CN209937120U - Timber fixed length dissection device - Google Patents

Abstract

The utility model belongs to the technical field of timber dissection, in particular to a timber fixed-length dissection device, which comprises a first conveying device, a second conveying device, a dissection device and a PLC control system, wherein the first conveying device and the second conveying device respectively comprise a rack, a conveying mechanism arranged on the rack and a driving mechanism used for driving the conveying mechanism, the left side and the right side of each rack are respectively provided with a clasping mechanism, each rack is provided with a guide mechanism used for assisting the clasping mechanism to clasp tightly, and the dissection device is arranged between the first conveying device and the second conveying device; the utility model discloses two on first conveyor and second conveyor hold tightly mechanism and guiding mechanism can be so that to the fixed effect of timber better, be convenient for cut off, can guarantee simultaneously that the dissection device is higher when cutting off timber under PLC control system's cooperation, and timber length after the dissection is unanimous, and the accuracy is higher, makes things convenient for people's use more.

Description

Timber fixed length dissection device

Technical Field

The utility model belongs to the technical field of timber dissection, concretely relates to timber fixed length dissection device.

Background

The wood has the advantages of light weight, high strength-weight ratio, good elasticity, impact resistance, rich and beautiful texture and color, easy processing and the like, is listed as an important raw material from ancient times to present, and the wood industry also occupies an important position in national economy due to low energy consumption, less pollution and renewable resources.

In order to conveniently utilize or reprocess timber, often need carry out the fixed length dissection to timber raw materials, and present timber dissection device is adding man-hour at carrying out timber, and the most timber that exists the operation complicacy or after the cutting scheduling problem that differs in size to can make people very inconvenient when timber uses, and cause the inefficiency of timber dissection.

Disclosure of Invention

To solve the problems set forth in the background art described above. The utility model provides a timber fixed length dissection device has that timber length after the cutting is unanimous, easy operation, efficient characteristics of dissection.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a timber fixed length dissection device, includes first conveyor, second conveyor, dissection device and PLC control system, first conveyor and second conveyor all include the frame, set up transport mechanism in the frame and be used for driving transport mechanism's actuating mechanism, all are provided with in the left and right sides of every frame and embrace tightly the mechanism, are provided with fixed length stop mechanism on second conveyor, the dissection device sets up between first conveyor and second conveyor.

Preferably, the sectioning device comprises a support frame, two parallel guide rails are fixedly connected to the support frame, the support frame is slidably connected with a first fixing frame through the two guide rails, a cutting mechanism is fixedly connected to the first fixing frame, a first air cylinder is further arranged on the support frame, the outer end of the first air cylinder is fixedly connected with the support frame, and the inner end of the first air cylinder is fixedly connected with the first fixing frame.

Preferably, cutting mechanism includes motor, action wheel, follows driving wheel, pivot and saw bit, motor fixed connection is on the upper portion of first mount, the output shaft and the action wheel fixed connection of motor, the action wheel passes through the conveyer belt and is connected with the transmission of following driving wheel, follow the one end fixed connection of driving wheel and pivot, the other end fixed connection of saw bit and pivot is worn to be equipped with two at least first bearings in the pivot, and every first bearing all passes through bearing frame fixed connection on first mount.

Preferably, every enclasping mechanism all includes second mount, second cylinder and embraces the pole of enclasping, second mount and frame fixed connection, the outer end and the second mount of second cylinder are articulated, the inner of second cylinder with embrace the pole articulated, embrace the bottom and the second mount swing joint of pole of enclasping.

Preferably, the inner side surface of each holding rod is provided with a plurality of pointed protrusions.

Preferably, all be provided with in every frame and be used for assisting to hold the guiding mechanism that the mechanism held tightly and hold work tightly, every guiding mechanism all includes third mount, third cylinder, guide bar and direction wheelset, third mount and frame fixed connection, the outer end of third cylinder is articulated with the third mount, the inner of third cylinder is articulated with the guide bar, the bottom and the third mount swing joint of guide bar, fixedly connected with buffer board on the guide bar, the direction wheelset is including wearing to establish second bearing and a plurality of fixed connection gear piece on the second bearing of connection at the guide bar top.

Preferably, a plurality of supporting assemblies are fixedly connected to the conveying mechanisms of the first conveying device and the second conveying device, and each supporting assembly comprises two triangular plates which are arranged oppositely.

