Track width adjusting system

Abstract

The invention relates to a track width adjusting system which comprises a vacuum area width adjusting device and a non-vacuum width adjusting device, and the vacuum area width adjusting device is arranged in a welding furnace vacuum area of a reflow welding furnace and comprises a fixed track fixing base, a movable track moving plate, a movable track moving mechanism and a first driving mechanism. The movable rail moving mechanism comprises a first lead screw, a first nut and a vacuum sealing transmission assembly, the vacuum sealing transmission assembly penetrates through the vacuum cavity wall and the hearth wall, the first lead screw is connected with the vacuum sealing transmission assembly, and a first driving mechanism arranged outside the reflow soldering furnace is connected with the vacuum sealing transmission assembly; the non-vacuum width adjusting device is arranged in a welding furnace non-vacuum area of the reflow welding furnace and comprises a second driving mechanism, a linkage mechanism and a plurality of adjusting suspension mechanisms, each adjusting suspension mechanism comprises a side wall fixing plate, a movable end base, a fixed end base and a lead screw transmission assembly, and a linkage chain B is connected with synchronous chain wheels B in all the adjusting suspension mechanisms. And one adjusting suspension mechanism is connected with a second driving mechanism arranged outside the furnace.

Description

Technical Field

[0001] The invention relates to the technical field of reflow soldering, and in particular to a track width adjustment system. Background Art

[0002] The reflow oven is a device used to solder circuit boards with electronic components. It provides a heating environment to melt the solder paste so that the surface mounted components and circuit boards can be reliably combined through the solder paste alloy.

[0003] The entrance and exit of the reflow oven are equipped with modular drive devices, which are located in the area before the circuit board enters the furnace process and after the process is completed. During the process, the entrance drive module is used to connect the circuit board from the previous process of the process line to the furnace automatically. After being heated by the hot air in the furnace, the entire temperature curve is completed, and then the circuit board is automatically output to the next process through the exit drive module, realizing the full automation of the entire production line and improving production efficiency.

[0004] Different circuit boards have different widths. For furnaces that use chains (special structures with protrusions on one end) to transport circuit boards, different track widths are required when passing through the furnace. For the simplest single-channel furnace, generally one guide rail is fixed and the other guide rail moves back and forth to achieve different furnace widths.

[0005] The guide rail moving device generally adopts chain-driven screw nut transmission or gear rack transmission in the industry. The existing guide rail moving device has the following disadvantages: 1. Nowadays, furnaces are getting longer and longer, so it is necessary to set up many sets of width adjustment mechanisms in the furnace to move and adjust the moving rail at the same time. When there are too many width adjustment mechanisms or there is a problem of system instability, if one set of width adjustment mechanisms is stuck, the others will not work, pull each other, the guide rail will bend and deform, and the circuit board will fall or get stuck; 2. The screw nut transmission generally sets a sprocket outside the furnace, drives the sprocket through the chain, rotates the screw in the furnace, and then drives the nut installed on the moving rail to move back and forth, thereby driving the moving rail to move and adjust the width; due to the external transmission, it is necessary to consider the sealing and heat dissipation of the furnace, which is difficult to install and the transmission chain is complicated. 3. The gear rack is complicated to process and has high installation accuracy requirements. Since the gear rack transmission is not self-locking, the position cannot be fixed after the width is adjusted, and it is easily disturbed by various factors, causing the moving rail to move back and forth. Summary of the invention

[0006] In view of the shortcomings of the prior art mentioned above, the technical problem to be solved by the present invention is to provide a track width adjustment system, which can realize the segmented adjustment of the moving rail in the reflow soldering furnace, effectively reduce the risk of jamming when the total length of the moving rail is too large, and can reduce the impact on the vacuum area and non-vacuum area of ​​the soldering furnace.

