation of the mining excavator push mechanism is reached.

[0036] Therefore, the excavator push belt tensioning system of the present invention uses an electric tensioning cylinder 90 as the power actuator for tensioning the push belt 50, which greatly simplifies the structure of the excavator push belt tensioning system, reduces the system failure rate, reduces maintenance workload, and reduces the manufacturing and use costs of the excavator. At the same time, the tensioning and loosening of the push belt 50 can be achieved by controlling the forward and reverse rotation of the tensioning motor 93, which reduces the use and maintenance costs. Moreover, after the tensioning motor 93 is de-energized, the electric tensioning cylinder 90 can achieve mechanical self-locking, avoiding additional locking mechanisms, reducing intermediate links, simplifying the structure, and improving the reliability of operation.

[0037] It is also understood that the excavator push belt tensioning system provided in this embodiment is merely an illustrative description of the technical solution of the present invention. Any scheme that uses an electric tensioning cylinder to push the motor mount to adjust the distance between the motor-side pulley and the reducer-side pulley, thereby adjusting the tension of the transmission belt, falls within the protection scope of the present invention. Furthermore, this embodiment only uses one push belt for illustrative purposes and does not limit the number of push belts. Whether the number of "belts" is single or multiple, and whether the type of push motor is an AC motor, DC motor, permanent magnet motor, or other types, it also falls within the protection scope of the present invention.

[0038] In the excavator push-belt tensioning system of the present invention, the control panel of the tensioning motor controller 96 is provided with "manual", "automatic" and "off" working positions. One of the above three working positions can be selected by turning a knob. The automatic working position corresponds to the automatic tensioning working mode, which is used to automatically tension the push-belt using the excavator push-belt tensioning system of the present invention. The off working position corresponds to the excavator push-belt tensioning system of the present invention being in the off state, and the electric tensioning cylinder being in the power-off self-locking state, which is generally suitable for maintenance of the push-belt transmission device. The manual working position corresponds to the manual tensioning working mode, which is generally suitable for replacing the push-belt. When the manual working position is selected, the "up" and "down" buttons on the control panel of the tensioning motor controller 96 can be activated. "Up" corresponds to the piston rod 91 of the electric tensioning cylinder 90 extending, and the distance between the driving pulley 30 and the driven pulley 40 gradually increasing, thereby tensioning the push-belt 50. "Down" corresponds to the piston rod 91 of the electric tensioning cylinder 90 retracting, and the distance between the driving pulley 30 and the driven pulley 40 gradually decreasing, thereby relaxing the push-belt 50.

[0039] For example, refer to Figure 4 The manual tensioning control method for the push belt implemented using the above-mentioned excavator push belt tensioning system provided in this embodiment of the invention includes:

[0040] (1) Ensure that all brakes on the excavator are in the closed position;

[0041] (2) Rotate the knob on the control panel of the tension motor controller 96 to the "manual" position;

[0042] (3) Press and hold the “Lower” button, the tension motor 93 rotates counterclockwise, the piston rod 91 retracts, and drives the push motor 10 and the drive pulley 30 to rotate clockwise around the hinge point between the piston rod connecting ear 94 and the hinge 70, so that the distance between the drive pulley 30 and the driven pulley 40 gradually decreases until the push belt 50 is in a relaxed state, and then release the “Lower” button;

[0043] (4) Press and hold the “Up” button, the tensioning motor 93 rotates clockwise, the piston rod 91 extends, driving the push motor 10 and the drive pulley 30 to rotate counterclockwise around the hinge point between the piston rod connecting ear 94 and the hinge 70, so that the distance between the drive pulley 30 and the driven pulley 40 gradually increases, and the push belt 50 is gradually tensioned until the push belt 50 is tensioned to the target tension. The output torque value of the tensioning motor 93 reaches the preset threshold of the tensioning motor output torque stored in the excavator controller. After the electric tensioning cylinder 90 emits a “beep beep beep” prompt sound for 3 seconds, release the “Up” button and the push belt 50 is tensioned in place.

[0044] When implementing automatic tension control of the push belt using the excavator push belt tensioning system described above, first rotate the knob on the control panel of the tensioning motor controller 96 to the "automatic" position. Then, the excavator's overall controller will control the tensioning motor 93 to automatically tension the push belt 50 according to the stored automatic tensioning setting cycle. For example, refer to... Figure 5 The specific steps of the automatic tensioning control method for the excavator push belt provided in this embodiment of the invention include:

[0045] (1) Five seconds after the excavator is powered on, the machine controller determines whether all the excavator's brakes are in the closed state. If so, proceed to the next step; otherwise, send a signal to close all the excavator's brakes.

