Tool conveying device and thermal shrinkage equipment

Abstract

The invention discloses a tool conveying device and thermal shrinkage equipment. The tool conveying device comprises a support; the belt wheels are rotationally mounted on the bracket; an endless belt connected between the pair of pulleys; and a plurality of holding tools connected to the endless belt and spaced apart from each other. The holding tool comprises an extension part which is suitable for being clamped between a pair of conveying belts of the thermal shrinkage machine, so that the holding tool and the annular belt can be driven by the pair of conveying belts to circularly move between a feeding position and a discharging position of the thermal shrinkage machine along an annular path; and the joint part is arranged on the end part of the extension part and is suitable for being jointed with a connecting end at one end of the heat-shrinkable tube wire harness product. According to the invention, the holding tool can automatically return to the feeding position from the discharging position of the thermal shrinkage machine, so that time and labor are saved. The thermal shrinkage equipment disclosed by the invention not only can be used for processing a thermal shrinkage pipe wire harness product with two wire harness ends, but also can be used for processing a thermal shrinkage pipe wire harness product with a single wire harness end, so that the application range is expanded.

Description

Technical Field

[0001] The invention relates to a tool conveying device and a heat shrinking device comprising the tool conveying device. Background Art

[0002] In the prior art, heat shrink machines used to heat heat-shrink tubing harness products typically include a housing and two pairs of conveyor belts. These products typically include a wiring harness and heat-shrink tubing that shrinks onto the harness, with the harness extending from each end. The harness at one end of the heat-shrink tubing harness is clamped between the two conveyor belts, while the harness at the other end is clamped between the two conveyor belts. This allows the two pairs of conveyor belts to transport the harness into a heating chamber within the housing, where the heat-shrink tubing is heated and subsequently shrinks onto the harness.

[0003] However, some heat shrink tubing and wiring harness products have a connector crimped onto one end, making it difficult to clamp the end of the tubing and wiring harness between the pair of conveyor belts. In these cases, an external retaining tool is required to hold and secure the end of the tubing and wiring harness until it passes through the heat shrink machine's heating chamber. Ultimately, the retaining tool falls into the product recovery bin along with the tubing and wiring harness, mixing with the tubing and wiring harness. This requires the operator to frequently move to the rear of the heat shrink machine to locate the lost retaining tool and bring it back to the feed position at the front of the machine, which is extremely time-consuming and laborious. Summary of the Invention

[0004] The purpose of the present invention is to solve at least one aspect of the above-mentioned problems and defects in the prior art.

[0005] According to one aspect of the present invention, a tool conveying device is provided. The tool conveying device includes: a bracket; a pair of pulleys rotatably mounted on the bracket; an endless belt connected between the pair of pulleys; and a plurality of holding tools connected to the endless belt and spaced apart from each other. The holding tool includes: an extension portion adapted to be clamped between a pair of conveyor belts of a heat shrink machine, so that the holding tool and the endless belt can be driven by the pair of conveyor belts to circulate along an annular path between a feeding position and a unloading position of the heat shrink machine; and a coupling portion provided on an end portion of the extension portion and adapted to engage with a connecting end of one end of a heat shrink tubing harness product, for holding the connecting end of the heat shrink tubing harness product.

[0006] According to an exemplary embodiment of the present invention, the annular path includes a first straight path, and the holding tool is suitable for moving from a feeding position of the heat shrink machine to a unloading position of the heat shrink machine along the first straight path under the drive of a pair of conveyor belts of the heat shrink machine; when the holding tool is moved to the first straight path, the extension portion of the holding tool is in a horizontal position parallel to the horizontal direction, so that the extension portion can be clamped between the pair of conveyor belts of the heat shrink machine.

[0007] According to another exemplary embodiment of the present invention, the annular path further comprises: a second straight path parallel to and opposite to the first straight path; a first semicircular path located between one end of the first straight path and the second straight path; and a second semicircular path located between the other ends of the first straight path and the second straight path. The holding tool is adapted to be driven by a pair of conveyor belts of the heat shrink machine and to move along the first semicircular path, the second straight path, and the second semicircular path from a discharge position of the heat shrink machine to a feed position of the heat shrink machine.

[0008] According to another exemplary embodiment of the present invention, the rotation axis of the pulley is inclined at a predetermined angle relative to a horizontal plane, and an angle between the extending direction of the extending portion of the holding tool and the rotation axis of the pulley is equal to the predetermined angle.