Preferably, the fixed length stops the mechanism and includes fourth mount, fourth cylinder, connecting rod and blocks the piece, fourth mount fixed connection is in the frame from the specific distance department of dissection device, the outer end and the fourth mount of fourth cylinder are articulated, the inner of fourth cylinder is articulated with the connecting rod, the bottom and the fourth mount swing joint of connecting rod, block piece fixed connection on the top of connecting rod.

Preferably, the left side and the right side of one end, close to the cutting device, of the second conveying device are provided with inclined limiting plates.

Preferably, the PLC control system includes a PLC controller disposed at the first conveying device or the second conveying device, a pressure switch disposed at each second cylinder, a first photoelectric sensor disposed at a position corresponding to each guiding mechanism, a second photoelectric sensor disposed at the tail end of the first conveying device, and a third photoelectric sensor disposed at the fixed-length blocking mechanism, wherein signal output ends of the pressure switch, the first photoelectric sensor, the second photoelectric sensor, and the third photoelectric sensor are connected to a signal input end of the PLC controller, and signal output ends of the PLC controller are connected to signal input ends of the first cylinder, the second cylinder, the third cylinder, and the fourth cylinder.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses two on first conveyor and second conveyor hold tightly mechanism and guiding mechanism can be so that fixed effect to timber is better, be convenient for cut off, can guarantee that the dissection device is higher when cutting off timber under the cooperation of pressure switch and PLC controller simultaneously, simultaneously at first photoelectric sensor, the second photoelectric sensor, under mutually supporting of third photoelectric sensor and PLC controller, can be so that timber length after the dissection is unanimous, the accuracy is higher, make things convenient for people's use more.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of the present invention from the top;

fig. 2 is a schematic front sectional view of the first conveying device of the present invention;

fig. 3 is a schematic front sectional view of the second conveying device of the present invention;

FIG. 4 is a schematic view of the cutting device according to the present invention;

in the figure: 1 a first conveying device, 2 a second conveying device, 3 a segmenting device, 31 a support frame, 32 a guide rail, 33 a first fixing frame, 34 a first air cylinder, 351 a motor, 352 a driving wheel, 353 a driven wheel, 354 a rotating shaft, 355 a saw blade, 356 a conveying belt, 357 a first bearing, 358 a bearing seat, 41 a rack, 42 a conveying mechanism, 43 a driving mechanism, 5 a clasping mechanism, 51 a second fixing frame, 52 a second air cylinder, 53 a clasping rod, 54 a pointed protrusion, 6 a guiding mechanism, 61 a third fixing frame, 62 a third air cylinder, 63 a guiding rod, 64 a second bearing, 65 a gear piece, 66 a buffer plate, 7 a triangular plate, 8 a fixed-length blocking mechanism, 81 a fourth fixing frame, 82 a fourth air cylinder, 83 a connecting rod, 84 a blocking piece, 9 a limit plate, 10 a PLC (programmable logic controller), 11 a pressure switch, 12 a first photoelectric sensor, 13 a second photoelectric sensor and 14 a third photoelectric sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Examples

Referring to fig. 1-4, the present embodiment provides the following technical solutions: a timber fixed length cutting device comprises a first conveying device 1, a second conveying device 2, a cutting device 3 and a PLC control system, wherein the first conveying device 1 and the second conveying device 2 respectively comprise a rack 41, a conveying mechanism 42 arranged on the rack 41 and a driving mechanism 43 used for driving the conveying mechanism 42, the left side and the right side of each rack 41 are respectively provided with a clasping mechanism 5, each rack 41 is provided with a guide mechanism 6 used for assisting the clasping mechanism 5 to clasp tightly, the second conveying device 2 is also provided with a fixed length blocking mechanism 8, the cutting device 3 is arranged between the first conveying device 1 and the second conveying device 2, the two clasping mechanisms 5 are arranged, the clasping effect on timber is better, when the cutting device 3 cuts the timber, the fixed length stability of the timber can be ensured, the cutting is convenient, the fixed length blocking mechanism and the PLC control system are arranged, can make this timber fixed length dissection device when carrying out the dissection to timber, the timber length after the cutting is unanimous, and is more accurate, and the security is higher.