[0007] To achieve the above-mentioned purpose, the present invention provides a track width adjustment system, which is used for adjusting the track width in a reflow soldering furnace. The reflow soldering furnace is provided with a moving track and a fixed track. The reflow soldering furnace is divided into a plurality of sections along its length extension direction, and includes a soldering furnace vacuum zone and a soldering furnace non-vacuum zone. Both sides of the soldering furnace vacuum zone have vacuum cavity walls located on the inner side of the furnace chamber walls on both sides of the reflow soldering furnace. The track width adjustment system includes a vacuum zone width adjustment device and a non-vacuum zone width adjustment device. The moving track is disconnected in different sections, and the part located in the soldering furnace vacuum zone is a first moving track section, and the part located in the soldering furnace non-vacuum zone is a second moving track section. The fixed track is disconnected in different sections, and the part located in the soldering furnace vacuum zone is a first fixed track section, and the part located in the soldering furnace non-vacuum zone is a second fixed track section.

[0008] The vacuum zone width adjustment device is arranged in the vacuum zone of the welding furnace, and comprises a fixed rail fixing seat, a movable rail moving plate, a movable rail moving mechanism and a first driving mechanism. The fixed rail fixing seat is fixedly arranged in the vacuum zone of the welding furnace, and the movable rail moving mechanism comprises a first screw rod, a first nut and a vacuum sealing transmission assembly. The vacuum sealing transmission assembly passes through the vacuum chamber wall and the furnace chamber wall on one side of the vacuum zone of the welding furnace, and is sealed with the vacuum chamber wall. The first screw rod is located in the vacuum zone of the welding furnace, and one end of the first screw rod is connected to the vacuum sealing transmission assembly. The first nut is installed on the first screw rod, and the movable rail moving plate is fixedly connected to the first nut; the first movable rail section is fixedly connected to the movable rail moving plate, and the fixed rail fixing seat is fixedly arranged in the vacuum zone of the welding furnace and is fixedly connected to the first fixed rail section; the first driving mechanism is arranged outside the reflow oven and is connected to one side of the vacuum sealing transmission assembly outside the oven, and the first driving mechanism drives the first screw rod to rotate through the vacuum sealing transmission assembly;

[0009] The non-vacuum air conditioning and widening device is arranged in the non-vacuum area of ​​the welding furnace, and includes a second driving mechanism, a linkage mechanism, and multiple adjusting suspension mechanisms; the adjusting suspension mechanism includes a side wall fixing plate, a movable end seat, a fixed end seat and a screw transmission assembly, the side wall fixing plates are two, and are respectively fixedly connected to the furnace walls on both sides of the non-vacuum area of ​​the welding furnace, the screw transmission assembly includes a second screw rod and a second nut installed on the second screw rod, the two ends of the second screw rod are respectively installed on the side wall fixing plates on both sides, and the second screw rod is fixed with a synchronous sprocket B located in the non-vacuum area of ​​the welding furnace; the movable end seat is fixed to the second nut, the movable end seat is fixedly connected to the second moving rail section, the fixed end seat is fixedly arranged in the non-vacuum area of ​​the welding furnace, and is fixedly connected to the second fixed rail section; the linkage mechanism includes a linkage chain B connected to the synchronous sprocket B on the second screw rods in all the adjusting suspension mechanisms; the second screw rod of one of the adjusting suspension mechanisms extends out of the non-vacuum area of ​​the welding furnace, and is connected to the second driving mechanism arranged outside the reflow oven.

[0010] Preferably, the vacuum zone width adjustment device also includes a first guide mechanism, which includes a first guide rod and a first guide member, wherein both ends of the first guide rod are respectively fixedly connected to the furnace walls on both sides of the vacuum zone of the welding furnace and are parallel to the first screw rod, and the first guide member is installed on the first guide rod and fixedly connected to the moving rail movable plate, and the first guide member can move along the first guide rod.

[0011] Preferably, the vacuum sealing transmission component of the vacuum zone width adjustment device adopts a magnetic fluid sealing transmission component.

[0012] More preferably, there are multiple movable rail moving mechanisms, and each first lead screw is kept parallel, the vacuum sealing transmission assembly has an intermediate transmission shaft connecting the first lead screw and the first driving mechanism, and a synchronous sprocket A located on the outside of the furnace wall of the vacuum zone of the welding furnace is arranged on the intermediate transmission shaft, and the vacuum zone width adjustment device also includes a linkage chain A connecting the synchronous sprockets A on all the first lead screws; the first driving mechanism is connected to the vacuum sealing transmission assembly of one of the movable rail moving mechanisms.

