Oven for packaging tape secondary stretching
Patent Information
- Application Number
- CN202620003465.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-05
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2036-01-05
AI Technical Summary
这种结构导致在实际生产中，当处理不同厚度规格的打包带时，装置无法动态调整加热丝与带材表面的距离，固定间距使带材边缘与中心区域的热渗透深度不一致，易产生分子链排列不均的"夹生"现象，最后动作设备适用性受限，为此，我们提出用于打包带二次拉伸的烘箱
[0015]1.本实用新型通过加热丝调节机构可完成当需要对不同厚度的打包带进行加热丝本体之间的间距进行调整时，此时可通过外设电源对双线电动推杆进行直接供电以及直接控制动作，此时的双向电动推杆伸缩杆端部直接带动移动杆进行移动动作，两个移动杆进行相互靠近动作，此时的移动杆直接带动L形移动板在滑槽内进行滑动动作，此时的L形移动板直接带动第一齿条进行移动动作，此时的第一齿条带动中间齿轮进行转动进而带动随动轴进行转动动作，此时的随动轴直接带动第二齿条进行与第一齿条相反方向的运动，此时的每个第一齿条以及第二齿条直接带动接触条、加热板以及加热丝本体进行移动动作，同侧两个加热板之间的间距被调整，因此同侧的加热丝本体之间的间距被调整，可对同组对称设置的加热丝本体进行间距调节作用，实现了对不同厚度的打包带进行加热作用，提高了装置的适用性以及可对多条打包带进行同时加热进而进行拉伸动作，提高了同一批次的打包带的拉伸效率。
Smart Images
Figure CN224915157U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of packing strap production technology, specifically to an oven for secondary stretching of packing straps. Background Technology
[0002] Strapping straps, also known as binding straps, can be categorized by raw materials such as polyethylene, cold-rolled steel strip, and nylon. They are produced through extrusion and unidirectional stretching, followed by heat treatment and bluing. They are commonly used for sealing and binding corrugated cardboard boxes, hot-rolled steel coils, and cold-rolled steel coils. They can also be used to bind glass, pipes, raw materials, and fruits. Strapping strap stretching equipment refers to equipment used during the strapping strapping processing to improve its tensile strength and toughness. Strapping strapping requires a stretching process to increase its strength during production, but traditional single-stretching processes can easily lead to uneven molecular chain arrangement, affecting the product's toughness. In existing technologies, secondary stretching requires preheating and softening the strapping strapping in an independent oven before stretching.
[0003] In existing technologies, heating devices for strapping generally employ a fixed heating wire layout, with a rigid, non-adjustable spacing between the heating wire and the strapping material. This structure results in the inability to dynamically adjust the distance between the heating wire and the surface of the strapping material when processing strapping of different thicknesses in actual production. The fixed spacing leads to inconsistent heat penetration depth between the edge and center areas of the strapping material, easily causing an uneven molecular chain arrangement and a "half-baked" phenomenon. Ultimately, this limits the applicability of the equipment. Therefore, we propose an oven for the secondary stretching of strapping. Summary of the Invention
[0004] The purpose of this invention is to provide an oven for secondary stretching of packing straps, so as to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: an oven for secondary stretching of packing straps, comprising an oven body, an oven cavity at the inner end of the oven body, horizontal grooves on the upper parts of both sides of the oven body, each horizontal groove being connected to a vertical groove symmetrically arranged on both sides of the oven body, the horizontal grooves and the vertical grooves being connected to the oven cavity, a sliding groove and a guide groove at the middle of the upper end of the oven body, the guide groove being located on the right side of the sliding groove, a multiple packing strap stretching mechanism and a heating wire adjustment mechanism being provided on the oven body, the heating wire adjustment mechanism including a heating wire body, the heating wire adjustment mechanism being used to adjust the distance of the heating wire body, the multiple packing strap stretching mechanism including a packing strap clamping assembly, the packing strap clamping assembly being used to center and limit the clamping of the packing straps, and the multiple packing strap stretching mechanism being used to simultaneously stretch multiple packing straps on both sides.