[0009] According to another exemplary embodiment of the present invention, the predetermined angle is greater than 30 degrees and less than 60 degrees, so that when the holding tool is moved to the second straight path, the angle between the extension direction of the extension part of the holding tool and the vertical direction is no greater than 30 degrees.

[0010] According to another exemplary embodiment of the present invention, the predetermined angle is equal to 45 degrees, so that when the holding tool is moved to the second linear path, the extension of the holding tool is in a vertical orientation parallel to the vertical direction.

[0011] According to another exemplary embodiment of the present invention, the holding tool further includes a mounting block connected to the endless belt, and one end of the extension portion is connected to the mounting block.

[0012] According to another exemplary embodiment of the present invention, the mounting block is detachably connected to the endless belt, so that the holding tool can be quickly replaced.

[0013] According to another exemplary embodiment of the present invention, the extension portion includes: a fixed rod, one end of which is connected to the mounting block; and a movable rod movably connected to the fixed rod, the movable rod being capable of moving relative to the fixed rod along the extension direction of the extension portion so that the extension length of the extension portion can be adjusted, and the movable rod is adapted to be clamped between a pair of conveyor belts of the heat shrink machine.

[0014] According to another exemplary embodiment of the present invention, the engaging portion includes a engaging pin fixed to the end of the extending portion, and the engaging pin is adapted to be inserted into a connecting hole on the connecting end of the heat shrink tubing harness product to hold the connecting end of the heat shrink tubing harness product.

[0015] According to another exemplary embodiment of the present invention, the tool transport device further includes: a pair of support shafts fixed to the bracket; and a pair of bearings mounted on the pair of support shafts, wherein the pair of pulleys are mounted on the pair of bearings so as to be able to freely rotate about the axes of the support shafts.

[0016] According to another exemplary embodiment of the present invention, the tool transport device further includes a housing, the bracket, the pulley and the endless belt are accommodated in the housing, the inner side of the housing is fixed to the bracket, and a gap is formed in the housing to allow the holding tool to extend.

[0017] According to another exemplary embodiment of the present invention, the tool conveying device further includes: a unloading tool fixed to the bracket, for separating the heat shrink tubing harness product from the holding tool after passing through the heating chamber of the heat shrink machine.

[0018] According to another exemplary embodiment of the present invention, the unloading tool includes a blocking rod, which is perpendicular to the axial direction of the heat shrinkable tube harness product passing through the heating chamber of the heat shrink machine to block the heat shrinkable tube harness product at a predetermined unloading position and disengage it from the holding tool.

[0019] According to another aspect of the present invention, a heat shrink device is provided. The heat shrink device includes a heat shrink machine having a housing and two pairs of conveyor belts for conveying heat shrink tubing and wiring harness products into a heating chamber within the housing; and the aforementioned tool conveying device mounted on one side of the heat shrink machine housing. The heat shrink tubing and wiring harness products have a connection end at one end and a wiring harness end at the other end. An extension of the holding tool that engages with the connection end of the heat shrink tubing and wiring harness product is clamped between the pair of conveyor belts of the heat shrink machine, and the wiring harness end of the heat shrink tubing and wiring harness product is clamped between the other pair of conveyor belts of the heat shrink machine.

[0020] According to an exemplary embodiment of the present invention, the shell of the heat shrink machine has two opposite sides in its transverse direction, and the tool conveying device is fixed to one side of the shell of the heat shrink machine; the heating chamber of the heat shrink machine has an inlet and an outlet opposite to each other in the longitudinal direction of the shell of the heat shrink machine, and the unloading tool of the tool conveying device is located at the outlet of the heating chamber.

[0021] According to another exemplary embodiment of the present invention, the transverse and longitudinal directions of the housing of the heat shrink machine define a horizontal plane, and the rotation axis of the pulley of the tool conveying device is inclined at a predetermined angle relative to the horizontal plane.

[0022] According to another exemplary embodiment of the present invention, when the holding tool moves between the entrance and exit of the heating chamber of the heat shrink machine, the extension direction of the extension portion of the holding tool is parallel to the transverse direction of the shell of the heat shrink machine, so that the extension portion can be clamped between a pair of conveyor belts of the heat shrink machine.

[0023] According to another exemplary embodiment of the present invention, the heat shrink machine also includes a product recovery box, which is located below the outlet of the heating chamber; and after passing through the heating chamber, the heat shrink tubing harness product is separated from the holding tool and falls into the product recovery box under the obstruction of the unloading tool.

