A chain tensioning device for a saw chain

Abstract

The application discloses a chain tensioning adjusting device of a saw chain, which comprises a chain saw body, a saw chain and an adjusting unit arranged on the chain saw body, wherein the adjusting unit comprises a tensioning device, a sliding device and a pushing device, the sliding device is provided with a guide plate for supporting the saw chain, and the pushing device is connected with the tensioning device. The application provides the chain tensioning adjusting device of the saw chain, which can automatically tension the saw chain by the tensioning device when the chain saw is running, and can automatically tension the guide plate when the chain saw is turned off, so that the guide plate moves forward in one direction and the saw chain is tensioned. The saw chain is always in the tensioning state.

Description

Technical Field

[0001] This invention relates to the field of chain tensioning technology, and in particular to a chain tensioning adjustment device for a saw chain. Background Technology

[0002] Chainsaws, as highly efficient cutting tools, are widely used in forestry logging, timber processing, construction, and emergency rescue. The saw chain, as the core working component of a chainsaw, directly affects the cutting efficiency, operational safety, and service life of the equipment. A saw chain typically consists of multiple links hinged together by pins to form a closed loop structure. During operation, it moves at high speed around a guide plate to achieve the cutting function.

[0003] During prolonged operation, the chain links and pins inevitably experience wear due to continuous alternating loads and friction, leading to a gradual increase in the clearance between the links. This increased clearance directly manifests as a loose chain, causing not only increased cutting resistance, higher energy consumption, and reduced cutting accuracy, but also potential malfunctions such as chain skipping, chain detachment, or even breakage, posing a serious threat to operator safety. Furthermore, a loose chain accelerates wear on the guide plates and sprockets, significantly shortening the overall lifespan of the equipment and increasing maintenance costs.

[0004] Currently, the most common method for adjusting saw chain tension in the industry is manual adjustment. As described in publication number CN205415870U, operators visually assess the looseness of the saw chain. Once adjustment is confirmed, the machine is stopped and the adjusting component is manually rotated to adjust the tension by changing the effective length of the saw chain or the position of the guide plate. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a chain tension adjustment device for a saw chain. By rotating the tensioning device, the chain is tensioned while the machine is running, and the guide plate is adjusted after the machine stops, thereby automatically tensioning the chain.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a chain tensioning adjustment device for a chainsaw, comprising a chainsaw body, a chainsaw chain and an adjustment unit disposed on the chainsaw body, the adjustment unit comprising a tensioning device, a sliding device and a pushing device, the sliding device being disposed of with a guide plate to support the chainsaw chain, the pushing device being connected to the tensioning device and driving the tensioning device to change its working position so as to tension the guide plate and the chainsaw chain respectively, the sliding device being disposed of with a locking device so that when the tensioning device tensions the guide plate, the sliding device can drive the guide plate forward, and when the tensioning device tensions the chainsaw chain, the sliding device is prevented from retracting.

[0007] Its beneficial effect is that when the chainsaw is running, the tensioning device can automatically tension the saw chain, and when the chainsaw is turned off, it can automatically tension the guide plate, causing the guide plate to move forward in one direction and thus tighten the saw chain. Each time the machine is turned off, the guide plate can automatically complete the tensioning of the saw chain, so that the saw chain is always in a taut state.

[0008] In the above scheme, preferably, the sliding device includes a base and a sliding seat that is guided and slidably disposed on the base, the guide plate is fixedly disposed on the sliding seat, and the pushing device includes a telescopic member, the two ends of which are respectively rotatably disposed on the base and the tensioning device.

[0009] In the above scheme, preferably, the telescopic member extends when the chainsaw body is started to push the tensioning device to tension the chainsaw chain, and retracts when the chainsaw body is started to tension the guide plate.

[0010] In the above scheme, preferably, the tensioning device includes a rotating component, on which a top contact component is elastically guided and slidably disposed. The pushing device drives the rotating component to rotate, so that the top contact component abuts against the rear end of the guide plate and the inner side of the saw chain respectively.