[0006] Preferably, the heating wire adjustment mechanism includes a bidirectional electric push rod. The lower end of the bidirectional electric push rod is fixedly installed on the upper end of the oven body. The bidirectional electric push rod is located on the side of the slide groove away from the guide groove. Movable rods are fixedly installed at the ends of the front and rear telescopic rods of the bidirectional electric push rod. An L-shaped movable plate is fixedly installed at the ends of the two movable rods that are far apart from each other. A first rack is fixedly installed at the lower end of each L-shaped movable plate. An intermediate gear is meshed with the right side of the first rack. A second rack is meshed with the right side of the intermediate gear. A contact strip is fixedly installed in the middle of the ends of the first rack and the second rack that are far apart from each other on the same side. A heating plate is fixedly installed at the outer end of each contact strip. Multiple heating wire bodies that are vertically distributed are fixedly installed at the ends of the two heating plates that are close to each other on the same side.
[0007] Preferably, the multi-strap stretching mechanism includes a stepper motor. The stepper motor is fixedly installed at the lower right side of the oven body, near the oven body. A rotating rod is fixedly installed at the output end of the stepper motor. Two symmetrically arranged moving strips are threaded to the outer end of the rotating rod. The lower end of the moving strips is slidably connected to the lower inner wall of the oven cavity. Two symmetrically arranged L-shaped frames are fixedly installed at the ends of the two moving strips that are away from each other. A moving frame is fixedly installed on the upper end of the two L-shaped frames on the same side. Two symmetrically arranged placement slots are opened on the surface of the moving frame. Strap clamping components are provided on the inner walls of the front and rear sections of each placement slot.
[0008] Preferably, the packing strap clamping assembly includes a one-way electric push rod, each of which is fixedly installed on the inner wall of the placement slot at one end, and a clamping plate is fixedly installed at the telescopic end of each of the one-way electric push rods. The outer wall of the clamping plate is slidably connected to the inner wall of the placement slot, and a plurality of evenly distributed anti-slip strips are fixedly installed on the inner end of the clamping plate.
[0009] Preferably, the outer wall of the L-shaped movable plate is slidably connected to the inner wall of the groove, and the lower end of the L-shaped movable plate passes through the lower end of the groove.
[0010] Preferably, a follower shaft is fixedly installed at the middle of the upper end of the intermediate gear, and the upper end of the follower shaft is rotatably connected to the inner wall of the top of the oven body through a bearing.
[0011] Preferably, a guide post is fixedly installed on the upper end of each of the second racks, the outer wall of each guide post is slidably connected to the inner wall of the guide groove, and the upper end of each guide post passes through the upper end of the oven body.
[0012] Preferably, the outer end of the rotating rod has two threaded grooves with opposite directions of rotation, and the end of the rotating rod away from the stepper motor is rotatably connected to the inner left wall of the oven body through a bearing.
[0013] Preferably, the outer wall of the L-shaped frame is slidably connected to the inner wall of the vertical groove, and the movable frame is set corresponding to the horizontal groove.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] 1. This utility model, through a heating wire adjustment mechanism, enables the adjustment of the spacing between heating wire bodies of packing straps of different thicknesses. An external power supply directly powers and controls the dual-wire electric push rod. The telescopic end of the bidirectional electric push rod directly drives the moving rod to move, bringing the two moving rods closer together. The moving rod then drives the L-shaped moving plate to slide within the groove. The L-shaped moving plate then drives the first rack to move, which in turn drives the intermediate gear to rotate, thereby rotating the follower shaft. The follower shaft then drives the second rack to move in the opposite direction to the first rack. Each of the first and second racks directly drives the contact strip, heating plate, and heating wire body to move, adjusting the spacing between the two heating plates on the same side. This, in turn, adjusts the spacing between the heating wire bodies on the same side, allowing for the adjustment of the spacing between symmetrically arranged heating wire bodies. This achieves heating of packing straps of different thicknesses, improving the applicability of the device and enabling simultaneous heating and stretching of multiple packing straps, thus increasing the stretching efficiency of the same batch of packing straps.
