Forced feeding device for short pieces of a plunge milling machine
By designing a forced feeding device for short wood pieces in a milling machine, the problems of uneven feeding and low planing accuracy during the planing process of short wood pieces were solved, realizing reliable propulsion and stable conveying of wood, and improving planing quality and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU JIANGJIA MACHINERY
- Filing Date
- 2025-07-16
- Publication Date
- 2026-07-07
AI Technical Summary
Existing milling machines suffer from uneven feeding, uneven planed surfaces, low planing accuracy, and low efficiency when planing short pieces of wood, especially at high speeds.
A forced feeding device for short wood pieces in a milling machine was designed, including a feeding beam and a drive shaft. The upper and lower feeding rollers are connected to the feeding motor through a separate transmission box to ensure that the tangential feeding speeds of the upper and lower feeding rollers are equal. A shock-absorbing structure is adopted, in conjunction with the feeding roller cylinder and shock-absorbing spring, to achieve reliable propulsion and stable conveying of short wood pieces.
It enables stable and rapid feeding of short timber, improves planing accuracy and efficiency, ensures planing quality, and overcomes problems of uneven feeding and vibration.
Smart Images
Figure CN224464880U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a four-sided milling machine in the field of wood processing technology, and more particularly to a feeding device for a four-sided milling machine that can perform high-speed four-sided milling of short pieces of wood. Background Technology
[0002] Finger-jointed boards are made by precisely splicing multiple pieces of wood together using a finger-jointing process. This not only preserves the natural characteristics of the wood but also effectively integrates small pieces of wood, which would otherwise be considered waste or short pieces, into finished products, reducing wood waste. Furthermore, the shorter the pieces of wood spliced using finger-jointed boards, the higher the wood utilization rate. However, when planing short pieces of wood, the limited operating space makes it difficult to clamp and push the wood, affecting the planing effect, limiting the feeding speed and planing speed, and making planing more difficult.
[0003] Existing milling and planing machines have feed rollers that include a follower pressure roller and an active feed roller. The pressure roller only provides downward pressure, while the feed roller provides the pushing force to propel the wood forward. However, when planing short pieces, there is a large unconstrained space between adjacent feed rollers, which makes it impossible to reliably push and feed the short pieces. Especially during high-speed planing, this constraint gap will cause the pushed wood to vibrate, resulting in uneven feed speed and an uneven planed surface.
[0004] Wood is not a homogeneous material; it contains knots, grain, and varies in hardness. These variations in wood texture not only affect the planing force of the planer but also the feeding force. Short blocks of wood may experience pauses or other fluctuations in the feed speed, causing planer vibration and feed roller shaking. This results in repeated planing on the wood surface, creating uneven and pitted surfaces that affect both planing accuracy and efficiency. Utility Model Content
[0005] In view of the above-mentioned differences in the existing technology, the technical problem to be solved by this utility model is to provide a forced feeding device for short wood in a planer and milling machine that can reliably push short wood and produce good processing quality.
[0006] To solve the above-mentioned technical problems, this utility model provides a forced feeding device for short materials in a milling machine, including a feeding beam and a transmission shaft. The transmission shaft, rotatably mounted on the feeding beam, is connected to a feeding motor. A sub-transmission box is also installed on the feeding beam. The transmission shaft is sequentially connected to the upper feeding roller via a corresponding sub-transmission box and an upper feeding roller transmission shaft. The transmission shaft is also sequentially connected to the lower feeding roller via a corresponding sub-transmission box and a lower feeding roller transmission shaft. The tangential feeding speeds of the upper and lower feeding rollers are equal, and the spacing between at least sixteen sequentially adjacent upper feeding rollers is a = 120mm-160mm.
[0007] Preferably, each of the upper feeding rollers corresponds to a feeding roller cylinder.
[0008] Preferably, the feeding crossbeam is slidably supported on the machine body via a crossbeam lifting guide rail, and a crossbeam lifting transmission pair is connected to the lower end of the crossbeam lifting guide rail. The lifting motor drives the crossbeam lifting guide rail through the crossbeam lifting transmission pair.
