Tensioning and supporting system of transmission mechanism

Abstract

The utility model relates to a transmission tensioning mechanism, in particular to a tensioning supporting system of a transmission mechanism, which is matched with power or cutting equipment to be arranged on an equipment body shell and comprises a supporting U-shaped block, a spring, a movable back plate, a guide shaft and a guide shaft fixing T-shaped block. The supporting U-shaped block and the guiding shaft fixing T-shaped block are fixed to the machine body shell. The guide shaft is mounted between the supporting U-shaped block and the guide shaft fixing T-shaped block; the movable back plate is mounted on the guide shaft in a sliding manner; a guide column is fixed in a corresponding positioning hole in the right side of the supporting U-shaped block and sleeved with a spring, and the two ends of the spring are connected with the supporting U-shaped block and the movable back plate respectively; and the movable back plate fixing shaft core is used for fixing a driving motor, a transmission wheel or a cutting tool. According to the tensioning supporting system, the driving motor, the transmission wheel or the cutting tool is carried through the movable back plate, the tensioning supporting system is used for conducting tensioning adjustment on a transmission belt or a transmission chain or the cutting tool, self-adaptive matching of tension of an equipment transmission mechanism is achieved, and applicability is high.

Description

Technical Field

[0001] This utility model relates to a transmission tensioning mechanism, specifically a tensioning support system for a transmission mechanism, which is suitable for tensioning support of linear cutting tools or rotary cutting tools. Background Technology

[0002] Existing power cutting tools include commonly used angle grinders, band saws, circular saws, and chainsaws. With the increasing maturity of diamond wire cutting technology, the application of wire saws has also become more widespread. These tools, except for those with direct drive to rotate the cutting tool, generally have belt drive mechanisms. For example, band saws, circular saws, chainsaws, and circular wire saws all require tensioning and support mechanisms to achieve effective power transmission, as do belt-driven electrical circuitry.

[0003] The applicant has developed an electric cutting machine system (handheld power tool), comprising a rotatable, protective-covered handle with a start / stop switch, a directional switch, and interlocking dual-sided handle for mounting a ring saw reel, a drive unit for driving the reel, the drive unit itself including a power output system (i.e., a drive motor), a spindle for mounting the reel, a flange, and a transmission device for connecting the motor and the spindle. To ensure the ring saw's operating efficiency, and due to the high load of cutting, an effective tensioning support system is needed to keep the ring saw tensioned.

[0004] Existing tensioning methods often use a single bolt to pull one end of the tool, such as a hacksaw. Carpenters' hand saws, on the other hand, use ropes to tighten the handles at both ends of the I-beam saw frame to tension the saw blade. However, these methods are clearly unsuitable for high-load cutting tools and high-power mechanical transmissions, and their effectiveness and efficiency are insufficient.

[0005] Currently, all wire saw cutting systems use either servo tensioning or gravity tensioning. The former requires an additional motor drive and has a complex structure; the latter provides constant force tensioning, which is not suitable for complex cutting environments. Some systems use spring tensioning, but these are all spring tensioning systems (tension springs), which occupy a lot of space and have a complex structure, making them unsuitable for small-sized installations like handheld devices.

[0006] Chinese patent CN217401618U discloses an automatic tensioning device for a transmission mechanism, solving the technical problems of existing pressure rollers lacking specific installation structures, failing to assist in tensioning the transmission belt during initial stretching, and slipping due to belt elongation after use. The tensioning device includes a pressure roller mounted on the inner side of the lower part of the transmission belt via a support assembly. The support assembly includes a frame connected to a machine frame, a wheel seat vertically slidably mounted on the frame, and springs at the upper and lower ends respectively abutting against the top of the frame and the upper surface of the wheel seat. The pressure roller is rotatably mounted on the wheel seat. This invention can provide a pre-tension force to the transmission belt through the pre-compression of the springs, ensuring stable contact between the pressure roller and the transmission belt, avoiding improper installation due to manufacturing or installation errors. Simultaneously, the springs ensure constant contact between the pressure roller and the transmission belt, preventing vibration and maintaining smooth operation. However, this automatic tensioning device for transmission mechanisms is intended for conveyor belts and is still insufficient for high-load cutting tools and high-power mechanical transmissions. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies by proposing a tensioning support system for a transmission mechanism. It is suitable for high-load cutting tools and high-power mechanical transmissions, and can adapt to different tools by adjusting the corresponding tension force, with adaptive matching.