Specifically, sectioning device 3 includes support frame 31, guide rail 32 of two parallels of fixedly connected with on support frame 31, support frame 31 has first mount 33 through two guide rail 32 sliding connection, fixedly connected with cutting mechanism on first mount 33, still be provided with first cylinder 34 on support frame 31, the outer end and the support frame 31 fixed connection of first cylinder 34, the inner and the first mount 33 fixed connection of first cylinder 34, under PLC control system's control, steerable first cylinder 34 extends or shortens, thereby make first mount 33 carry out the ascending removal in left and right sides on support frame 31, and then be convenient for set up the cutting mechanism on first mount 33 and accomplish the cutting to the timber raw materials.

Specifically, the cutting mechanism includes a motor 351, a driving wheel 352, a driven wheel 353, a rotating shaft 354 and a saw blade 355, the motor 351 is fixedly connected to the upper portion of the first fixing frame 33, an output shaft of the motor 351 is fixedly connected to the driving wheel 352, the driving wheel 352 is in transmission connection with the driven wheel 353 through a transmission belt 356, the driven wheel 353 is fixedly connected to one end of the rotating shaft 354, the saw blade 355 is fixedly connected to the other end of the rotating shaft 354, at least two first bearings 357 are arranged on the rotating shaft 354 in a penetrating manner, each first bearing 357 is fixedly connected to the first fixing frame 33 through a bearing seat 358, the output shaft of the motor 351 can rotate under the control of a switch, the rotating shaft 354 can be driven to rotate through the transmission of the driving wheel 352, the transmission belt 356 and the driven wheel 353, so that the saw blade 355 is driven to rotate.

Specifically, every enclasping mechanism 5 all includes second mount 51, second cylinder 52 and enclasping pole 53, second mount 51 and frame 41 fixed connection, the outer end of second cylinder 52 is articulated with second mount 51, the inner of second cylinder 52 with enclasping pole 53 is articulated, enclasping pole 53's bottom and second mount 51 swing joint, under PLC control system's control, when control second cylinder 52 extends, because the outer end of second cylinder 52 is articulated with second mount 51, the inner of second cylinder 52 with enclasping pole 53 is articulated, enclasping pole 53's bottom and second mount 51 swing joint, can drive enclasping pole 53 rotatory, until accomplishing the fixed work to timber.

Specifically, every medial surface of embracing pole 53 all is provided with a plurality of point type arch 54, and through setting up a plurality of point type arch 54 at the medial surface of embracing pole 53, can make to embrace pole 53 better to the fixed effect of timber.

Specifically, each guide mechanism 6 comprises a third fixing frame 61, a third cylinder 62, a guide rod 63 and a guide wheel set, the third fixing frame 61 is fixedly connected with the frame 41, the outer end of the third cylinder 62 is hinged with the third fixing frame 61, the inner end of the third cylinder 62 is hinged with the guide rod 63, the bottom end of the guide rod 63 is movably connected with the third fixing frame 61, a buffer plate 66 is fixedly connected on the guide rod 63, the guide wheel set comprises a second bearing 64 connected with the top end of the guide rod 63 in a penetrating manner and a plurality of gear sheets 65 fixedly connected with the second bearing 64, under the control of a PLC control system, when the third cylinder 62 is controlled to extend, because the outer end of the third cylinder 62 is hinged with the third fixing frame 61, the inner end of the third cylinder 62 is hinged with the guide rod 63, the bottom end of the guide rod 63 is movably connected with the third fixing frame 61, the guide rod 63 can be driven to rotate, until being located the gear piece 65 and the timber contact of guide bar 63 top department, gear piece 65 can roll and can give timber certain pressure this moment on timber, can make timber move on transport mechanism 42 more stable, make things convenient for next to hold mechanism 5 tightly to the work of holding of timber, the setting of buffer board 66, when there is the arch on timber and when the guide bar 63 position, buffer board 66 can play the cushioning effect, make guide bar 63 raise, the timber process of being convenient for, can effectively avoid the arch on the timber to cause the damage to guide mechanism 6.

Specifically, equal fixedly connected with a plurality of supporting component on the transport mechanism 42 of first conveyor 1 and second conveyor 2, every supporting component all includes two triangle-shaped boards 7 that set up relatively, through set up a plurality ofly on transport mechanism 42 to relative triangle-shaped board 7, can play limiting displacement to timber, through the frictional force between increase timber and the transport mechanism 42 make timber move more stable on transport mechanism 42, can not take place the skew.