[0009] Preferably, the lower feed roller is rotatably supported on the machine body by a lower feed roller support; the lower feed roller includes a feed roller spindle, on which a feed roller shell is fitted with a gap, and a shock-absorbing spring and a shock-absorbing top cover are provided between the feed roller shell and the feed roller spindle, with the shock-absorbing top cover located at the outer end of the shock-absorbing spring.
[0010] Preferably, both ends of the feeding roller shell are equipped with feeding roller end caps, which are fixedly installed on the feeding roller spindle.
[0011] Preferably, four damping springs are embedded on the same cross section of the feed roller mandrel, with the damping springs arranged in pairs facing each other, and the damping springs abutting against the inner wall of the feed roller shell through the damping top cover.
[0012] Preferably, each of the shock-absorbing springs corresponds to a shock-absorbing top cover, the top surface of the shock-absorbing top cover is a spherical cap surface, and the shock-absorbing spring is a disc spring.
[0013] Preferably, the gap b between the feed roller mandrel and the feed roller shell is 0.5mm-1.0mm.
[0014] With the above technical solution, since both the upper and lower feeding rollers are connected to the feeding motor via a transmission box and a transmission shaft, both the upper and lower feeding rollers in the feeding device are active rollers with equal tangential feeding speeds. This not only allows for precise control of the feeding speed, making it particularly suitable for the synchronous feeding of short pieces, but also ensures smooth and rapid transport of short pieces, thus guaranteeing reliable and stable wood feeding. Each upper feeding roller has a corresponding feeding roller cylinder, enabling precise downward pressure feeding of each short piece of wood, overcoming the interdependence between feeding rollers, and resulting in more precise feeding. The use of a shock-absorbing structure on the lower feeding roller improves feeding accuracy and stability, enhances the planing accuracy of the planer, and helps ensure the planing quality of short pieces of wood. The optimized distance between the feeding rollers ensures continuous and uninterrupted feeding of short pieces of wood, resulting in smoother wood feeding. Attached Figure Description
[0015] The following description, in conjunction with the accompanying drawings and specific embodiments, further illustrates the present invention's forced feeding device for short materials in a milling machine.
[0016] Figure 1This is a front structural view of a specific embodiment of the short material forced feeding device for a milling machine according to this utility model;
[0017] Figure 2 yes Figure 1 The three-dimensional structural diagram of the feeding device in the embodiment shown is shown.
[0018] Figure 3 yes Figure 2 Front view of the structure;
[0019] Figure 4 yes Figure 3 Cross-sectional view of the middle and lower feed rollers;
[0020] Figure 5 yes Figure 4 A-A cross-section;
[0021] Figure 6 yes Figure 4 View from direction A;
[0022] Figure 7 yes Figure 4 Installation structure diagram of the intermediate damping spring;
[0023] Figure 8 yes Figure 7 Structural diagram of the middle shock absorber top cover;
[0024] Figure 9 yes Figure 4 Structural diagram of the end cap of the feed roller;
[0025] Figure 10 yes Figure 4 Cross-sectional view of the feed roller shell;
[0026] Figure 11 yes Figure 10 View from direction B;
[0027] Figure 12 yes Figure 1 The diagram shows an installation structure of the upper feed roller in the embodiment shown.
[0028] Figure 13 yes Figure 12 Front view of the structure;
[0029] Figure 14 yes Figure 1 The embodiment shown is another installation structure diagram of the feed roller;
[0030] Figure 15 yes Figure 14 Front structural diagram.