[0008] The technical solution adopted in this utility model is as follows:

[0009] Design a tensioning support system for a transmission mechanism, which is installed on the housing of the equipment in conjunction with a power device or cutting tool. The system includes a supporting U-shaped block, a spring, a movable back plate, a guide shaft, and a T-shaped block for fixing the guide shaft.

[0010] The supporting U-shaped block and the guide shaft fixing T-shaped block are mechanically fixed to the fuselage shell;

[0011] The guide shaft is installed between the supporting U-shaped block and the guide shaft fixing T-shaped block; the movable back plate is slidably installed on the guide shaft;

[0012] A guide post is fixed in the corresponding positioning hole on the right side of the support U-shaped block, and a spring is sleeved on the guide post. The two ends of the spring are respectively connected to the support U-shaped block and the movable back plate. The movable back plate is used to fix the drive motor, transmission wheel or cutting tool.

[0013] This utility model tension support system uses the movable back plate to mount a drive motor (with a drive wheel), transmission wheel, or cutting tool. It is used for power equipment or cutting tools that require tension adjustment of the transmission belt, transmission chain, or the cutting tool itself, to achieve adaptive tension matching of the transmission mechanism and to adjust the corresponding tension force according to different tools.

[0014] Preferably, the tensioning support system has two guide shafts, which are respectively installed in the corresponding holes at the upper and lower ends of the support U-shaped block and between the guide shaft fixing T-shaped blocks. A linear bearing or slider is installed on the guide shaft. The upper and lower ends of the movable back plate are provided with transverse through holes, which are interference-fitted with the linear bearing or slider to achieve stable left and right movement of the movable back plate.

[0015] Preferably, in the tensioning support system, the number of springs and guide posts depends on the object being processed and the tension required by the transmission equipment or processing tool, and is generally 2 to 6. The length of the corresponding guide post is 20% to 60% of the left and right stroke of the movable back plate to ensure the stability of the spring (compression spring) during extension and retraction.

[0016] Preferably, in the tensioning support system of the transmission mechanism, the guide post is fixed from right to left in the corresponding positioning hole on the right side of the middle part of the support U-shaped block by screws, and the spring (compression spring) passes through the guide post. The support U-shaped block and the movable back plate have corresponding holes to accommodate part of the spring (compression spring). The diameter of the hole is about 105% to 120% of the spring (compression spring), and the depth of the hole is about 5 to 15 mm, depending on the stiffness of the spring and the total length. The stiffness of the spring can be selected in the range of 2 N / m to 10 N / m to meet the tension force required for the transmission of different tools or equipment.

[0017] Preferably, the tensioning support system of the transmission mechanism has an electric push rod on the right side of the machine body housing, which cooperates with the movable back plate to facilitate the installation and replacement of the conveyor belt, transmission chain, ring saw or saw blade. The electric push rod is fixed inside the machine body housing, and the telescopic end of the electric push rod is connected to the movable back plate of the tensioning support system. The electric push rod is connected to the power supply through a control switch.

[0018] Preferably, the tensioning support system of the transmission mechanism uses a three-position self-resetting switch for control. When the three-position self-resetting switch of the electric push rod is closed, the electric push rod can move left and right. The electric push rod pushes the movable back plate in the tensioning support system to move to the left against the spring tension, which facilitates the replacement of the conveyor belt, transmission chain, wire saw or saw blade. The self-resetting switch ensures that the electric push rod will not be continuously powered on, protecting the DC motor.