[0016] 2. This utility model, through a multi-strap stretching mechanism, can simultaneously power and control multiple unidirectional electric push rods via an external power supply and controller. The telescopic ends of the unidirectional electric push rods directly drive the clamping plates and anti-slip strips to move. The anti-slip strips on the clamping plates in the same group move closer together. Once the two sets of symmetrically arranged anti-slip strips clamp the ends of the strapping bands, the external power supply and controller can then power and control the stepper motor. The output of the stepper motor directly drives the rotating rod to rotate. The rotating rod then drives two symmetrically arranged moving bars to move away from each other. Each moving bar directly drives two symmetrically arranged L-shaped frames to move. The two L-shaped frames directly drive the moving frame and multiple sets of strapping band clamping components to move, thus completing the stretching action of multiple strapping bands. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a schematic diagram of the main structure of the oven body of this utility model;
[0019] Figure 3This is a schematic diagram of the heating wire adjustment mechanism of this utility model;
[0020] Figure 4 This is a schematic diagram of the multi-strap stretching mechanism of this utility model;
[0021] Figure 5 This is a schematic diagram of the packing strap clamping assembly of this utility model.
[0022] In the diagram: 1. Oven body; 2. Oven cavity; 3. Horizontal groove; 4. Vertical groove; 5. Sliding groove; 6. Guide groove; 7. Multi-strap stretching mechanism; 71. Stepper motor; 72. Rotating rod; 73. Moving bar; 74. L-shaped frame; 75. Moving frame; 76. Placement groove; 77. Strap clamping assembly; 771. One-way electric push rod; 772. Clamping plate; 773. Anti-slip strip; 8. Heating wire adjustment mechanism; 81. Two-way electric push rod; 82. Moving rod; 83. L-shaped moving plate; 84. First rack; 85. Intermediate gear; 86. Follower shaft; 87. Second rack; 88. Guide post; 89. Contact bar; 810. Heating plate; 811. Heating wire body. Detailed Implementation
[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0024] Please see Figure 1 - Figure 5 This utility model provides a technical solution: an oven for secondary stretching of packing straps, including an oven body 1, an oven cavity 2 opened at the inner end of the oven body 1, horizontal grooves 3 opened on the upper part of both sides of the oven body 1, each horizontal groove 3 is connected to a vertical groove 4 opened symmetrically on both sides of the oven body 1, the horizontal grooves 3 and the vertical grooves 4 are both connected to the oven cavity 2, a sliding groove 5 and a guide groove 6 are opened in the middle of the upper end of the oven body 1, the guide groove 6 is located on the right side of the sliding groove 5, the oven body 1 is provided with a multiple packing strap stretching mechanism 7 and a heating wire adjustment mechanism 8, the heating wire adjustment mechanism 8 includes a heating wire body 811, the heating wire adjustment mechanism 8 is used to adjust the distance of the heating wire body 811, the multiple packing strap stretching mechanism 7 includes a packing strap clamping assembly 77, the packing strap clamping assembly 77 is used to perform a centering and limiting clamping function on the packing strap, the multiple packing strap stretching mechanism 7 is used to perform a simultaneous stretching function on both sides of multiple packing straps.
[0025] In this embodiment, the heating wire adjustment mechanism 8 includes a bidirectional electric push rod 81. The lower end of the bidirectional electric push rod 81 is fixedly installed on the upper end of the oven body 1. The bidirectional electric push rod 81 is located on the side of the slide groove 5 away from the guide groove 6. The ends of the front and rear telescopic rods of the bidirectional electric push rod 81 are fixedly installed with moving rods 82. The ends of the two moving rods 82 that are far apart from each other are fixedly installed with L-shaped moving plates 83. The lower end of each L-shaped moving plate 83 is fixedly installed with a first rack 84. The right side of the first rack 84 is meshed with an intermediate gear 85. The right side of the intermediate gear 85 is meshed with a second rack 87. The middle of the ends of the first rack 84 and the second rack 87 on the same side that are far apart from each other are fixedly installed with contact strips 89. The outer end of each contact strip 89 is fixedly installed with a heating plate 810. The ends of the two heating plates 810 on the same side that are close to each other are fixedly installed with multiple vertically distributed heating wire bodies 811.