Specifically, the fixed-length blocking mechanism 8 comprises a fourth fixing frame 81, a fourth cylinder 82, a connecting rod 83 and a blocking sheet 84, the fourth fixing frame 81 is fixedly connected to the frame 41 at a specific distance from the sectioning device 3, the outer end of the fourth cylinder 82 is hinged to the fourth fixing frame 81, the inner end of the fourth cylinder 82 is hinged to the connecting rod 83, the bottom end of the connecting rod 83 is movably connected to the fourth fixing frame, the blocking sheet 84 is fixedly connected to the top end of the connecting rod 83, the fixed-length blocking mechanism 8 can be arranged at a corresponding distance from the saw blade 355 according to the length of the required wood, under the control of the PLC control system, when the fourth cylinder 82 is controlled to extend, because the outer end of the fourth cylinder 82 is hinged to the fourth fixing frame, the inner end of the fourth cylinder 82 is hinged to the connecting rod 83, and the bottom end of the connecting rod 83 is movably connected to the fourth fixing frame, the connecting rod 83 can be driven to rotate until the blocking sheet 84, when the wood moves forwards to a corresponding distance, the first conveying device 1 and the second conveying device 2 stop operating, and the blocking piece 84 is arranged, so that when the first conveying device 1 and the second conveying device 2 stop operating, the wood can be effectively prevented from continuously moving forwards under the action of inertia, and the accuracy of the length of the cut wood is ensured.

Specifically, the left and right sides that is close to 3 one ends of segmenting device all is provided with the limiting plate 9 of slope on second conveyor 2, and limiting plate 9's setting can make timber enter into second conveyor 2 back from first conveyor 1, can not take place the ascending skew of left and right sides, and is more stable.

Specifically, the PLC control system includes a PLC controller 10 disposed at the first conveying device 1 or the second conveying device 2, a pressure switch 11 disposed at each second cylinder 52, a first photoelectric sensor 12 disposed at a corresponding position of each guiding mechanism 6, a second photoelectric sensor 13 disposed at a tail end of the first conveying device 1, and a third photoelectric sensor 14 disposed at the fixed-length blocking mechanism 8, signal output ends of the pressure switch 11, the first photoelectric sensor 12, the second photoelectric sensor 13, and the third photoelectric sensor 14 are all connected with a signal input end of the PLC controller 10, signal output ends of the PLC controller 10 are respectively connected with signal input ends of the first cylinder 34, the second cylinder 52, the third cylinder 62, and the fourth cylinder 82, the PLC controller 10, the pressure switch 11, the first photoelectric sensor 12, the second photoelectric sensor 13, and the third photoelectric sensor 14 are disposed, can make this timber fixed length dissection device have automatic fixed, the fixed length cutting function of accomplishing timber, and have fixed effectual, work process factor of safety is high, and timber length after the cutting is unanimous, and the advantage that the accuracy is high, and when using, first photoelectric sensor and third sensor all have the guard plate to protect it, can avoid timber to cause the damage to it.