[0024] In the aforementioned exemplary embodiments of the present invention, the tool transport device is capable of transporting the holding tool along a circular path, allowing the holding tool to automatically return from the heat shrink machine's unloading position to the heat shrink machine's feeding position, saving time and effort. Furthermore, a heat shrink machine equipped with this tool transport device can handle both heat shrink tubing and wiring harness products with two wire ends and those with a single wire end, expanding the heat shrink machine's application range and enhancing its market competitiveness.

[0025] Other objects and advantages of the present invention will become apparent from the following description of the present invention with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A perspective schematic diagram showing a tool transport device according to an exemplary embodiment of the present invention;

[0027] Figure 2 A perspective schematic diagram showing a tool transport device according to an exemplary embodiment of the present invention as viewed from one side, with the housing removed;

[0028] Figure 3A perspective schematic diagram showing a tool transport device according to an exemplary embodiment of the present invention as viewed from another side, with the housing removed;

[0029] Figure 4 A schematic diagram showing a tool conveying device holding a heat shrink tubing harness product according to an exemplary embodiment of the present invention;

[0030] Figure 5 A perspective schematic diagram showing a holding tool according to an exemplary embodiment of the present invention;

[0031] Figure 6 A perspective schematic diagram showing a heat shrinking machine according to an exemplary embodiment of the present invention;

[0032] Figure 7 A perspective schematic diagram showing a heat shrink machine according to an exemplary embodiment of the present invention, wherein an upper housing of the heat shrink machine is removed;

[0033] Figure 8 A schematic diagram showing a holding tool engaged with a connection end of a heat shrink tubing harness product according to an exemplary embodiment of the present invention being clamped between a pair of conveyor belts of a heat shrink machine. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be further described in detail below through examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as limiting the present invention.

[0035] In addition, in the following detailed description, for ease of explanation, numerous specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments can be practiced without these specific details. In other cases, well-known structures and devices are shown in diagrammatic form to simplify the accompanying drawings.

[0036] According to an overall technical concept of the present invention, a tool conveying device is provided. The tool conveying device includes: a bracket; a pair of pulleys rotatably mounted on the bracket; an endless belt connected between the pair of pulleys; and a plurality of holding tools connected to the endless belt and spaced apart from each other. The holding tool includes: an extension portion adapted to be clamped between a pair of conveyor belts of a heat shrink machine, so that the holding tool and the endless belt can be driven by the pair of conveyor belts to circulate along an annular path between a feeding position and a unloading position of the heat shrink machine; and a coupling portion provided on an end portion of the extension portion and adapted to engage with a connecting end at one end of a heat shrink tubing harness product, for holding the connecting end of the heat shrink tubing harness product.

[0037] According to another general technical concept of the present invention, a heat shrink device is provided. The heat shrink device includes a heat shrink machine having a housing and two pairs of conveyor belts for conveying heat shrink tubing and wiring harness products into a heating chamber within the housing; and the aforementioned tool conveying device mounted on one side of the heat shrink machine housing. The heat shrink tubing and wiring harness products have a connection end at one end and a wiring harness end at the other end. An extension of the holding tool that engages with the connection end of the heat shrink tubing and wiring harness product is clamped between the pair of conveyor belts of the heat shrink machine, and the wiring harness end of the heat shrink tubing and wiring harness product is clamped between the other pair of conveyor belts of the heat shrink machine.

[0038] Figure 1 A schematic perspective view showing a tool transport device 1 according to an exemplary embodiment of the present invention; Figure 2 A schematic perspective view of a tool transport device 1 according to an exemplary embodiment of the present invention is shown, viewed from one side, with the housing 16 removed; Figure 3 A schematic perspective view of the tool transport device 1 according to an exemplary embodiment of the present invention, viewed from another side, with the housing 16 removed; Figure 4 A schematic diagram showing a tool conveying device 1 holding a heat shrink tubing harness product 3 according to an exemplary embodiment of the present invention; Figure 5 A perspective schematic diagram showing a holding tool 13 according to an exemplary embodiment of the present invention; Figure 6 A perspective schematic diagram showing a heat shrinking machine 2 according to an exemplary embodiment of the present invention; Figure 7 A perspective schematic diagram showing a heat shrink machine 2 according to an exemplary embodiment of the present invention, wherein the upper housing of the heat shrink machine 2 is removed; Figure 8 A schematic diagram showing a holding tool 13 engaged with a connection end 31 of a heat shrink tubing harness product 3 according to an exemplary embodiment of the present invention being clamped between a pair of conveyor belts 21 of a heat shrink machine 2 .