[0026] Specifically, the heating wire adjustment mechanism 8 can be used to adjust the spacing between the heating wire bodies 811 of different thicknesses of packing tape. At this time, the bidirectional electric push rod 81 can be directly powered and controlled by an external power supply. The telescopic rod end of the bidirectional electric push rod 81 directly drives the moving rod 82 to move. The two moving rods 82 move closer to each other. The moving rod 82 directly drives the L-shaped moving plate 83 to slide in the slide groove 5. The L-shaped moving plate 83 directly drives the first rack 84 to move. The first rack 84 drives the intermediate gear 85 to rotate, which in turn drives the follower shaft 86 to rotate. The follower shaft 86 directly drives the second rack 87 to move in the opposite direction to the first rack 84. Each first rack 84 and second rack 87 directly drives the contact bar 89, heating plate 810 and heating wire body 811 to move. The spacing between the two heating plates 810 on the same side is adjusted, so the spacing between the heating wire bodies 811 on the same side is adjusted.
[0027] In this embodiment, the multi-strap stretching mechanism 7 includes a stepper motor 71. The stepper motor 71 is fixedly installed at the lower right side of the oven body 1 near the oven body 1. A rotating rod 72 is fixedly installed at the output end of the stepper motor 71. Two symmetrically arranged moving strips 73 are threadedly connected to the outer end of the rotating rod 72. The lower end of the moving strips 73 is slidably connected to the lower inner wall of the oven cavity 2. Two symmetrically arranged L-shaped frames 74 are fixedly installed at the ends of the two moving strips 73 that are far apart from each other. A moving frame 75 is fixedly installed on the upper end of the two L-shaped frames 74 on the same side. Two symmetrically arranged placement slots 76 are opened on the surface of the moving frame 75. Strap clamping components 77 are provided on the inner walls of the front and rear sections of each placement slot 76.
[0028] Specifically, the multi-strap stretching mechanism 7 can simultaneously power and control multiple unidirectional electric push rods 771 via an external power supply and controller. The telescopic ends of the unidirectional electric push rods 771 directly drive the clamping plates 772 and anti-slip strips 773 to move. The anti-slip strips 773 on the clamping plates 772 in the same group move closer together. Once the two sets of symmetrically arranged anti-slip strips 773 clamp the ends of the strapping bands, the stepper motor 71 can be powered and controlled via the external power supply and controller. The output of the stepper motor 71 directly drives the rotating rod 72 to rotate. The rotating rod 72 then directly drives two symmetrically arranged moving strips 73 to move away from each other. Each moving strip 73 directly drives two symmetrically arranged L-shaped frames 74 to move. The two L-shaped frames 74 directly drive the moving frame 75 and multiple sets of strapping band clamping assemblies 77 to move, thus completing the stretching action of multiple strapping bands.
[0029] In this embodiment, the packing strap clamping assembly 77 includes a one-way electric push rod 771. Each one-way electric push rod 771 is fixedly installed on the inner wall of the placement groove 76 at one end near the inner wall of the placement groove 76. Each one-way electric push rod 771 has a clamping plate 772 fixedly installed at the end of its telescopic rod. The outer wall of the clamping plate 772 is slidably connected to the inner wall of the placement groove 76. Multiple anti-slip strips 773 are fixedly installed on the inner end of the clamping plate 772 in a uniformly distributed manner.
[0030] Specifically, multiple unidirectional electric push rods 771 are simultaneously powered and controlled by an external power supply and an external controller. At this time, the telescopic rod end of the unidirectional electric push rod 771 directly drives the clamping plate 772 and the anti-slip strip 773 to move. The anti-slip strips 773 on the clamping plate 772 in the same group move closer to each other. When the two sets of symmetrically arranged anti-slip strips 773 clamp the end of the packing strap, the packing strap is clamped.
[0031] In this embodiment, the outer wall of the L-shaped movable plate 83 is slidably connected to the inner wall of the slide groove 5, and the lower end of the L-shaped movable plate 83 passes through the lower end of the slide groove 5.
[0032] Specifically, ensure that the L-shaped moving plate 83 slides stably within the groove 5.
[0033] In this embodiment, a follower shaft 86 is fixedly installed at the middle of the upper end of the intermediate gear 85, and the upper end of the follower shaft 86 is rotatably connected to the inner wall of the top of the oven body 1 through a bearing.