[0019] The beneficial effects of this utility model are:

[0020] 1. The tensioning support system of the transmission mechanism of this utility model adopts a multi-compression spring combination tensioning to achieve a more compact tensioning mechanism, which can make more effective use of limited space, and is adaptively adjustable in tension. That is, the tension force changes with the actual tension through the spring. When the tension increases, the tensioning support system provides higher tension; when the tension disappears, the tensioning support system reduces the tension.

[0021] 2. The tensioning support system of the transmission mechanism of this utility model adopts a parallel compression spring tensioning support mechanism with multiple modes. The tension force can be adjusted by adjusting the number of springs and the spring elastic coefficient according to the actual situation. It is suitable for various transmission systems for tensioning ring cutting wires or pulleys and sprockets for mechanical processing and transmission.

[0022] 3. The tensioning support system of this utility model's transmission mechanism has a compact and simple structural design, with an overall weight of less than 400g. It can achieve tension of 1-40N / mm and can provide a maximum tension of 400N. It can achieve tensioning without external power in confined spaces, that is, without the aid of gravity or additional motors.

[0023] 4. The tensioning support system of the transmission mechanism of this utility model has a built-in miniature push rod motor, which can quickly relax the corresponding support system (compress the spring) in a closed and confined space, and can also quickly tension the corresponding support system (release the spring). The tension force changes with the actual tension through the spring. The fully open state is the processing state, and when fully compressed with the push rod motor, it is used to relax the cutting wire. The non-processing state is used for wire replacement. Attached Figure Description

[0024] Figure 1 The image shown is one of the structural schematic diagrams of the tensioning support system of this utility model used in a ring saw cutting machine;

[0025] Figure 2 The second schematic diagram shows the structure of the tensioning support system of this utility model used in a ring saw cutting machine. Detailed Implementation

[0026] To make the technical concept and advantages of the invention clearer, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the following embodiments are only used to explain and illustrate preferred embodiments of this utility model and should not be construed as limiting the scope of patent protection claimed for this utility model.

[0027] This utility model is illustrated using only a circular saw cutting machine as an example, and the accompanying drawings are also based on the circular saw cutting machine.

[0028] Example 1

[0029] See Figure 1 , Figure 2 The tensioning support system of the transmission mechanism of this utility model is installed in conjunction with the power equipment or cutting tool on the housing of the equipment body. The tensioning support system 6 includes a supporting U-shaped block 6a, a spring (compression spring) 6c, a movable back plate 6d, a guide shaft (slide rail) 6f, and a guide shaft fixing T-shaped block 6h; wherein,

[0030] The supporting U-shaped block 6a and the guide shaft fixing T-shaped block 6h are mechanically fixed to the fuselage housing 2;

[0031] The guide shaft 6f is installed between the supporting U-shaped block 6a and the guide shaft fixing T-shaped block 6h; the movable back plate 6d is slidably installed on the guide shaft (slide rail) 6f;

[0032] A guide post 6b is fixed in the corresponding positioning hole on the right side of the support U-shaped block 6a. A spring (compression spring) 6c is sleeved on the guide post 6b. The two ends of the spring (compression spring) 6c are respectively connected to the support U-shaped block 6h and the movable back plate 6d. The movable back plate 6d is used to fix the shaft core for fixing the drive motor, transmission wheel or cutting tool.

[0033] This utility model tension support system uses the movable back plate to mount a drive motor (with a drive wheel), transmission wheel, or cutting tool. It is used for power equipment or cutting tools that require tension adjustment of the transmission belt, transmission chain, or the cutting tool itself, to achieve adaptive tension matching of the transmission mechanism and to adjust the corresponding tension force according to different tools.

[0034] for Figure 1 , Figure 2 The electric circular saw cutting machine shown has a drive sheave fixed to the motor rotor 5a of the brushless motor 5, and a driven sheave fixed to the movable back plate (or a drive motor with a drive sheave can be fixed). The circular saw is mounted around the two sheaves, and the circular saw is automatically tensioned by the tensioning support system. The motor stator 5b of the brushless motor 5 is fixed to the machine body housing.

