Thorn wheel for driving roller

Abstract

The utility model discloses a ratchet wheel for a driving roller, which comprises a wheel disc and a plurality of teeth uniformly distributed on the outer circle of the wheel disc, a groove with an arc-shaped bottom surface is arranged between two adjacent teeth of the wheel disc, and the bottom of the groove is lower than the surface of a ratchet wheel of the driving roller. When the ratchet wheel rotates, the ratchet wheel drives the round timber to rotate, part of wood chips fall into the groove, the bottom of the groove is lower than the surface of the ratchet wheel, and the bottom of the groove is sunken towards the center of the ratchet wheel, so that the wood chips cannot be compacted in the groove, fall off along with rotation of the ratchet wheel and cannot be accumulated in the groove; therefore, the problems that the ratchet wheel slips on the round timber due to the fact that the wood chips are thicker and thicker between the teeth of the ratchet wheel and the teeth are inserted into the round timber too shallowly, or the linear velocity of the contact portion of the wood chips and the round timber is different from the linear velocity of the contact portion of the ratchet wheel and the round timber, and the surface of a cut veneer belt becomes rough are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of wood processing machinery, in particular to a thorn wheel for a driving roller. Background Art

[0002] Peeling machine is a kind of machine commonly used in the production of woodworking boards, which is used to process logs of a certain length and diameter into continuous veneer strips. Then the veneer is cut into a certain length by a cutting machine for the subsequent production of plywood or other boards, or for the veneer of other artificial boards.

[0003] like Fig.11 As shown, the current peeling machine clamps the log 14 through the driving roller on the right and the two driven rollers 15 on the left, and then the driving roller drives the log 14 to rotate, and the long strip cutting knife 16 under the driving roller cuts the surface of the log 14 to form a continuous veneer strip 17. The driving rollers are driven to rotate by the motor, and the log is driven to rotate by friction.

[0004] like Figures 8 to 10 As shown, the driving roller includes a driving shaft 7 and twenty-seven working components arranged on the driving shaft 7, each of which includes a spike wheel 4, a ratchet wheel 3 and a scraper 2 which are sequentially sleeved on the driving shaft 7 from left to right. The surface of the ratchet wheel 3 is provided with knurling.

[0005] The shape of the spur wheel 4 is as follows Figure 5 and Figure 6 As shown, it includes a circular wheel disc 21 and a plurality of teeth 18 evenly distributed on the circumference of the wheel disc 21. The diameters of the spur wheel 4, the ratchet wheel 3 and the scraper 2 gradually decrease. There is a hole in the center of the wheel disc 21. The hole of the wheel disc 21 is a protrusion 12 for cooperating with the keyway on the drive shaft 7.

[0006] When the rotary cutter is working, the ratchet 3 drives the log 14 to rotate through friction, and at the same time, the teeth 18 on the thorn wheel 14 penetrate into the log 14, and drive the log 14 to rotate together with the ratchet 3. When the log 14 is cut and the thorn wheel 4 and the ratchet 3 drive the log 14 to rotate, a lot of wood chips 22 will be generated, and some of the wood chips 22 will enter between the teeth 18 of the thorn wheel 4 and accumulate. Since the position of the adjacent teeth 18 of the thorn wheel 4 is an arc-shaped protruding outward, the wood chips 22 that enter between the teeth 18 will be compacted. As the log 14 and the ratchet 3 rotate, the compacted wood chips 22 will become thicker and thicker (such as Figure 7 and Fig. 9 As shown in the figure, the top of the sawdust 22 will eventually be higher than the ratchet 3 and close to the top of the teeth 18. The teeth 18 are inserted into the log 14 and drive the log to rotate, thereby preventing the ratchet 3 from slipping on the surface of the log 14. If the sawdust 22 is too thick, the teeth 18 will not be able to be inserted into the log 14 or the insertion depth will be too shallow, causing slippage.

[0007] In addition, if the top of the wood chips 22 is higher than the ratchet wheel 3, the linear speed of the contact portion between the wood chips 22 and the log 14 will differ from the linear speed of the contact portion between the ratchet wheel 3 and the log 14, thereby making the surface of the cut veneer strip 17 rough. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide a thorn wheel for a driving roller, which is used to solve the problem that the existing thorn wheel will slip due to wood chips accumulated between teeth during operation and cause the surface of the cut single board strip to become rough.

[0009] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0010] A ratchet for a driving roller comprises a wheel disc and a plurality of teeth evenly distributed on the outer circle of the wheel disc, wherein the wheel disc is provided with a groove with an arc bottom surface between two adjacent teeth, and the bottom of the groove is lower than the surface of the ratchet of the driving roller.

[0011] Furthermore, the wheel disc has bosses at positions corresponding to the teeth, the top surfaces of the bosses are arc-shaped, the grooves are arranged between two adjacent bosses, and the arc length of the top of the bosses is greater than the arc length of the roots of the teeth.