[0039] like Figures 1 to 8 As shown, in an exemplary embodiment of the present invention, a tool transport device 1 is disclosed. The tool transport device 1 includes a support 10, a pair of pulleys 11, an endless belt 12, and a plurality of holding tools 13. The pair of pulleys 11 are rotatably mounted on the support 10. The endless belt 12 is connected between the pair of pulleys 11. A plurality of holding tools 13 are connected to the endless belt 12 and are spaced apart from each other.

[0040] like Figures 1 to 8As shown, in the illustrated embodiment, the holding tool 13 includes an extension portion 130 and an engagement portion 131. The extension portion 130 of the holding tool 13 is adapted to be clamped between a pair of conveyor belts 21 of the heat shrink machine 2, allowing the holding tool 13 and the endless belt 12 to cyclically move along an endless path P between a feeding position and a discharge position of the heat shrink machine 2, driven by the pair of conveyor belts 21. The engagement portion 131 of the holding tool 13 is provided at the end of the extension portion 130 and is adapted to engage with a connection terminal 31 (e.g., a crimping terminal) at one end of the heat shrink tubing harness product 3, thereby retaining the connection terminal 31 of the heat shrink tubing harness product 3.

[0041] like Figures 1 to 8 As shown, in the illustrated embodiment, the loop path P includes a first linear path P1, and the holding tool 13 is adapted to be moved along the first linear path P1 from a feeding position of the heat shrink machine 2 to a discharging position of the heat shrink machine 2 under the drive of the pair of conveyor belts 21 of the heat shrink machine 2. When the holding tool 13 is moved to the first linear path P1, the extension 130 of the holding tool 13 is in a horizontal orientation parallel to the horizontal direction (so as to be parallel to the transverse direction of the heat shrink machine 2), so that the extension 130 can be clamped between the pair of conveyor belts 21 of the heat shrink machine 2.

[0042] like Figures 1 to 8 As shown, in the illustrated embodiment, the aforementioned annular path P further includes: a second straight path P2, a first semicircular path P3, and a second semicircular path P4. The second straight path P2 is parallel to and opposite to the first straight path P1. The first semicircular path P3 is located between one end of the first straight path P1 and the second straight path P2. The second semicircular path P4 is located between the other ends of the first straight path P1 and the second straight path P2. The holding tool 13 is adapted to be moved from the unloading position of the heat shrink machine 2 to the feeding position of the heat shrink machine 2 along the first semicircular path P3, the second straight path P2, and the second semicircular path P4 under the drive of a pair of conveyor belts 21 of the heat shrink machine 2. In this way, the holding tool 13 can automatically return to the feeding position, saving time and effort.

[0043] like Figures 1 to 8 As shown, in the illustrated embodiment, the rotation axis of the pulley 11 is inclined at a predetermined angle relative to the horizontal plane, and the angle between the extension direction of the extension portion 130 of the holding tool 13 and the rotation axis of the pulley 11 is equal to the predetermined angle.

[0044] like Figures 1 to 8 As shown, in the illustrated embodiment, the predetermined angle is greater than 30 degrees and less than 60 degrees, so that when the holding tool 13 is moved to the second linear path P2, the angle between the extension direction of the extension portion 130 of the holding tool 13 and the vertical direction is no greater than 30 degrees. In this way, the extension portion 130 of the holding tool 13 can be prevented from interfering with the housing 20 of the heat shrink machine 2 when moving along the second linear path P2.

[0045] like Figures 1 to 8 As shown, in the illustrated embodiment, the predetermined angle is equal to 45 degrees, so that when the holding tool 13 is moved to the second linear path P2, the extension 130 of the holding tool 13 is in a vertical orientation parallel to the vertical direction.

[0046] like Figures 1 to 8 As shown, in the illustrated embodiment, the holding tool 13 further includes a mounting block 132 , which is connected to the endless belt 12 , and one end of the extension 130 is connected to the mounting block 132 .

[0047] like Figures 1 to 8 As shown, in the illustrated embodiment, the mounting block 132 is detachably connected to the endless belt 12 so that the holding tool 13 can be quickly replaced. For example, the mounting block 132 can be fastened to the endless belt 12 by bolts.