[0035] Example 2

[0036] The tensioning support system of this embodiment differs from that of Embodiment 1 in that: the guide shaft is further defined as two, and the two guide shafts 6f are respectively installed in the corresponding holes at the upper and lower ends of the support U-shaped block 6a and between the guide shaft fixing T-shaped block 6h. A linear bearing 6g or a slider is installed on the guide shaft 6f; the upper and lower ends of the movable back plate 6d are provided with transverse through holes, which are interference-fitted with the linear bearing or slider to achieve stable movement of the movable back plate 6d in the left and right directions.

[0037] If precision is not required, the movable backplate 6d can directly mate with the guide shaft 6f through the transverse through holes at its upper and lower ends.

[0038] The tensioning support system of this utility model has a number of springs and guide columns that depend on the object being processed and the tension required by the transmission equipment or processing tool. Generally, there are 2 to 6 springs and guide columns. The length of the guide columns is 20% to 60% of the left and right stroke of the movable back plate to ensure the stability of the spring (compression spring) 6c during extension and retraction.

[0039] Example 3

[0040] The tensioning support system of the transmission mechanism in this embodiment differs from that in Embodiment 1 or Embodiment 2 in that: further, the guide post 6b is fixed from right to left in the corresponding positioning hole on the right side of the middle part of the support U-shaped block by screws, and the spring (compression spring) 6c passes through the guide post 6b. The support U-shaped block and the movable back plate have corresponding holes to accommodate a portion of the spring (compression spring) 6c. The diameter of the hole is about 105% to 120% of the spring (compression spring) 6c, and the depth of the hole is about 5 to 15 mm, depending on the stiffness of the spring and the total length. The stiffness of the spring can be selected from 2 N / m to 10 N / m to meet the tension force required for the transmission of different tools or equipment.

[0041] For ring saw cutting machines, the required tension and bow angle can be met when cutting different materials.

[0042] Example 4

[0043] The tensioning support system of the transmission mechanism in this embodiment differs from the aforementioned embodiments in that: an electric push rod 7 is provided on the machine body housing on the right side of the movable back plate, which is in cooperation with the movable back plate, to facilitate the installation and replacement of the conveyor belt, transmission chain, ring saw or saw blade. The electric push rod 7 is fixed inside the machine body housing, and the telescopic end 7a of the electric push rod is connected to the movable back plate of the tensioning support system. The electric push rod 7 is connected to the power supply through a control switch.

[0044] The control switch can be a three-position self-reset switch. When the three-position self-reset switch of the electric push rod is closed, the electric push rod 7a can move left and right. The electric push rod pushes the movable back plate in the tension support system to move to the left against the spring tension, which is convenient for replacing the conveyor belt, drive chain, wire saw or saw blade. The self-reset switch ensures that the electric push rod will not be continuously powered on, protecting the DC motor.

[0045] The electric push rod 7 has a built-in miniature DC motor and gearbox, and is installed on the right side of the tensioning support system. Under the action of the power supply, the electric push rod pushes the movable back plate 6d to move. When the entire movable back plate is pushed to the left limit, the two side rollers are closest to each other, which is convenient for replacing the ring saw. When the push rod retracts, the spring in the tensioning support system fully opens, the two side rollers move away from each other and tension the ring saw installed on it.

[0046] Figure 8 shows a proximity switch, which is threaded into the housing 2 and used to sense the position of the movable back plate 6d in the tensioning support system. The corresponding working scenario is that the annular cutting wire mounted on the reel 15 accidentally breaks under tension, causing the movable back plate 6d and the driven wheel power transmission system fixed to it to the rightmost end of the housing 2. The installation position and sensing range of proximity switch 8 are precisely sufficient to detect the movable back plate 6d and the driven wheel power transmission system being pushed to the rightmost limit. When the movable back plate 6d is within 2-5mm of proximity switch 8, proximity switch 8 outputs a low-level signal to the high / low level monitoring circuit of the motor control circuit board, and executes motor braking or stopping.

[0047] In the diagram, 6e is the backplate cover, 9 is the high and low level monitoring circuit, 16a is the drive wheel flange, 16b is the drive wheel fixing bolt, 17a is the driven wheel flange, and 17b is the driven wheel fixing bolt.