[0012] Furthermore, the side surface of the groove coincides with the side surface of the corresponding boss, and the arc surface at the bottom of the groove is tangent to the side surface of the groove.

[0013] Furthermore, the cross-section of the tooth is an isosceles triangle, and the side surface of the groove is parallel to the side surface of the corresponding tooth.

[0014] Furthermore, the height of the teeth is H, the thickness of the veneer strip cut by the peeling machine is δ, and δ-H=0.5 mm.

[0015] Furthermore, the material of the teeth is manganese steel.

[0016] Furthermore, both side surfaces of the tooth are planes, and the angle between the two side surfaces of the tooth is between 20 degrees and 90 degrees.

[0017] Furthermore, the teeth are provided with chamfers at the corners corresponding to the end faces of the wheel discs.

[0018] The positive effects of the utility model are:

[0019] 1. The utility model provides grooves between the teeth of the ratchet wheel. The ratchet wheel drives the log to rotate, and part of the wood chips fall into the grooves. Since the bottom of the groove is lower than the surface of the ratchet wheel and the bottom of the groove is concave toward the center of the ratchet wheel, the wood chips will not be compacted in the grooves. The wood chips will fall with the rotation of the ratchet wheel and will not accumulate in the grooves. Therefore, the wood chips will not accumulate thicker and thicker between the teeth of the ratchet wheel, causing the teeth to be inserted into the log too shallowly, causing the ratchet to slip on the log, or the linear speed of the contact part between the wood chips and the log will be different from the linear speed of the contact part between the ratchet wheel and the log, making the surface of the cut veneer strip rough.

[0020] 2. The ratchet wheel has bosses at the positions corresponding to the teeth. The bosses form shoulders on both sides of the root of the teeth. When the teeth are inserted into the log, the shoulders will contact the surface of the log to limit the depth of the teeth inserted into the log, preventing the teeth from being inserted too deeply into the log and causing the cut veneer strip to be pierced. In addition, the shoulders will also squeeze the wood fibers at the edges of the tooth marks formed by the teeth on the log, so that there will be no burrs on the edges of the tooth marks on the veneer strip, making the surface of the cut veneer strip smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the front view of the utility model;

[0022] Figure 2 yes Figure 1 Cross-sectional view of the middle AA part;

[0023] Figure 3 yes Figure 1 A partial enlarged view of the middle I part;

[0024] Figure 4 yes Figure 2 A partial enlarged view of the middle II part;

[0025] Figure 5 This is the front view of the improved front spur wheel;

[0026] Figure 6 yes Figure 5 A partial enlarged view of the middle III;

[0027] Figure 7 This is a schematic diagram of the accumulation of sawdust between the teeth before improvement;

[0028] Figure 8 is a cross-sectional view of the driving roller before improvement;

[0029] Fig. 9 yes Figure 8 A magnified view of one of the working components;

[0030] Fig.10 yes Fig. 9A partial enlarged view of the middle IV section;

[0031] Fig.11 This is a schematic diagram of the working of the peeling machine when it is cutting logs;

[0032] Fig.12 It is a schematic diagram of the working of the utility model when it contacts with a log;

[0033] In the figure:

[0034] 2. Squeeze and scrape member; 3. Ratchet; 4. Spike wheel; 7. Drive shaft; 14. Log; 15. Driven roller; 16. Cutter; 17. Single plate belt; 18. Teeth; 19. Boss; 20. Groove; 21. Wheel; 22. Wood chips. DETAILED DESCRIPTION

[0035] Example 1

[0036] like Figures 1 to 4 As shown, a ratchet for a driving roller is improved on the basis of the existing ratchet 4, including a wheel disc 21 and a plurality of teeth 18 evenly distributed on the outer circle of the wheel disc 21, and the wheel disc 21 is provided with a groove 20 with an arc-shaped bottom surface between two adjacent teeth 18, and the bottom of the groove 20 is lower than the surface of the ratchet 3 on the driving roller.

[0037] like Fig.12 As shown, the ratchet 3 and the spur wheel 4 drive the log 14 to rotate, and some wood chips 22 fall into the groove 20. However, since the bottom of the groove 20 is lower than the surface of the ratchet 3, and the bottom of the groove 20 is concave toward the center of the spur wheel 3, and the side of the groove 20 is an inclined surface, the width of the groove 20 increases as it is farther away from the center of the spur wheel 4. These wood chips 22 will not be compacted in the groove 20 when rotating with the spur wheel 4, and will remain fluffy. The wood chips 22 will fall with the rotation of the spur wheel 4 and will not accumulate in the groove 20. Therefore, the wood chips 22 will not accumulate thicker and thicker between the teeth 18 of the spur wheel 2, causing the teeth 18 to be inserted too shallowly into the log 14, causing the ratchet 3 to slip on the log 14, or the linear velocity of the contact part between the wood chips 22 and the log 14 and the linear velocity of the contact part between the ratchet 3 and the log 14 will be different, making the surface of the cut veneer strip 17 rough.