[0013] More preferably, the first driving mechanism of the vacuum zone width adjusting device includes a first motor, a driving chain, a driving sprocket A and a driving sprocket B, the vacuum sealing transmission assembly has an intermediate transmission shaft connecting the first screw rod and the first driving mechanism, the driving sprocket A is fixed to the output shaft of the first motor, the driving sprocket B is fixed to the intermediate transmission shaft of the vacuum sealing transmission assembly, and the driving chain connects the driving sprocket A and the driving sprocket B.

[0014] Preferably, when the non-vacuum zone of the soldering furnace is located at both ends of the reflow soldering furnace, the adjustment suspension mechanism connected to the second driving mechanism in the vacuum air conditioning and widening device is located outside the entrance or outside the exit of the non-vacuum zone of the soldering furnace.

[0015] Preferably, the second driving mechanism of the non-vacuum air-width adjustment device includes a second motor and a coupling, and the output shaft of the second motor is connected to the second screw rod through the coupling.

[0016] Preferably, the adjustment suspension mechanism of the non-vacuum air width adjustment device also includes a second guide mechanism, the second guide mechanism includes a second guide rod and a second guide member, both ends of the second guide rod are respectively connected to the side wall fixing plate and are parallel to the second screw rod, the second guide member is installed on the second guide rod and fixedly connected to the movable end seat, and the second guide member can move along the second guide rod.

[0017] Preferably, at least one adjusting suspension mechanism in the non-vacuum air width adjustment device is also provided with a chain tensioning assembly, and the chain tensioning assembly is connected to the linkage chain B and is used to adjust the tension of the linkage chain B.

[0018] Preferably, the first screw and the second screw both adopt self-locking trapezoidal threads.

[0019] As described above, the track width adjustment system according to the present invention has the following beneficial effects:

[0020] 1. By adjusting the moving rail in the reflow oven in sections, each section is adjusted independently, and the transmission path adopted can be effectively shortened, which can effectively reduce the risk of jamming caused by the long and complex structure of the total transmission path of the width adjustment device when the total length of the moving rail 2 is too large. In addition, the section adjustment method can be used to appropriately adjust the distances of different sections according to actual working conditions, which is flexible and variable.

[0021] 2. The first movable rail section is adjusted in the vacuum zone of the welding furnace through the vacuum zone width adjusting device, which can stably and conveniently adjust the first movable rail section and ensure the airtightness of the vacuum zone of the welding furnace. The relevant chains and driving mechanism parts are arranged outside the furnace to reduce the impact on the temperature distribution and airflow inside the vacuum zone of the welding furnace.

[0022] 3. The second movable rail section is adjusted in the non-vacuum area of ​​the welding furnace through a non-vacuum air width adjustment device, which can stably and conveniently adjust the second movable rail section, and for the non-vacuum air width adjustment device arranged on the inlet and outlet sides of the reflow soldering furnace, the adjustment suspension mechanism connected to the second driving mechanism is arranged outside the inlet or outside the outlet of the non-vacuum area of ​​the welding furnace, and the entire non-vacuum air width adjustment device only enters and exits the non-vacuum area of ​​the welding furnace through a synchronous sprocket B, which can effectively reduce the impact on the temperature distribution and airflow inside the non-vacuum area of ​​the welding furnace.

[0023] 4. The screw nut transmission structure used has a self-locking function. The position cannot be fixed after width adjustment and is easily disturbed by various factors, causing movement problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Shown is a schematic structural diagram of the vacuum reflow oven and its internal fixed rails and moving rails in the present invention.

[0025] Figure 2 Display as Figure 1 Top view of the .

[0026] Figure 3 It is a schematic diagram showing the structure of the vacuum zone width adjustment device in the present invention.

[0027] Figure 4 Display as Figure 3 Top view of the .

[0028] Figure 5 Shown is a side view of the vacuum area of ​​the soldering oven.

[0029] Figure 6 Display as Figure 5 Cross-sectional view of CC in .

[0030] Figure 7 It is a schematic diagram showing the structure of the non-vacuum air conditioning width adjustment device located before the vacuum zone of the welding furnace in the present invention.

[0031] Figure 8 Shown is a schematic diagram of the structure of the inlet adjustment suspension mechanism in a non-vacuum air width adjustment device.

[0032] Fig. 9 Shown is a schematic diagram of the structure of the intermediate adjustment suspension mechanism in a non-vacuum air width adjustment device.