[0011] In the above scheme, preferably, the rear end of the guide plate is provided with an arc-shaped groove, and the upper end of the arc-shaped groove is provided with a limiting protrusion. The front end face of the top contact member is an arc surface that matches the arc-shaped groove. When the telescopic member retracts, the upper end face of the top contact member abuts against the limiting protrusion.

[0012] In the above scheme, preferably, the sliding seat is equipped with a ratchet rack that is consistent with its sliding direction, and the base is elastically rotatably equipped with a ratchet wheel. The ratchet rack and the ratchet wheel cooperate to make the sliding seat slide only to one side, and reverse sliding is restricted.

[0013] In the above scheme, preferably, a plurality of ratchet wheels are evenly arranged on the base, and the distance between two ratchet wheels is not an integer multiple of the tooth spacing on the ratchet rack, so that when the movement of the ratchet rack is less than the tooth spacing, one of the plurality of ratchet wheels engages with one of the ratchet teeth on the ratchet rack.

[0014] In the above scheme, preferably, a pressing block is slidably arranged on the base, a first elastic element for lifting upward is arranged below the pressing block, and one end of a cable is arranged at the lower end of the pressing block, and the other end is arranged at the front end of the telescopic rod of the telescopic member. When the telescopic member extends, the pressing block moves downward to press and lock the sliding seat.

[0015] In the above scheme, preferably, the chainsaw body is a lithium battery chainsaw and the telescopic component is an electric push rod. When the chainsaw body is turned off, the telescopic component is reset first and then the power is cut off.

[0016] In the above scheme, preferably, the adjustment unit further includes a warning device, which includes a display element disposed on the sliding seat. After the sliding seat moves to a set distance, the display element is used to display a warning color or pattern.

[0017] The beneficial effects of the present invention are as follows: The present invention provides a chain tensioning adjustment device for a saw chain. When the chainsaw is running, the tensioning device can automatically tension the saw chain. When the chainsaw is turned off, it can automatically tension the guide plate, so that the guide plate moves forward in one direction and thus tightens the saw chain. Each time the machine is turned off, the guide plate can automatically complete the tensioning of the saw chain, so that the saw chain is always in a tensioned state. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the present invention.

[0019] Figure 2 This is a partial schematic diagram of the present invention.

[0020] Figure 3 This is a schematic diagram of the adjustment unit of the present invention.

[0021] Figure 4 This is a side view of the adjustment unit of the present invention.

[0022] Figure 5 This is a schematic diagram of the base of the present invention.

[0023] Figure 6 This is a schematic diagram of the sliding seat of the present invention.

[0024] Figure 7 This is a cross-sectional view showing the location of the clamping block in this invention.

[0025] Figure 8 This is a cross-sectional view of the adjustment unit of the present invention.

[0026] Figure 9 This is a partially enlarged view of the location of the triggering device of the present invention. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1:

[0028] See Figures 1-9A chain tension adjustment device for a saw chain includes a chainsaw body 1, which is a lithium-ion battery chainsaw with an internal power supply for driving the device. The chainsaw body 1 is equipped with a saw chain 2, an adjustment unit 3, and a guide plate 4. The adjustment unit 3 includes a tensioning device 31, a sliding device 32, and a pushing device 33. The sliding device 32 includes a base 321 and an upper sliding seat 322 that slides on the base 321. The base 321 has a C-shaped design and is bolted to the chainsaw body 1. Guide rails are provided on the upper and lower inner walls of the C-shape. The upper and lower end faces of the sliding seat 322 have sliding grooves, which guide the sliding seat onto the base. On the upper part 321, the sliding seat 32 is limited in the vertical direction by the upper and lower guide rails, so that it can only move back and forth. Bolts are arranged on the side of the sliding seat 322. The guide plate 4 is fixedly arranged on the bolts of the sliding seat 322 with the nut. The saw chain 2 is sleeved on the guide plate 4 and the sprocket of the chainsaw body 1. The rotation of the sprocket drives the saw chain 2 to rotate on the guide plate 4. The guide plate 4 is used to guide, support and tighten the saw chain 2. The sliding seat 322 moves forward and drives the guide plate 4 to move forward together, thereby tightening the saw chain 2.