[0038] Example 2

[0039] like Figure 3As shown, the wheel disc 21 has bosses 19 at the positions corresponding to the teeth 18, the top surface of the bosses 19 is in the shape of an arc whose center coincides with the center of the wheel disc 21, the groove 20 is arranged between two adjacent bosses 19, and the arc length of the top of the bosses 19 is greater than the arc length of the root of the teeth 18. Therefore, shoulders are formed on both sides of the root of the teeth 18, and when the teeth 18 are inserted into the log 14, the shoulders will abut against the surface of the log 14, limiting the depth of the teeth 18 inserted into the log, preventing the teeth 18 from being inserted too deeply into the log 14 and causing the cut veneer strip 17 to be pierced.

[0040] In addition, the shoulder also squeezes the wood fibers at the edges of the tooth marks formed by the teeth 18 on the log 14, so that no burrs appear at the edges of the tooth marks on the veneer strip 17, and the surface of the cut veneer strip 17 is smoother.

[0041] The side surface of the groove 20 coincides with the side surface of the corresponding boss 19, and the arc surface at the bottom of the groove 20 is tangent to the side surface of the groove 20. The cross section of the tooth 18 is an isosceles triangle, and the side surface of the groove 20 is parallel to the side surface of the corresponding tooth 18. The height of the tooth 18 is H, and the thickness of the single plate strip 17 cut by the peeling machine is δ, then δ-H=0.5mm. Both side surfaces of the tooth 18 are planes, and the angle α between the two side surfaces of the tooth 18 is between 20 degrees and 90 degrees, preferably 46 degrees.

[0042] In actual manufacturing, the wheel disc 21, the boss 19 and the groove 20 are integrally formed, and the teeth 18 are locally subjected to high-frequency quenching treatment to increase the hardness, thereby achieving mass production and improving manufacturing efficiency.

[0043] Example 3

[0044] like Figure 1 and Figure 2 As shown, the teeth 18 are provided with chamfers at the corners corresponding to the end faces of the wheel disc 21. Therefore, the four sides of the teeth 18 are all inclined surfaces, so that the teeth 18 are easier to pull out from the log 14 and it is not easy to bring out the wood fibers on the log 14.

[0045] The above-mentioned embodiments describe content in a relatively detailed and specific manner, and express the preferred embodiments of the present utility model. They are only used to illustrate the technical ideas and features of the present utility model, and their purpose is to enable technicians in this field to understand the content of the present utility model and implement it accordingly, but they are not limited to the present utility model. The patent scope of the present utility model cannot be limited only by this embodiment, that is, any equivalent changes or modifications made to the spirit disclosed by the present utility model, for researchers or technicians in this field, without departing from the structure of the present utility model, local improvements within the system and changes and conversions between subsystems, etc., are still within the patent scope of the present utility model.

Claims

1. A thorn wheel for a driving roller, characterized in that: The invention comprises a wheel disc (21) and a plurality of teeth (18) evenly distributed on the outer circle of the wheel disc (21); the wheel disc (21) is provided with a groove (20) with an arc-shaped bottom surface between two adjacent teeth (18); the bottom of the groove (20) is lower than the surface of the ratchet wheel (3) of the driving roller.

2. A spur wheel for a driving roller according to claim 1, characterized in that: The wheel disc (21) has bosses (19) at locations corresponding to the teeth (18), the top surface of the bosses (19) is arc-shaped, the groove (20) is arranged between two adjacent bosses (19), and the arc length of the top of the boss (19) is greater than the arc length of the root of the teeth (18).

3. A thorn wheel for a driving roller according to claim 2, characterized in that: The side surface of the groove (20) overlaps with the side surface of the corresponding boss (19), and the arc surface at the bottom of the groove (20) is tangent to the side surface of the groove (20).

4. A spur wheel for a driving roller according to claim 2, characterized in that: The cross section of the tooth (18) is an isosceles triangle, and the side surface of the groove (20) is parallel to the side surface of the corresponding tooth (18).

5. A spur wheel for a driving roller according to claim 2, characterized in that: The height of the teeth (18) is H, the thickness of the veneer strip (17) cut by the peeling machine is δ, and δ-H=0.5 mm.

6. A spur wheel for a driving roller according to claim 1, characterized in that: The material of the teeth (18) is manganese steel.

7. A spur wheel for a driving roller according to claim 1, characterized in that: Both side surfaces of the tooth (18) are planes, and the angle between the two side surfaces of the tooth (18) is between 20 degrees and 90 degrees.

8. A spur wheel for a driving roller according to claim 1, characterized in that: The teeth (18) are provided with chamfers at corners corresponding to the end faces of the wheel disc (21).

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