[0034] Specifically, the intermediate gear 85 directly drives the follower shaft 86 to rotate, which improves the stability of the intermediate gear 85 during rotation.
[0035] In this embodiment, a guide post 88 is fixedly installed on the upper end of each second rack 87, the outer wall of each guide post 88 is slidably connected to the inner wall of the guide groove 6, and the upper end of each guide post 88 passes through the upper end of the oven body 1.
[0036] Specifically, the guide post 88 can be used to ensure the straightness of the second rack 87 during its movement.
[0037] In this embodiment, the outer end of the rotating rod 72 has two threaded grooves with opposite directions of rotation, and the end of the rotating rod 72 away from the stepper motor 71 is rotatably connected to the inner left wall of the oven body 1 through a bearing.
[0038] Specifically, ensure that the rotating rod 72 does not interfere with the inner wall of the oven body 1 during rotation.
[0039] In this embodiment, the outer wall of the L-shaped frame 74 is slidably connected to the inner wall of the vertical groove 4, and the movable frame 75 is set corresponding to the horizontal groove 3.
[0040] Specifically, ensure that the L-shaped frame 74 slides stably on the inner wall of the vertical groove 4, and ensure that the moving frame 75 does not interfere with the oven body 1 during the movement.
[0041] Working Principle: First, multiple unidirectional electric push rods 771 are simultaneously powered and controlled by an external power supply and controller. The telescopic ends of the unidirectional electric push rods 771 directly drive the clamping plates 772 and anti-slip strips 773 to move. The anti-slip strips 773 on the clamping plates 772 in the same group move closer together. Once the two sets of symmetrically arranged anti-slip strips 773 clamp the end of the packing strap, adjustments are made according to the thickness of the packing strap. At this time, the bidirectional electric push rods 81 are directly powered and controlled by an external power supply. The telescopic ends of the bidirectional electric push rods 81 directly drive the moving rods 82 to move. The two moving rods 82 move closer together, causing the L-shaped moving plate 83 to slide within the groove 5. The L-shaped moving plate 83 then directly drives the first rack 84 to move, which in turn drives the intermediate gear 85 to rotate, thereby driving the follower shaft 86 to rotate. The follower shaft 86 then directly drives the second… The rack 87 moves in the opposite direction to the first rack 84. At this time, each of the first rack 84 and the second rack 87 directly drives the contact bar 89, the heating plate 810 and the heating wire body 811 to move. The distance between the two heating plates 810 on the same side is adjusted, so the distance between the heating wire bodies 811 on the same side is adjusted. Next, the heating wire body 811 is powered and controlled by the external power supply and the external controller. At this time, the heating wire body 811 directly heats the packing strap body. Next, the stepper motor 71 is powered and controlled by the external power supply and the external controller. At this time, the output of the stepper motor 71 directly drives the rotating rod 72 to rotate. At this time, the rotating rod 72 directly drives the two symmetrically arranged moving bars 73 to move away from each other. At this time, each moving bar 73 directly drives the two symmetrically arranged L-shaped frames 74 to move. The two L-shaped frames 74 directly drive the moving frame 75 and multiple sets of packing strap clamping components 77 to move. At this time, the stretching action of multiple packing straps can be completed.
[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An oven for secondary stretching of packing straps, comprising an oven body (1), characterized in that: The oven body (1) has an oven cavity (2) at its inner end. Horizontal grooves (3) are provided on the upper parts of both sides of the oven body (1). Each horizontal groove (3) is connected to a vertical groove (4) symmetrically arranged on both sides of the oven body (1). Both the horizontal grooves (3) and the vertical grooves (4) are connected to the oven cavity (2). A sliding groove (5) and a guide groove (6) are provided in the middle of the upper end of the oven body (1). The guide groove (6) is located on the right side of the sliding groove (5). Multiple [unclear text - possibly related to oven body (1)] are provided on the oven body (1). The package strap stretching mechanism (7) and the heating wire adjustment mechanism (8) are provided. The heating wire adjustment mechanism (8) includes a heating wire body (811). The heating wire adjustment mechanism (8) is used to adjust the distance of the heating wire body (811). The multi-package strap stretching mechanism (7) includes a package strap clamping assembly (77). The package strap clamping assembly (77) is used to perform a centering and limiting clamping action on the package straps. The multi-package strap stretching mechanism (7) is used to perform a simultaneous stretching action on both sides of multiple package straps.