[0046] (2) After confirming that the knob on the control panel of the tension motor controller is rotated to the "automatic" position, power is supplied to the tension motor through the control of the whole machine controller;

[0047] (3) When it is determined that the automatic tensioning set cycle has been reached, the whole machine controller controls the tensioning motor to rotate counterclockwise for 10 seconds, and the piston rod of the electric tensioning cylinder retracts to ensure that the belt is in a slack state.

[0048] (4) The whole machine controller controls the tensioning motor to rotate clockwise, the piston rod of the electric tensioning cylinder extends, and the belt is gradually tensioned;

[0049] (5) When the output torque of the tensioning motor reaches the preset threshold of the output torque of the tensioning motor, the electric tensioning cylinder emits a "beep beep beep" prompt sound. After 3 seconds, the tensioning motor is de-energized, the piston rod remains in the current position, and the belt is pushed to tension.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, the terms "front," "back," "left," "right," "upper," and "lower" in this document refer to the placement shown in the accompanying drawings.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A push-belt tensioning system for an excavator, applied in a push-belt drive device of an excavator, the push-belt drive device comprising a push-belt motor, a push-belt reducer, a drive pulley, a driven pulley, and a push-belt mounted on the excavator boom, wherein the output shaft of the push-belt motor is fixedly connected to the drive pulley, the input shaft of the push-belt reducer is fixedly connected to the driven pulley, and the push-belt is connected to the drive pulley and the driven pulley, characterized in that... The excavator push-belt tensioning system includes: a motor hinge assembly, a hinge component, a tension cylinder hinge lug, and an electric tension cylinder, wherein: The motor hinge assembly includes a first hinge lug and a second hinge lug. The upper end of the first hinge lug is fixed to the lower part of the push motor base of the push motor, and the bottom of the second hinge lug is fixed to the excavator boom. The lower end of the first hinge lug and the top of the second hinge lug are hinged to each other. The hinge is fixedly connected to the side of the push motor base near the push reducer, and the bottom of the tension cylinder hinge lug is fixed to the excavator boom. The electric tensioning cylinder includes a piston rod, a cylinder body, a tensioning motor, a piston rod connecting lug, and a cylinder body connecting lug. The piston rod is hinged to the hinge member through the piston rod connecting lug, and the cylinder body is hinged to the tensioning cylinder hinge lug seat through the cylinder body connecting lug. The tensioning motor is fixed on the cylinder body.

2. The excavator push belt tensioning system according to claim 1, characterized in that, The electric tensioning cylinder is equipped with a tensioning motor controller, and the tensioning motor controller, the tensioning motor, and the excavator's overall controller are interconnected.

3. The excavator push belt tensioning system according to claim 2, characterized in that, The excavator push belt tensioning system is also equipped with an alarm module, which is integrated into the excavator's overall controller. The excavator's overall controller also stores a preset threshold value for the output torque of the tensioning motor, which corresponds to the output torque value of the tensioning motor when the push belt is tensioned to the target tension.

4. The excavator push belt tensioning system according to claim 3, characterized in that, The control panel of the tensioning motor controller is equipped with "manual", "automatic" and "off" working positions. The automatic working position corresponds to the automatic tensioning working mode and is used for automatic tensioning control of the push belt; the off working position corresponds to the electric tensioning cylinder being in the power-off self-locking state; and the manual working position corresponds to the manual tensioning working mode.

5. A method for automatically tensioning a push belt on an excavator, wherein the method utilizes the excavator push belt tensioning system as described in claim 4, wherein a knob on the control panel of the tensioning motor controller is rotated to the "automatic" position, and the excavator's overall controller controls the tensioning motor to automatically tension the push belt according to a stored automatic tensioning setting cycle, characterized in that... The specific steps of the excavator push belt automatic tension control method include: (1) After the excavator is powered on, the machine controller determines whether all the excavator brakes are in the closed state. If so, it proceeds to the next step; otherwise, it sends a signal to close all the excavator brakes. (2) After confirming that the knob on the control panel of the tension motor controller is rotated to the "automatic" position, power is supplied to the tension motor through the control of the whole machine controller; (3) When it is determined that the automatic tensioning set cycle has been reached, the whole machine controller controls the tensioning motor to rotate counterclockwise, and the piston rod of the electric tensioning cylinder retracts to ensure that the belt is in a slack state. (4) The whole machine controller controls the tensioning motor to rotate clockwise, the piston rod of the electric tensioning cylinder extends, and the belt is gradually tensioned; (5) When the output torque of the tensioning motor reaches the preset threshold of the output torque of the tensioning motor, the electric tensioning cylinder will emit a warning sound, the whole machine controller will control the tensioning motor to cut off the power, the piston rod will remain in the current position, and the belt will be pushed to tension in place.

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