[0048] like Figures 1 to 8 As shown, in the illustrated embodiment, the extension portion 130 includes a fixed rod 13a and a movable rod 13b. One end of the fixed rod 13a is connected to a mounting block 132. The movable rod 13b is movably connected to the fixed rod 13a. The movable rod 13b is movable relative to the fixed rod 13a along the extension direction of the extension portion 130, thereby adjusting the extension length of the extension portion 130. The movable rod 13b is adapted to be clamped between a pair of conveyor belts 21 of the heat shrink machine 2.

[0049] like Figures 1 to 8 As shown, in the illustrated embodiment, the coupling portion 131 includes a coupling pin fixed to the end of the extension portion 130, and the coupling pin is suitable for being inserted into the connecting hole 30 on the connecting end 31 of the heat shrink tube wiring harness product 3 to hold the connecting end 31 of the heat shrink tube wiring harness product 3.

[0050] like Figures 1 to 8 As shown, in the illustrated embodiment, the tool transport device 1 further includes a pair of support shafts 17 and a pair of bearings 18. The pair of support shafts 17 are fixed to the bracket 10. The pair of bearings 18 are respectively mounted on the pair of support shafts 17. The pair of pulleys 11 are respectively mounted on the pair of bearings 18 so that the pulleys 11 can freely rotate about the axes of the support shafts 17.

[0051] like Figures 1 to 8 As shown, in the illustrated embodiment, the tool transport device 1 further includes a housing 16. The bracket 10, the pulley 11, and the endless belt 12 are accommodated in the housing 16. The inner side of the housing 16 is fixed to the bracket 10, and a slit is formed on the housing 16 to allow the holding tool 13 to extend.

[0052] like Figures 1 to 8As shown, in the illustrated embodiment, the tool conveying device 1 further includes a unloading tool 15 fixed to the bracket 10 for separating the heat shrink tubing harness product 3 from the holding tool 13 after passing through the heating chamber 23 of the heat shrink machine 2 .

[0053] like Figures 1 to 8 As shown, in the illustrated embodiment, the unloading tool 15 includes a blocking rod 150, which is perpendicular to the axial direction of the heat shrinkable tube harness product 3 passing through the heating chamber 23 of the heat shrink machine 2, so as to block the heat shrinkable tube harness product 3 at a predetermined unloading position and disengage it from the holding tool 13.

[0054] like Figures 1 to 8 As shown, in another exemplary embodiment of the present invention, a heat shrink device is also disclosed. The heat shrink device includes: a heat shrink machine 2 and the aforementioned tool conveying device 1. The heat shrink machine 2 includes a housing 20 and two pairs of conveyor belts 21, 22 for conveying the heat shrink tubing harness product 3 into the heating chamber 23 in the housing 20. The tool conveying device 1 is mounted on one side of the housing 20 of the heat shrink machine 2. The heat shrink tubing harness product 3 has a connecting end 31 at one end thereof and a harness end 32 at the other end thereof. The extension 130 of the holding tool 13 that engages with the connecting end 31 of the heat shrink tubing harness product 3 is clamped between a pair of conveyor belts 21 of the heat shrink machine 2, and the harness end 32 of the heat shrink tubing harness product 3 is clamped between another pair of conveyor belts 22 of the heat shrink machine 2.

[0055] like Figures 1 to 8 As shown, in the illustrated embodiment, the housing 20 of the heat shrink machine 2 has two opposite sides in the transverse direction thereof, and the tool transport device 1 is fixed to one side of the housing 20 of the heat shrink machine 2. The heating chamber 23 of the heat shrink machine 2 has an inlet and an outlet that are opposite to each other in the longitudinal direction of the housing 20 of the heat shrink machine 2, and the unloading tool 15 of the tool transport device 1 is located at the outlet of the heating chamber 23.

[0056] like Figures 1 to 8 As shown, in the illustrated embodiment, the transverse and longitudinal directions of the housing 20 of the heat shrink machine 2 define a horizontal plane, and the rotation axis of the pulley 11 of the tool conveying device 1 is inclined at a predetermined angle relative to the horizontal plane.