[0031] In the diagram, 1—feeding motor, 2—transmission box, 3—transmission shaft, 4—shaft coupling, 5—feeding beam, 6—lower feeding roller drive shaft, 7—upper feeding roller drive shaft, 8—upper feeding roller, 9—lower feeding roller, 10—lower feeding roller support, 11—beam lifting guide rail, 12—beam lifting transmission pair, 13—lifting motor, 14—feeding roller spindle, 15—feeding roller end cover, 16—feeding roller shell, 17—shock-absorbing top cover, 18—shock-absorbing spring, 19—end 20—Upper feed roller support, 21—Feed roller cylinder, 22—Feed roller shaft seat, 23—Feed roller transmission box, 24—Feed roller drive gear, 25—Drive wheel, 26—Feed roller mandrel, 27—Feed roller short mandrel, 28—Machine body, 29—First lower cutter shaft, 30—Second lower cutter shaft, 31—Front right vertical cutter shaft, 32—Front left vertical cutter shaft, 33—Rear right vertical cutter shaft, 34—Rear left vertical cutter shaft, 35—First upper cutter shaft, 36—Second upper cutter shaft. Detailed Implementation
[0032] like Figure 1 The short-material forced feeding device of the milling and planing machine shown has a worktable on the machine body 28 for supporting the planed wood. The device is located on the right side of the machine body 28. The device includes several upper feed rollers 8 and lower feed rollers 9. The upper feed rollers 8 are located above the worktable on the machine body 28, while the lower feed rollers 9 are rotatably positioned on the worktable. The upper feed rollers 8 and lower feed rollers 9 are located on two parallel horizontal planes.
[0033] A first lower cutter shaft 29 and a second lower cutter shaft 30 are arranged sequentially at the front end of the worktable of the machine body 28. A first upper cutter shaft 35 and a second upper cutter shaft 36 are arranged at intervals above the rear end of the worktable of the machine body 28. The first upper cutter shaft 35 and the second upper cutter shaft 36, which are on the same planing plane, are parallel to the second lower cutter shaft 30 in space. The second lower cutter shaft 30 and the first lower cutter shaft 29 are on the same planing plane, and the center lines of the second lower cutter shaft 30 and the first lower cutter shaft 29 intersect each other. A front right vertical cutter shaft 31, a front left vertical cutter shaft 32, a rear right vertical cutter shaft 33, and a rear left vertical cutter shaft 34 are vertically arranged in the middle section of the worktable of the machine body 28. The wood feed channel is located within the space enclosed by the vertical plane containing the front right vertical cutter shaft 31 and the rear right vertical cutter shaft 33, the vertical plane containing the front left vertical cutter shaft 32 and the rear left cutter shaft 34, the horizontal plane containing the first lower cutter shaft 29 and the second lower cutter shaft 30, and the horizontal plane containing the first upper cutter shaft 35 and the second upper cutter shaft 36.
[0034] Twenty-two upper feeding rollers 8 are arranged at the front end of the rear left vertical cutter shaft 34. The roller spacing a between two adjacent upper feeding rollers 8 is 138mm, preferably a = 120mm-160mm. Nine upper feeding rollers 8 are also arranged at the rear end of the rear left cutter shaft 34. In order to ensure reliable feeding of short wood pieces, the spacing a between at least sixteen sequentially adjacent upper feeding rollers 8 is controlled between 120mm and 160mm.
[0035] like Figure 2 , Figure 3 As shown, beam lifting guide rails 11 are fixedly connected to both ends of the horizontally arranged feeding beam 5. The beam lifting guide rails 11 are perpendicular to the feeding beam 5 and are slidably supported in the slide groove of the machine body 28. A beam lifting transmission pair 12 is connected to the lower end of the beam lifting guide rail 11. The beam lifting transmission pair 12 is a screw and nut pair, with the screw fixedly connected to the sliding guide rail and the nut rotatably supported on the machine body 28. The nut of each beam lifting transmission pair 12 is connected to the lifting transmission shaft through a worm gear pair. The lifting transmission shaft is connected to the lifting motor 13 through a coupling. Starting the lifting motor 13 drives the beam lifting transmission pair 12 and the beam lifting guide rail 11. The beam lifting guide rail 11 can drive the feeding beam 5 to move up and down, thereby changing the interval between the lower feeding roller 9 and the upper feeding roller 8 to adapt to the planing requirements of wood with different thicknesses.