[0029] The tensioning device 31 includes a rotating member 311 and a contact member 312. The rotating member 311 is rotatably mounted on a first rotating shaft 3211 of the base 321. A piston guide post 3121 is disposed on the contact member 312, which guides and slides on the rotating member 311. A second elastic member 3122 is sleeved on the piston guide post 3121, with both ends of the second elastic member 3122 contacting the rotating member 311 and the contact member 312, respectively. On 12, under the action of the second elastic member 3122, the top contact member 312 has an elastic top contact force along the piston guide post 3121 relative to the rotating member 311. The front end face of the top contact member 312 is an arc surface, and a groove with the same width and depth as the guide groove on the guide plate 4 is opened on the top contact member 312. When it touches the saw chain 2, the guide plate on the saw chain 2 slides into the groove, so that the saw chain 2 at the top contact position does not deflect and the saw chain 2 can rotate smoothly.

[0030] The guide plate 4 has an arc-shaped groove 41 on its rear end surface, and a limiting protrusion 42 is provided at the upper end of the arc-shaped groove 41 to limit the top contact member 312. The pushing device 33 includes a telescopic member 331 and a tension spring 332. The telescopic member 331 can be an electric telescopic rod or a hydraulic telescopic rod, both of which are electrically controlled to extend and retract. The rear end of the telescopic member 331 is rotatably mounted on the second rotating shaft 3212 of the base 321, and the front end of the telescopic rod is rotatably mounted on the third rotating shaft 3111 located on the rotating member 311. Thus, the extension and retraction of the telescopic member 331 drives the rotating member 311 to generate transmission.

[0031] In the initial state, the telescopic component 331 is in a retracted state, and the front end of the top contact component 312 abuts against the arc-shaped groove 41 of the guide plate 4, while the upper end of the top contact component 312 abuts against the limiting protrusion 42. At the same time, the two ends of the tension spring 332 are connected to the second rotating shaft 3212 and the third rotating shaft 3111. Thus, in the initial state, the tension spring 332 presses the top contact component 312 against the limiting protrusion 42. When the chainsaw body 1 needs to be powered on, the power switch is pressed to first power the telescopic component 331, causing it to extend forward, which in turn drives the rotating component 311 to rotate downward. Then, the top contact component 312 rotates downward synchronously, thus disengaging from the guide plate 4 and pressing against the inner side of the saw chain 2, thereby giving the inner side of the saw chain 2 an outward pushing force, thus tightening the saw chain 2. After the telescopic component 331 is fully extended, the sprocket is controlled to rotate, which in turn drives the saw chain 2 to rotate.

[0032] When it is necessary to shut down, the telescopic component 331 is retracted while the control sprocket stops rotating. The tension spring 332 assists in the retraction of the telescopic component 331, so that after the chainsaw body 1 is shut down, the top contact component 312 re-contacts the guide plate 4, giving the guide plate 4 a forward thrust.

[0033] The sliding seat 322 is provided with a ratchet 323 aligned with the direction of its sliding groove. A ratchet 324 is rotatably mounted on the base 321. When the sliding seat 322 is guided and slidably mounted on the base 321, the ratchet 324 engages with the ratchet 323. The front end of the ratchet teeth of the ratchet 323 is inclined, and the rear end is flat. Thus, the sliding seat 322 can move forward, but when it moves backward, it is limited by the ratchet 324, so that the sliding seat 322 can only move forward.