[0057] like Figures 1 to 8 As shown, in the illustrated embodiment, when the holding tool 13 moves along the first straight path P1 between the entrance and the exit of the heating chamber 23 of the heat shrink machine 2, the extension direction of the extension portion 130 of the holding tool 13 is parallel to the transverse direction of the housing 20 of the heat shrink machine 2, so that the extension portion 130 can be clamped between a pair of conveyor belts 21 of the heat shrink machine 2.

[0058] like Figures 1 to 8As shown, in the illustrated embodiment, the heat shrink machine 2 further includes a product recovery box (not shown) located below the outlet of the heating chamber 23. After passing through the heating chamber 23, the heat shrink tubing harness product 3 is separated from the holding tool 13 by the unloading tool 15 and falls into the product recovery box. The holding tool 13 then returns to the feeding position of the heat shrink machine 2 along with the endless belt 12 from the unloading position of the heat shrink machine 2.

[0059] Those skilled in the art will understand that the embodiments described above are exemplary and can be improved by those skilled in the art. The structures described in various embodiments can be freely combined without causing any conflicts in structure or principle. These changes should fall within the scope of protection of the present invention.

[0060] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify the preferred embodiments of the present invention and should not be construed as limiting the present invention.

[0061] Although some embodiments of the general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.

[0062] It should be noted that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. In addition, any element reference in the claims should not be construed as limiting the scope of the invention.

Claims

1. A tool conveying device, characterized in that: include: Bracket (10); a pair of pulleys (11) rotatably mounted on the bracket (10); an endless belt (12) connected between the pair of pulleys (11); and a plurality of holding tools (13) connected to the endless belt (12) and spaced apart from each other, The holding tool (13) comprises: An extension portion (130) adapted to be clamped between a pair of conveyor belts (21) of a heat shrink machine (2), so that the holding tool (13) and the endless belt (12) can be driven by the pair of conveyor belts (21) to cyclically move along an endless path (P) between a feeding position and a discharge position of the heat shrink machine (2); and A joining portion (131) is provided on the end of the extension portion (130) and is adapted to be joined with a connecting end (31) at one end of the heat shrink tubing harness product (3) for holding the connecting end (31) of the heat shrink tubing harness product (3).

2. The tool conveying device according to claim 1, wherein: The annular path (P) includes a first straight path (P1), and the holding tool (13) is suitable for moving from a feeding position of the heat shrink machine (2) to a discharge position of the heat shrink machine (2) along the first straight path (P1) under the drive of a pair of conveyor belts (21) of the heat shrink machine (2); When the holding tool (13) is moved to the first straight path (P1), the extension portion (130) of the holding tool (13) is in a horizontal orientation parallel to the horizontal direction, so that the extension portion (130) can be clamped between a pair of conveyor belts (21) of the heat shrink machine (2).

3. The tool conveying device according to claim 1, wherein: The annular path (P) further comprises: a second straight path (P2) parallel to and opposite to the first straight path (P1); a first semicircular path (P3) located between one end of the first straight path (P1) and the second straight path (P2); and a second semicircular path (P4) located between the other end of the first straight path (P1) and the second straight path (P2), The holding tool (13) is suitable for moving from the unloading position of the heat shrink machine (2) to the feeding position of the heat shrink machine (2) along the first semicircular path (P3), the second straight path (P2) and the second semicircular path (P4) under the drive of a pair of conveyor belts (21) of the heat shrink machine (2).

4. The tool conveying device according to claim 3, characterized in that: The rotation axis of the pulley (11) is inclined at a predetermined angle relative to a horizontal plane, and the angle between the extension direction of the extension portion (130) of the holding tool (13) and the rotation axis of the pulley (11) is equal to the predetermined angle.

5. The tool transport device according to claim 4, characterized in that: The predetermined angle is greater than 30 degrees and less than 60 degrees, so that when the holding tool (13) is moved to the second straight path (P2), the angle between the extension direction of the extension part (130) of the holding tool (13) and the vertical direction is no greater than 30 degrees.

6. The tool transport device according to claim 4, wherein: The predetermined angle is equal to 45 degrees, so that when the holding tool (13) is moved to the second linear path (P2), the extension (130) of the holding tool (13) is in a vertical orientation parallel to the vertical direction.

7. The tool transport device according to claim 1, wherein: The holding tool (13) further includes a mounting block (132) connected to the endless belt (12), and one end of the extension portion (130) is connected to the mounting block (132).

8. The tool transport device according to claim 7, wherein: The mounting block (132) is detachably connected to the endless belt (12) so that the holding tool (13) can be quickly replaced.