[0036] Fifteen sub-transmission boxes 2 are installed on the feeding beam 5. A feeding motor 1 is connected to one end of a transmission shaft 3 passing through each sub-transmission box 2. The transmission shaft 3 is composed of five short shafts connected by a through-shaft coupling 4. The sub-transmission box 2 is a bevel gear transmission box. The lower feeding roller 9 is connected to its corresponding sub-transmission box 2 via a corresponding lower feeding roller transmission shaft 6; similarly, the upper feeding roller 8 is also connected to its corresponding sub-transmission box 2 via a corresponding upper feeding roller transmission shaft 7. Both the upper feeding roller transmission shaft 7 and the lower feeding roller transmission shaft 6 are connected using a cross-shaft universal joint. Considering the installation space of the transmission structure of the upper feeding roller 8, one upper feeding roller transmission shaft 7 can drive one upper feeding roller 8, two upper feeding rollers 8, or three upper feeding rollers 8. When one upper feeding roller transmission shaft 7 drives two or three upper feeding rollers 8, the two or three upper feeding rollers 8 rotate synchronously through gear transmission. Therefore, in the above structure, each upper feed roller 8 is an active feed roller; correspondingly, the lower feed roller 9 is also an active feed roller. Each upper feed roller 8 is hinged with a feed roller cylinder 21 to individually control the feeding pressure of each upper feed roller 8.
[0037] like Figure 4 , Figure 5As shown, the lower feed roller 9 includes a feed roller spindle 14, which is rotatably supported on the machine body 28 via a lower feed roller support 10. A feed roller shell 16 is fitted onto the feed roller spindle 14 with a gap, the gap b between the feed roller spindle 14 and the feed roller shell 16 being 0.6 mm. Depending on the texture, hardness, and other properties of the wood, the gap b between the feed roller spindle 14 and the feed roller shell 16 should be controlled between 0.5 mm and 1.0 mm.
[0038] Twelve radially arranged damping springs 18 are embedded in the feed roller spindle 14. These 12 damping springs 18 are respectively embedded in three sections of the feed roller spindle 14. Four spring mounting holes are provided at two mutually perpendicular diameter ends on each section, and one damping spring 18 is installed in each spring mounting hole. A damping top cover 17 is installed at the outer end of each damping spring 18. Feed roller end covers 15 are installed at both ends of the feed roller shell 16, and each feed roller end cover 15 is fixedly connected to the feed roller spindle 14 by end cover bolts 19. Four tenons are provided on the feed roller end cover 15, and these four tenons are inserted into mortise grooves in the inner wall of the feed roller shell 16.
[0039] like Figure 7 , Figure 8 As shown, the damping spring 18 is made of stacked disc springs, which are fitted into corresponding spring mounting holes. The guide post of the damping top cover 17 is inserted into the center hole of the disc spring, and the top of the damping top cover 17 is a spherical crown.
[0040] like Figure 9 , Figure 10 and Figure 11 As shown, the feed roller shell 16 is a cylindrical structure, and four tenon grooves are provided on the inner shell walls at both ends of the feed roller shell 16. The center hole of the feed roller end cover 15 is fitted onto the feed roller spindle 14, and is installed on the journal of the feed roller spindle 14 through a transmission key. Four protruding tenons are provided on the outer periphery of the feed roller end cover 15.
[0041] like Figure 12 , Figure 13The upper feed roller assembly structure shown includes three upper feed rollers 8. Feed roller bearing seats 22 are hinged on both sides of the upper feed roller support 20 mounted on the machine body 28. Two upper feed roller spindles 26 rotate on each feed roller bearing seat 22. One of the upper feed roller spindles 26 is connected to the sub-transmission box 2 via a corresponding upper feed roller drive shaft 7. Each upper feed roller 8 is rotatably supported on the upper feed roller spindle 26. A feed roller cylinder 21 is hinged between each feed roller bearing seat 22 and the upper feed roller support 20. A feed roller transmission box 23 is also supported on one of the upper feed roller spindles 26, and a feed roller cylinder 21 is also hinged between the feed roller transmission box 23 and the upper feed roller support 20. The feed roller drive box 23 supports a shorter upper feed roller spindle 27, and another upper feed roller 8 is rotatably supported on the shorter upper feed roller spindle 27. The upper feed roller spindle 26 and the upper feed roller spindle 27 rotate synchronously through gear transmission.