[0034] Meanwhile, the movement limit of the sliding seat 322 is controlled by the ratchet pitch on the ratchet rack 323. The smaller the ratchet, the smaller the pitch, which in turn makes the movement limit interval of the sliding seat 322 smaller. However, the smaller the ratchet, the locking force for backward limitation also decreases. In order to balance the locking force and reduce the movement limit interval, multiple ratchets 324 are evenly arranged on the base 321 in this invention. The pitch of the ratchet 324 is not an integer multiple of the tooth pitch on the ratchet rack 323. The pitch of the ratchet 324 is X, and the pitch between the teeth on the ratchet rack 323 is Y. X=N*Y+Y / n, where N is an integer and n is also an integer. Y / n is the number of ratchet 324 divided into n parts and the number of ratchet 324 is n+1. Thus, the ratchet rack 323 can be limited by the ratchet 324 when it moves a distance of Y / n, thereby reducing the movement lock interval of the ratchet rack 323.

[0035] A locking seat 327 is elastically slidably disposed on the base 321. The ratchet 324 is rotatably limited and disposed on the shaft on the locking seat 327. Each ratchet 324 is provided with a third elastic element 3241. The third elastic element 3241 is used to give the ratchet 324 an elastic clamping force, so that the ratchet 324 cooperates with the rack 323 to have a downward pressure. One end of the second cable 328 is connected to the locking seat 327, and the other end is disposed on the unlocking handle.

[0036] When it is necessary to reset the sliding seat 322 backward, such as when the saw chain 2 needs to be replaced, the unlocking handle is pulled up, and the locking seat 327 is pulled upward by the second cable 328. As a result, all the ratchet 324 and the ratchet rack 323 are disengaged, thereby eliminating the backward limit of the sliding seat 322, and the sliding seat 322 can move backward to reset.

[0037] The base 321 is provided with a guide groove 3213, and a pressing block 325 is slidably arranged in the guide groove 3213. A first elastic element is arranged in the guide groove 3213. The two ends of the first elastic element respectively abut against the lower end surface of the pressing block 325 and the lower end surface of the guide groove 3213, thereby giving the pressing block 325 a pushing force. One end of the cable 326 is connected to the lower end of the pressing block 325, and the other end of the cable 326 is connected to one end of the second hook spring. The other end of the second hook spring is connected to the third rotating shaft 3111. Thus, when the telescopic member 331 begins to extend, it pulls the pressing block 325 downward through the cable 325, so that the pressing block 325 presses against the ratchet rack 323.

[0038] The clamping block 325 has an elastic pad on its lower end surface. When the top contact 312 rotates downward, the clamping block 325 moves downward synchronously. When the top contact 312 contacts the saw chain 2, the clamping block 325 is already pressed against the ratchet 323, thereby pressing the ratchet 323 and locking the sliding seat 322. When the tensioning device 31 tensions the saw chain 2, the saw chain 2 has a backward reaction force on the guide plate 4. The clamping block 325 locks the sliding seat 322, preventing the saw chain 2 from moving slightly backward due to the reaction force. At the same time, it connects the sliding seat 322 into a whole, preventing the sliding seat 322 from moving when the saw chain 2 rotates, and improving the stability of the saw chain 2 during operation.

[0039] After the telescopic member 331 is fully extended, the top contact member 312 of the tensioning device 31 disengages from the guide plate 4, and the front end face fully contacts the inner side of the saw chain 2. Thus, when the saw chain 2 is running, the tensioning device 31 is used entirely to tension the saw chain 2.

[0040] After use, the saw chain 2 stops rotating and the telescopic component 331 retracts. At this time, the clamping block 325 moves upward under the action of the first elastic component, releasing the clamping of the ratchet 323. Then, after the telescopic component 331 is fully retracted, the top contact component 312 elastically contacts the guide plate 4. If the saw chain 2 stretches due to wear during operation, the top contact component 312 drives the sliding seat 322 to move upward, thereby automatically tightening the saw chain 2 through the moving guide plate 4. At the same time, the moving seat 322 moves in one direction and cannot move backward. Thus, during the operation of the saw chain 2, the locking device 34 tightens the saw chain 2 in real time. After the operation of the saw chain 2 ends, the position of the guide plate 4 is automatically adjusted to adjust the wear and lengthening of the saw chain 2 during operation. This ensures that the guide plate 4 is automatically adjusted after each operation, so that the saw chain 2 is always in a taut state, avoiding the situation where the saw chain 2 is too long and exceeds the adjustment range of the tensioning device 31, preventing the saw chain 2 from being unable to be effectively tightened during operation.