9. The tool transport device according to claim 7, wherein: The extension portion (130) comprises: a fixing rod (13a) having one end connected to the mounting block (132); and A movable rod (13b) is movably connected to the fixed rod (13a), and the movable rod (13b) can move relative to the fixed rod (13a) along the extension direction of the extension portion (130), so that the extension length of the extension portion (130) can be adjusted, and the movable rod (13b) is suitable for being clamped between a pair of conveyor belts (21) of the heat shrink machine (2).

10. The tool transport device according to claim 7, wherein: The engaging portion (131) includes an engaging pin fixed to the end of the extending portion (130), and the engaging pin is suitable for being inserted into a connecting hole (30) on the connecting end (31) of the heat shrink tubing harness product (3) to retain the connecting end (31) of the heat shrink tubing harness product (3).

11. The tool transport device according to claim 1, wherein: Also includes: a pair of support shafts (17) fixed to the bracket (10); and A pair of bearings (18) are respectively mounted on the pair of support shafts (17). The pair of pulleys (11) are respectively mounted on the pair of bearings (18) so that the pulleys (11) can freely rotate around the axis of the support shaft (17).

12. The tool transport device according to claim 1, wherein: Also includes: a housing (16), wherein the bracket (10), the pulley (11) and the endless belt (12) are accommodated in the housing (16), The inner side of the housing (16) is fixed to the bracket (10), and a slit is formed on the housing (16) to allow the holding tool (13) to protrude.

13. The tool transport device according to any one of claims 1 to 12, characterized in that: Also includes: A discharging tool (15) is fixed to the bracket (10) and is used to separate the heat shrink tubing harness product (3) from the holding tool (13) after the heat shrink tubing harness product (3) passes through the heating chamber (23) of the heat shrink machine (2).

14. The tool transport device according to claim 13, wherein: The unloading tool (15) includes a blocking rod (150) which is perpendicular to the axial direction of the heat shrink tubing harness product (3) passing through the heating chamber (23) of the heat shrink machine (2) so as to block the heat shrink tubing harness product (3) at a predetermined unloading position and disengage it from the holding tool (13).

15. A heat shrink device, characterized in that: include: A heat shrink machine (2) comprises a housing (20) and two pairs of conveyor belts (21, 22) for conveying heat shrink tubing harness products (3) into a heating chamber (23) within the housing (20); and The tool transport device (1) according to any one of claims 1 to 14 is mounted on one side of the housing (20) of the heat shrink machine (2), The heat shrink tubing harness product (3) has a connection end (31) at one end thereof and a harness end (32) at the other end thereof; an extension portion (130) of the holding tool (13) engaged with the connection end (31) of the heat shrink tubing harness product (3) is clamped between a pair of conveyor belts (21) of the heat shrink machine (2); and the harness end (32) of the heat shrink tubing harness product (3) is clamped between another pair of conveyor belts (22) of the heat shrink machine (2).

16. The heat shrink device according to claim 15, characterized in that: The housing (20) of the heat shrink machine (2) has two opposite sides in its transverse direction, and the tool conveying device (1) is fixed to one side of the housing (20) of the heat shrink machine (2); The heating chamber (23) of the heat shrink machine (2) has an inlet and an outlet that are opposite to each other in the longitudinal direction of the housing (20) of the heat shrink machine (2), and the unloading tool (15) of the tool conveying device (1) is located at the outlet of the heating chamber (23).

17. The heat shrink device according to claim 16, characterized in that: The shell (20) of the heat shrink machine (2) defines a horizontal plane in its transverse and longitudinal directions, and the rotation axis of the pulley (11) of the tool conveying device (1) is inclined at a predetermined angle relative to the horizontal plane.

18. The heat shrink device according to claim 16, characterized in that: When the holding tool (13) moves between the entrance and exit of the heating chamber (23) of the heat shrink machine (2), the extension direction of the extension portion (130) of the holding tool (13) is parallel to the transverse direction of the housing (20) of the heat shrink machine (2), so that the extension portion (130) can be clamped between a pair of conveyor belts (21) of the heat shrink machine (2).

19. The heat shrink device according to claim 16, characterized in that: The heat shrink machine (2) further includes a product recovery box, which is located below the outlet of the heating chamber (23); and After passing through the heating chamber (23), the heat shrink tubing harness product (3) is separated from the holding tool (13) and falls into the product recovery box under the obstruction of the unloading tool (15).

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