[0033] Fig.10 It is a schematic diagram showing the structure of the non-vacuum air-conditioning widening device located after the vacuum zone of the welding furnace in the present invention.

[0034] Description of Figure Numbers

[0035]

[0036] DETAILED DESCRIPTION

[0037] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0038] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0039] refer to Figures 1 to 10The present invention provides a track width adjustment system for adjusting the track width in a reflow soldering furnace. A moving track 2 and a fixed track 3 are provided in the reflow soldering furnace 1. The reflow soldering furnace 1 is divided into a plurality of sections along its length extension direction, and includes a soldering furnace vacuum zone 11 and a soldering furnace non-vacuum zone 12. The number and position of the soldering furnace vacuum zone 11 and the soldering furnace non-vacuum zone 12 are set according to actual needs. The two sides of the soldering furnace vacuum zone 11 are provided with vacuum chamber walls 111 located on the inner side of the furnace chamber walls 13 on both sides of the reflow soldering furnace 1. The track width adjustment system of the present invention includes a vacuum zone width adjustment device 4 and a non-vacuum zone width adjustment device 5. The parts of the moving track 2 in different sections are disconnected and independent of each other, and the part located in the soldering furnace vacuum zone 11 is the first moving track section 21, and the part located in the soldering furnace non-vacuum zone 12 is the second moving track section 22. In the connected sections, the parts of the fixed track 3 in different sections are disconnected, and the part located in the soldering furnace vacuum zone 11 is the first fixed track section 31, and the part located in the soldering furnace non-vacuum zone 12 is the second fixed track section 32.

[0040] refer to Figures 3 to 6 The vacuum zone width adjusting device 4 is arranged in the vacuum zone 11 of the welding furnace, and is used to adjust the width between the first movable rail section 21 and the first fixed rail section 31. The vacuum zone width adjusting device 4 includes a fixed rail fixing seat 42, a movable rail moving plate 41, a movable rail moving mechanism 43 and a first driving mechanism. The fixed rail fixing seat 42 is fixedly arranged in the vacuum zone 11 of the welding furnace. The movable rail moving mechanism 43 includes a first screw rod 431, a first nut 432 and a vacuum sealing transmission component 433. The vacuum sealing transmission component 433 passes through the vacuum chamber wall 111 and the furnace wall 13 on one side of the vacuum zone 11 of the welding furnace, and is sealed with the vacuum chamber wall 111. The first screw rod 431 is located in the vacuum zone 11 of the welding furnace, and one end thereof It is connected to the vacuum sealing transmission component 433, and the other end can be installed in the fixed rail fixing seat 42 or on the vacuum chamber wall 111 to ensure that the first screw rod 431 is stably installed. The first nut 432 is installed on the first screw rod 431, and the movable rail moving plate 41 is fixedly connected to the first nut 432; the first movable rail segment 21 is fixedly connected to the movable rail moving plate 41, and the fixed rail fixing seat 42 is fixedly arranged in the vacuum area 11 of the welding furnace and is fixedly connected to the first fixed rail segment 31; the first driving mechanism is arranged outside the reflow soldering furnace 1 and is connected to one side of the vacuum sealing transmission component 433 outside the furnace, and the first driving mechanism drives the first screw rod 431 to rotate through the vacuum sealing transmission component 433.

[0041] refer to Figure 7 , Figure 8 and Fig. 9The non-vacuum air width adjustment device 5 is arranged in the non-vacuum area 12 of the welding furnace, and is used to adjust the width of the second movable rail section 22 and the second fixed rail section 32. The non-vacuum air width adjustment device 5 includes a second driving mechanism, a linkage mechanism, and a plurality of adjusting suspension mechanisms 6; the adjusting suspension mechanism 6 includes a side wall fixing plate 61, a movable end seat 62, a fixed end seat 63 and a screw transmission assembly 64. There are two side wall fixing plates 61, which are respectively fixedly connected to the furnace walls 13 on both sides of the non-vacuum area 12 of the welding furnace. The screw transmission assembly 64 includes a second screw rod 641 and a second nut 642 installed on the second screw rod 641. The two ends of the second screw rod 641 are respectively installed on the side wall fixing plates 61 on both sides. , and a synchronous sprocket B66 located in the non-vacuum area 12 of the welding furnace is fixed on the second screw rod 641; the movable end seat 62 is fixed to the second nut 642, the movable end seat 62 is fixedly connected to the second movable rail section 22, and the fixed end seat 63 is fixedly arranged in the non-vacuum area 12 of the welding furnace, and is fixedly connected to the second fixed rail section 32 to ensure that the second fixed rail section 32 remains fixed; the linkage mechanism includes a linkage chain B8 connected to the synchronous sprocket B66 on the second screw rod 641 in all the adjusting suspension mechanisms 6; the second screw rod 641 of one of the adjusting suspension mechanisms 6 extends out of the non-vacuum area 12 of the welding furnace, and is connected to the second driving mechanism arranged outside the reflow soldering furnace 1.