[0041] Its working principle or usage method is as follows: In the initial state, the telescopic component 331 is in a retracted state, and the front end of the top contact component 312 touches the arc-shaped groove 41 of the guide plate 4, tightening the guide plate 4. When the chainsaw body 1 needs to be powered on, the power switch is pressed to first power on the telescopic component 331, and the telescopic component 331 extends forward, driving the rotating component 311 to rotate downward. The top contact component 312 rotates downward simultaneously, thereby disengaging from the guide plate 4 and pressing against the inner side of the saw chain 2, thus giving the inner side of the saw chain 2 an outward pushing force, thereby tightening the saw chain 2. After the telescopic component 331 is fully extended, the sprocket is controlled to rotate, thereby driving the saw chain 2 to rotate.

[0042] After use, the saw chain 2 stops rotating and the telescopic component 331 retracts. At this time, the clamping block 325 moves upward under the action of the first elastic component, releasing the clamping of the ratchet 323. Then, after the telescopic component 331 is fully retracted, the top contact component 312 elastically contacts the guide plate 4. If the saw chain 2 stretches due to wear during operation, the top contact component 312 drives the sliding seat 322 to move upward, thereby automatically tightening the saw chain 2 through the moving guide plate 4. At the same time, the moving seat 322 moves in one direction and cannot move backward. Thus, during the operation of the saw chain 2, the locking device 34 tightens the saw chain 2 in real time. After the operation of the saw chain 2 ends, the position of the guide plate 4 is automatically adjusted to adjust the wear and lengthening of the saw chain 2 during operation. This ensures that the guide plate 4 is automatically adjusted after each operation, so that the saw chain 2 is always in a taut state, avoiding the situation where the saw chain 2 is too long and exceeds the adjustment range of the tensioning device 31, preventing the saw chain 2 from being unable to be effectively tightened during operation.

[0043] Example 2:

[0044] See Figures 1-9 The difference from Embodiment 1 lies in the structure of the sliding device 32; all other aspects are the same. The sliding device 32 is also equipped with a warning device 35, which includes a display element 351 and a triggering device 352. The display element 351 is an LED bead, disposed on the end face of the fixing bolt of the sliding base 322, and emits light or patterns when powered. The triggering device 352 includes a receiving end 3521 and a triggering end 3522. The receiving end 3521 is disposed in the guide groove of the sliding base 322, and is connected to the display element 351 via a wire. Multiple triggering ends 3522 are disposed on the guide rail of the base 321, and each triggering end 3522 is equipped with an elastic telescopic head, which is connected to the controller on the chainsaw body 1.

[0045] Multiple trigger ends 3522 are distributed at different positions on the guide rail. The operator sets the trigger ends 3522 at different positions to connect with the controller according to the performance of each saw chain, and then sets the maximum moving position of the sliding seat 322. After the sliding seat 322 moves forward to the maximum moving position, the elastic telescopic head on the trigger end 3522 docks with the receiving end 3521, and at this time the circuit of the display 351 is connected.