2. The drying oven for secondary stretching of packing straps according to claim 1, characterized in that: The heating wire adjustment mechanism (8) includes a bidirectional electric push rod (81). The lower end of the bidirectional electric push rod (81) is fixedly installed on the upper end of the oven body (1). The bidirectional electric push rod (81) is located on the side of the slide groove (5) away from the guide groove (6). The ends of the front and rear telescopic rods of the bidirectional electric push rod (81) are both fixedly installed with moving rods (82). The ends of the two moving rods (82) are both fixedly installed with L-shaped moving plates (83) at opposite ends. The lower end of each L-shaped moving plate (83) is fixedly installed with a first... A rack (84) is connected to an intermediate gear (85) on its right side. A second rack (87) is connected to the right side of the intermediate gear (85). On the same side, the first rack (84) and the second rack (87) are fixedly installed with contact strips (89) at the middle of their ends away from each other. A heating plate (810) is fixedly installed at the outer end of each contact strip (89). On the same side, a plurality of vertically distributed heating wire bodies (811) are fixedly installed at the ends of the two heating plates (810) that are close to each other.
3. The drying oven for secondary stretching of packing straps according to claim 1, characterized in that: The multi-strap stretching mechanism (7) includes a stepper motor (71). The stepper motor (71) is fixedly installed at the lower right side of the oven body (1) near the oven body (1). A rotating rod (72) is fixedly installed at the output end of the stepper motor (71). Two symmetrically arranged moving strips (73) are threaded to the outer end of the rotating rod (72). The lower end of the moving strips (73) is slidably connected to the inner wall of the lower end of the oven cavity (2). Two symmetrically arranged L-shaped frames (74) are fixedly installed at the ends of the two moving strips (73) that are far away from each other. A moving frame (75) is fixedly installed on the upper end of the two L-shaped frames (74) on the same side. Two symmetrically arranged placement slots (76) are opened on the surface of the moving frame (75). A strapping clamping component (77) is provided on the inner wall of the front and rear sections of each placement slot (76).
4. The drying oven for secondary stretching of packing straps according to claim 3, characterized in that: The packing strap clamping assembly (77) includes a one-way electric push rod (771). Each one-way electric push rod (771) is fixedly installed on the inner wall of the placement groove (76) at one end. Each one-way electric push rod (771) has a clamping plate (772) fixedly installed at the end of its telescopic rod. The outer wall of the clamping plate (772) is slidably connected to the inner wall of the placement groove (76). Multiple anti-slip strips (773) are fixedly installed on the inner end of the clamping plate (772) in a uniform distribution.
5. The drying oven for secondary stretching of packing straps according to claim 2, characterized in that: The outer wall of the L-shaped movable plate (83) is slidably connected to the inner wall of the slide groove (5), and the lower end of the L-shaped movable plate (83) passes through the lower end of the slide groove (5).
6. The drying oven for secondary stretching of packing straps according to claim 2, characterized in that: The middle part of the upper end of the intermediate gear (85) is fixedly installed with a follower shaft (86), and the upper end of the follower shaft (86) is rotatably connected to the inner wall of the top of the oven body (1) through a bearing.
7. The drying oven for secondary stretching of packing straps according to claim 2, characterized in that: Each of the second racks (87) has a guide post (88) fixedly installed at its upper end. The outer wall of each guide post (88) is slidably connected to the inner wall of the guide groove (6). The upper end of each guide post (88) passes through the upper end of the oven body (1).
8. The drying oven for secondary stretching of packing straps according to claim 3, characterized in that: The outer end of the rotating rod (72) has two threaded grooves with opposite directions of rotation. The end of the rotating rod (72) away from the stepper motor (71) is rotatably connected to the inner left wall of the oven body (1) through a bearing.
9. The drying oven for secondary stretching of packing straps according to claim 3, characterized in that: The outer wall of the L-shaped frame (74) is slidably connected to the inner wall of the vertical groove (4), and the movable frame (75) is set in relation to the horizontal groove (3).