[0042] like Figure 14 , Figure 15 Another upper feed roller assembly structure is shown, which includes two upper feed rollers 8. Feed roller bearing seats 22 are hinged on both sides of the upper feed roller support 20 mounted on the machine body 28. A feed cylinder 21 is hinged between the feed roller bearing seat 22 and the upper feed roller support 20. Each feed roller bearing seat 22 rotatably supports a feed roller spindle 26, and each feed roller spindle 26 is connected to the sub-transmission box 2 via a corresponding upper feed roller drive shaft 7.
[0043] The above are some preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make improvements and substitutions to the technical solutions described in the foregoing embodiments. Such substitutions and improvements that violate the spirit and principles of the present utility model shall fall within the protection scope of the present utility model.
Claims
1. A forced feeding device for short materials in a milling machine, comprising a feeding beam (5) and a transmission shaft (3), wherein the transmission shaft (3), rotatably mounted on the feeding beam (5), is connected to a feeding motor (1), characterized in that: The feeding beam (5) is also equipped with a sub-transmission box (2), and the transmission shaft (3) is connected to the upper feeding roller (8) in sequence through the corresponding sub-transmission box (2) and the upper feeding roller transmission shaft (7); the transmission shaft (3) is also connected to the lower feeding roller (9) in sequence through the corresponding sub-transmission box (2) and the lower feeding roller transmission shaft (6); the tangential feeding speed of the upper feeding roller (8) and the lower feeding roller (9) is equal, and the spacing between at least sixteen adjacent upper feeding rollers (8) is a = 120mm-160mm.
2. The forced feeding device for short materials in a milling machine according to claim 1, characterized in that: Each of the upper feeding rollers (8) corresponds to a feeding roller cylinder (21).
3. The forced feeding device for short materials in a milling machine according to claim 1, characterized in that: The feeding beam (5) is slidably supported on the machine body (28) by the beam lifting guide rail (11). The lower end of the beam lifting guide rail (11) is connected to the beam lifting transmission pair (12). The lifting motor (13) drives the beam lifting guide rail (11) through the beam lifting transmission pair (12).
4. The forced feeding device for short materials in a milling machine according to claim 1, 2 or 3, characterized in that: The lower feed roller (9) is rotatably supported on the machine body (28) by the lower feed roller support (10); the lower feed roller (9) includes a feed roller spindle (14), on which a feed roller shell (16) is fitted with a gap, and a shock-absorbing spring (18) and a shock-absorbing top cover (17) are provided between the feed roller shell (16) and the feed roller spindle (14), and the shock-absorbing top cover (17) is located at the outer end of the shock-absorbing spring (18).
5. The forced feeding device for short materials in a milling machine according to claim 4, characterized in that: Both ends of the feed roller shell (16) are equipped with feed roller end caps (15), which are fixedly installed on the feed roller spindle (14).
6. The forced feeding device for short materials in a milling machine according to claim 4, characterized in that: Four damping springs (18) are embedded on the same cross section of the feed roller spindle (14). The damping springs (18) are arranged in pairs opposite each other. The damping springs (18) abut against the inner wall of the feed roller shell (16) through the damping top cover (17).
7. The forced feeding device for short materials in a milling machine according to claim 6, characterized in that: Each shock-absorbing spring (18) corresponds to a shock-absorbing top cover (17), the top surface of the shock-absorbing top cover (17) is a spherical cap surface, and the shock-absorbing spring (18) is a disc spring.
8. The forced feeding device for short materials in a milling machine according to claim 5, 6 or 7, characterized in that: The gap b between the feed roller mandrel (14) and the feed roller shell (16) is 0.5mm-1.0mm.