[0046] Since the sliding seat 322 moves every time the machine is turned off, after the circuit of the display component 351 is connected, when the chainsaw body 1 is started again, the display component 351 is powered on and displays a warning color or pattern. At the same time, the controller no longer supplies power to the telescopic component 331 and no longer supplies power to the rotating motor of the chainsaw body 1, so that the saw chain 2 cannot rotate. The chainsaw 2 must be replaced and the sliding seat 322 must be reset before the machine can be powered on and started.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. 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. Such 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 chain tension adjustment device for a saw chain, characterized in that: It includes a chainsaw body (1), on which a saw chain (2) and an adjustment unit (3) are configured. The adjustment unit (3) includes a tensioning device (31), a sliding device (32) and a pushing device (33). The sliding device (32) is equipped with a guide plate (4) to support the saw chain (2). The pushing device (33) is connected to the tensioning device (31) and pushes the tensioning device (31) to change its working position so as to tension the guide plate (4) and the saw chain (2) respectively. The sliding device (32) is also equipped with a locking device, which enables the sliding device (32) to drive the guide plate (4) to move forward when the tensioning device (31) tensions the guide plate (4), and prevents the sliding device (32) from moving backward when the tensioning device (31) tensions the saw chain (2); The pushing device (33) includes a telescopic member (331), and the sliding device (32) includes a base (321). The two ends of the telescopic member (331) are respectively rotatably mounted on the base (321) and the tensioning device (31). The tensioning device (31) includes a rotating part (311), and a top contact part (312) is elastically guided and slidably arranged on the rotating part (311). The pushing device (33) drives the rotating part (311) to rotate, so that the top contact part (312) touches the rear end of the guide plate (4) and the inner side of the saw chain (2) respectively. The telescopic component (331) extends when the chainsaw body (1) is started, pushing the tensioning device (31) to tension the saw chain (2), and retracts when the chainsaw body (1) stops, so that the tensioning device (31) tensions the guide plate (4). When the chainsaw body is powered on and started, the telescopic component is powered on first, and the telescopic component extends forward to tighten the saw chain. After use, the telescopic component retracts, automatically adjusting the guide plate to keep the saw chain taut at all times.

2. The chain tension adjustment device for a saw chain according to claim 1, characterized in that: The sliding device (32) includes a sliding seat (322) that is guided and slidably disposed on a base (321), and the guide plate (4) is fixedly disposed on the sliding seat (322).

3. The chain tension adjustment device for a saw chain according to claim 1, characterized in that: The guide plate (4) has an arc-shaped groove (41) at its rear end, and a limiting protrusion (42) is provided at the upper end of the arc-shaped groove (41). The front end face of the top contact member (312) is an arc surface that is adapted to the arc-shaped groove (41). When the telescopic member (331) retracts, the upper end face of the top contact member (312) touches the limiting protrusion (42).

4. The chain tension adjustment device for a saw chain according to claim 2, characterized in that: The sliding seat (322) is provided with a ratchet (323) that is consistent with its sliding direction, and the base (321) is provided with a ratchet (324) that is elastically rotatable. The ratchet (323) and the ratchet (324) cooperate to make the sliding seat (322) slide only to one side, and the reverse sliding is restricted.

5. The chain tension adjustment device for a saw chain according to claim 4, characterized in that: The base (321) is evenly provided with a plurality of ratchet wheels (324), and the distance between two ratchet wheels (324) is not an integer multiple of the tooth spacing on the ratchet rack (323), so that when the movement of the ratchet rack (323) is less than the tooth spacing, one of the ratchet wheels (324) meshes with one of the ratchet teeth on the ratchet rack (323).

6. The chain tension adjustment device for a saw chain according to claim 2, characterized in that: A pressing block (325) is slidably arranged on the base (321). A first elastic element for upward lifting is arranged below the pressing block (325). One end of a cable (326) is connected to the lower end of the pressing block (325). The other end of the cable (326) is connected to the front end of the telescopic rod of the telescopic member (331). When the telescopic member (331) extends, the pressing block (325) moves downward to press and lock the sliding seat (322).

7. The chain tension adjustment device for a saw chain according to claim 2, characterized in that: The chainsaw body (1) is a lithium battery chainsaw, and the telescopic component (331) is an electric push rod. When the chainsaw body (1) is turned off, the telescopic component (331) is reset first and then the power is cut off.

8. A chain tension adjustment device for a saw chain according to claim 2 or 7, characterized in that: The adjustment unit (3) also includes a warning device (35), which includes a display (351) on the sliding seat (322). After the sliding seat (322) moves to a set distance, the display (351) is used to display a warning color or pattern.

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