[0048] This utility model's tensioning support system employs a multi-spring combination tensioning mechanism to achieve a more compact tensioning structure. This allows for more efficient use of limited space to provide higher tension for the tensioning support system, and it is self-adjusting. The parallel spring tensioning support mechanism of this utility model has multiple modes; the tension force can be adjusted according to actual conditions by changing the number of springs and their elastic coefficients. It is suitable for various transmission systems for tensioning loop cutting wires or pulleys and sprockets for machining and transmission.

[0049] The above description is merely a preferred embodiment of this utility model and does not constitute a limitation thereof. Those skilled in the art, guided by existing technology, can make other modifications to the implementation of this utility model without creative effort. Any modifications made within the spirit and principles of this utility model, or any simple substitutions or equivalent replacements made using conventional techniques in the field, should be included within the protection scope of this utility model.

Claims

1. A tensioning support system for a transmission mechanism, configured to cooperate with a power device or a cutting tool, disposed in a device body housing, characterized in that: The tensioning support system comprises a support U-shaped block, a spring, a movable back plate, a guide shaft, and a guide shaft fixing T-shaped block. The support U-shaped block and the guide shaft fixing T-shaped block are mechanically fixed with the fuselage shell. The guide shaft is installed between the support U-shaped block and the guide shaft fixing T-shaped block, and the movable back plate is slidingly installed on the guide shaft. A guide column is fixed in the positioning hole on the right side of the support U-shaped block, and the spring is sleeved on the guide column. The two ends of the spring are respectively connected with the support U-shaped block and the movable back plate. The movable back plate fixing shaft core is used to fix the driving motor, the transmission wheel, or the cutting tool.

2. A tensioning support system for a transmission mechanism according to claim 1, characterised in that: The guide shaft is installed in the corresponding hole position on the upper and lower ends of the support U-shaped block and between the guide shaft fixing T-shaped block. A linear bearing or a sliding block is installed on the guide shaft. The movable back plate is provided with a transverse through hole on the upper and lower ends, which is in interference fit with the linear bearing or the sliding block to realize the stable movement of the movable back plate in the left and right directions.

3. A tensioning support system for a transmission mechanism according to claim 1 or 2, characterised in that: The number of springs and guide columns depends on the tool processing object, and is generally 2-6. The length of the corresponding guide column is 20%-60% of the left and right strokes of the movable back plate to ensure the stability of the spring extension and contraction.

4. A tensioning support system for a transmission mechanism according to claim 3, characterised in that: The guide column is fixed in the corresponding positioning hole on the right side of the middle part of the support U-shaped block from right to left by a screw. The spring passes through the guide column. The support U-shaped block and the movable back plate have corresponding hole positions to accommodate part of the spring. The hole position diameter is about 105%-120% of the spring, and the hole position depth is about 5-15 mm, which depends on the stiffness and total length of the spring. The stiffness of the spring can be selected in the range of 2N / m-10N / m to meet the tensioning force required by different tools or equipment transmission.

5. A tensioning support system for a power transmission mechanism as claimed in claim 1, 2 or 4, characterised in that: An electric push rod for conveniently installing and replacing the conveyor belt, the transmission chain, the ring saw, or the saw blade is provided on the right side of the fuselage shell and cooperates with the movable back plate. The electric push rod is fixed in the fuselage shell, and the extension end of the electric push rod is connected with the movable back plate of the tensioning support system. The electric push rod is connected with the power supply through a control switch.

6. A tensioning support system for a transmission mechanism according to claim 5, characterised in that: The control switch adopts a three-grade self-resetting switch. When the three-grade self-resetting switch of the electric push rod is closed, the left and right movements of the electric push rod can be realized. The movable back plate of the tensioning support system is pushed by the electric push rod to overcome the spring tension and move to the left, which is convenient for replacing the conveyor belt, the transmission chain, the ring saw, or the saw blade. The self-resetting switch ensures that the electric push rod does not work continuously, and protects the DC motor.

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