The working principle and the using flow of the embodiment are as follows: when the utility model is used, firstly, the driving mechanism 43 of the first conveying device 1 and the second conveying device 2 is operated to drive the transmission mechanism 42 on the first conveying device 1 and the second conveying device 2 to operate through the control switch, the output shaft of the motor 351 in the segmenting device 3 is rotated through the control switch, the rotating shaft 354 and the saw blade 355 can be driven to rotate under the transmission connection of the driving wheel 352, the transmission belt 356 and the driven wheel 353, after the feeding mechanism provides wood material on the first conveying device 1, the wood can move forward under the driving of the transmission mechanism 42 of the first conveying device 1, when the wood moves to the guiding mechanism 6 of the first conveying device 1, under the cooperation of the PLC 10 and the first photoelectric sensor 12 on the first conveying device 1, the third cylinder 62 on the first conveying device 1 can be controlled to extend, and the guiding rod 63 can be driven to rotate, until the gear piece 65 on the guide rod 63 contacts with the wood, at this time, the gear piece 65 is just above the wood, so that the wood can move more stably on the first conveying device 1, when the wood moves to the tail end of the first conveying device 1, under the cooperation of the second photoelectric sensor 13 and the PLC controller 10, the first conveying device 1 can be controlled to stop running, at this time, the wood can continue to move forward to a small distance under the inertia effect, then the two second cylinders 52 on the first conveying device 1 can be controlled to extend, the holding rod 53 can be driven to rotate until the holding work on the wood is completed, at this time, the pressure switch 11 on the first conveying device 1 can determine whether the holding degree of the holding rod 53 to the wood meets the safe operation requirement by detecting the air pressure value in the second cylinder 52 connected with the pressure switch 11, until the holding force of the holding rod 53 to the wood reaches the safe standard, under the control of the PLC controller 10, the first cylinder 34 can be controlled to extend, so as to cause the first fixing frame 33 to move leftwards on the supporting frame 31, at this time, the rotating saw blade 355 can complete the sawing head work of the wood, the sawn wood can fall off from between the first conveying device 1 and the second conveying device 2, so that the front end of the wood is kept neat, after the cutting is completed, the first cylinder 34 can be shortened, the first fixing frame 33 can move rightwards on the supporting frame 31 and recover to the original position, meanwhile, the clasping mechanism 5 on the first conveying device 1 can also recover to the original position, then the first conveying device 1 can continue to operate under the control of the PLC control system, when the wood continues to move forwards to the guiding mechanism 6 on the second conveying device 2, because the guiding mechanism 6 on the second conveying device 2 has the same structure and working principle as the guiding mechanism 6 on the first conveying device 1, similarly under the cooperation of the PLC controller 10 and the first photoelectric sensor 12 on the second conveying device 2, the guiding mechanism 6 on the second conveying device 2 can be controlled to complete the guiding function on the wood, so that the wood can stably move on the second conveying device 2, meanwhile, the PLC 10 can control the fourth cylinder 82 to extend, the blocking piece 84 can be driven to correspondingly rotate by rotating the connecting rod 83 until the blocking piece 84 is positioned right ahead of the movement of the wood, when the third photoelectric sensor 14 senses the wood, the PLC 10 can simultaneously control the first conveying device 1 and the second conveying device 2 to stop running, at the moment, the blocking piece 84 can effectively block the wood from continuing to move forwards under the action of inertia, then the PLC 10 can control the clasping mechanism 5 on the second conveying device 2 to work, and as the clasping mechanism 5 on the second conveying device 2 is the same as the clasping mechanism 5 on the first conveying device 1 in structure and working principle, the fixing work of the wood can be completed in the same way, meanwhile, the fourth cylinder 82 is shortened under the control of the PLC controller 10 and drives the blocking piece 84 to return to the original position, at this time, the pressure switch 11 on the second conveying device 2 can determine whether the holding degree of the holding mechanism 5 to the timber meets the requirement of safe operation by detecting the air pressure value in the second cylinder 52 connected with the pressure switch, until the holding force of the holding mechanism 5 to the timber reaches the safe standard, under the control of the PLC controller 10, the cutting device 3 can be controlled to complete the fixed-length cutting of the timber, after the cutting is completed, the cutting device 3 and the holding mechanism 5 on the second conveying device 2 also return to the original position, then the first conveying device 1 and the second conveying device 2 can continue to operate under the control of the PLC controller 10 and continue to complete the cutting of the timber according to the aforementioned working principle, and when the remaining length is short, the timber falls from between the first conveying device 1 and the second conveying device 2 or continues to be conveyed by the second conveying device 2, in the process of cutting the timber, when the first photoelectric sensors 12 on the first conveying device 1 and the second conveying device 2 cannot sense the existence of the timber, the guide mechanism 6 can automatically return to the original position under the control of the PLC 10.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a timber fixed length dissection device, includes first conveyor (1), second conveyor (2), dissection device (3) and PLC control system, its characterized in that: the first conveying device (1) and the second conveying device (2) comprise a rack (41), a conveying mechanism (42) arranged on the rack (41) and a driving mechanism (43) used for driving the conveying mechanism (42), the left side and the right side of each rack (41) are respectively provided with a clasping mechanism (5), the second conveying device (2) is provided with a fixed-length blocking mechanism (8), and the segmenting device (3) is arranged between the first conveying device (1) and the second conveying device (2).

2. A timber length fixing and cutting device according to claim 1, wherein: cutting device (3) are including support frame (31), guide rail (32) of two parallels of fixedly connected with on support frame (31), support frame (31) have first mount (33) through two guide rail (32) sliding connection, fixedly connected with cutting mechanism on first mount (33), still are provided with first cylinder (34) on support frame (31), the outer end and support frame (31) fixed connection of first cylinder (34), the inner and first mount (33) fixed connection of first cylinder (34).

3. A timber length fixing and cutting device according to claim 2, wherein: the cutting mechanism comprises a motor (351), a driving wheel (352), a driven wheel (353), a rotating shaft (354) and a saw blade (355), wherein the motor (351) is fixedly connected to the upper portion of the first fixing frame (33), an output shaft of the motor (351) is fixedly connected with the driving wheel (352), the driving wheel (352) is in transmission connection with the driven wheel (353) through a conveying belt (356), the driven wheel (353) is fixedly connected with one end of the rotating shaft (354), the saw blade (355) is fixedly connected with the other end of the rotating shaft (354), at least two first bearings (357) are arranged on the rotating shaft (354) in a penetrating mode, and each first bearing (357) is fixedly connected to the first fixing frame (33) through a bearing seat (358).

4. A timber length fixing and cutting device according to claim 1, wherein: every enclasping mechanism (5) all includes second mount (51), second cylinder (52) and enclasping pole (53), second mount (51) and frame (41) fixed connection, the outer end and the second mount (51) of second cylinder (52) are articulated, the inner of second cylinder (52) with hug pole (53) articulated, the bottom and the second mount (51) swing joint of hugging pole (53).

5. A timber length fixing and cutting device according to claim 4, wherein: the inner side surface of each holding rod (53) is provided with a plurality of pointed bulges (54).

6. A timber length fixing and cutting device according to claim 1, wherein: all be provided with guide mechanism (6) that are used for supplementary mechanism (5) of holding tightly to hold the work of holding tightly on every frame (41), every guide mechanism (6) all includes third mount (61), third cylinder (62), guide bar (63) and direction wheelset, third mount (61) and frame (41) fixed connection, the outer end and third mount (61) of third cylinder (62) are articulated, the inner and guide bar (63) of third cylinder (62) are articulated, the bottom and the third mount (61) swing joint of guide bar (63), fixedly connected with buffer board (66) on guide bar (63), the direction wheelset is including wearing to establish second bearing (64) and a plurality of gear piece (65) of fixed connection on second bearing (64) of connection in guide bar (63) top department.

7. A timber length fixing and cutting device according to claim 1, wherein: a plurality of supporting assemblies are fixedly connected to the conveying mechanisms (42) of the first conveying device (1) and the second conveying device (2), and each supporting assembly comprises two triangular plates (7) which are arranged oppositely.

8. A timber length fixing and cutting device according to claim 1, wherein: fixed length stops mechanism (8) and includes fourth mount (81), fourth cylinder (82), connecting rod (83) and blocks piece (84), fourth mount (81) fixed connection is in frame (41), the outer end and fourth mount (81) of fourth cylinder (82) are articulated, the inner of fourth cylinder (82) is articulated with connecting rod (83), the bottom and the fourth mount swing joint of connecting rod (83), block the top of piece (84) fixed connection at connecting rod (83).

9. A timber length fixing and cutting device according to claim 1, wherein: the left side and the right side of one end, close to the cutting device (3), of the second conveying device (2) are provided with inclined limiting plates (9).

10. A timber length fixing and cutting device according to any one of claims 1 to 9, wherein: the PLC control system comprises a PLC controller (10) arranged at the first conveying device (1) or the second conveying device (2), a pressure switch (11) arranged at each second air cylinder (52), a first photoelectric sensor (12) arranged at the corresponding position of each guide mechanism (6), a second photoelectric sensor (13) arranged at the tail end of the first conveying device (1), and a third photoelectric sensor (14) arranged at the fixed-length blocking mechanism (8), the signal output ends of the pressure switch (11), the first photoelectric sensor (12), the second photoelectric sensor (13) and the third photoelectric sensor (14) are all connected with the signal input end of the PLC (10), and the signal output end of the PLC (10) is respectively connected with the signal input ends of the first cylinder (34), the second cylinder (52), the third cylinder (62) and the fourth cylinder (82).

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