[0042] The main working principle of the track width adjustment system of the present invention is as follows:

[0043] (a) In the vacuum zone 11 of the welding furnace, the vacuum zone width adjustment device 4 adjusts the width between the first movable rail segment 21 and the first fixed rail segment 31 by adjusting the movement of the first movable rail segment 21. When the width needs to be adjusted, the first drive mechanism outside the furnace works to drive the vacuum sealing transmission assembly 433, thereby driving the first screw rod 431 to rotate, and the first nut 432 drives the movable rail moving plate 41 to move axially along the first screw rod 431, while the first fixed rail segment 31 remains fixed, so as to flexibly adjust the width between the first movable rail segment 21 and the first fixed rail segment 31, wherein the first screw rod 431 is generally perpendicular to the first fixed rail segment 31 and the first movable rail segment 21. In the vacuum zone 11 of the welding furnace, the outside of the first drive mechanism and part of the vacuum sealing transmission assembly 433 are located outside the furnace, which is convenient for operation and maintenance, and the sealing of the transmission connection between the inside and outside of the vacuum zone is achieved through the vacuum sealing transmission assembly 433, and the operation of the first drive mechanism will not affect the temperature distribution and airflow inside the vacuum zone 11 of the welding furnace.

[0044] (b) In the non-vacuum area 12 of the welding furnace, since the non-vacuum area 12 of the welding furnace generally has a large length, multiple adjustment suspension mechanisms 6 are set to simultaneously move the second movable rail segment 22 to achieve width adjustment and reduce the problem of jamming, wherein the number and spacing of the adjustment suspension mechanisms 6 can be set according to actual needs. When width adjustment is required, the second drive mechanism outside the furnace is started to drive one of the adjustment suspension mechanisms 6 to work, specifically, directly driving the second screw rod 641 therein to rotate, and driving the movable end seat 62 and the second movable rail segment 22 to move axially along the second screw rod 641 through the second nut 642, while the second fixed rail segment 32 remains fixed, thereby flexibly adjusting the width between the second movable rail segment 22 and the second fixed rail segment 32, wherein the first screw rod 431 is generally perpendicular to the first fixed rail segment 31 and the first movable rail segment 21. When the second driving mechanism drives the adjustment suspension mechanism 6 to move, the synchronous sprocket B66 on the second screw rod 641 drives the linkage chain B8, and the linkage chain B8 drives the synchronous sprockets B66 and the second screw rod 641 of all other adjustment suspension mechanisms 6 to rotate synchronously, so that the moving end seats 62 in all the adjustment suspension mechanisms 6 move synchronously and at the same speed, thereby driving the second moving rail section 22 to move together. In the non-vacuum area 12 of the welding furnace, the second driving mechanism is set outside the furnace for easy operation and maintenance. The synchronous sprocket B66 drives all the adjustment suspension mechanisms 6 in the furnace, which can reduce the impact on the temperature distribution and airflow in the furnace.

[0045] The track width adjustment system of the present invention adjusts the moving track 2 in the reflow soldering furnace 1 in sections, and each section is adjusted independently. The transmission path adopted can be effectively shortened, and the risk of jamming caused by the excessively long and complex structure of the total transmission path of the width adjustment device when the total length of the moving track 2 is too large can be effectively reduced. In addition, the segmented adjustment method can be used to appropriately adjust the distances of different sections according to actual working conditions, which is flexible and variable.

[0046] The technical solution of the present invention is further described below in conjunction with the specific implementation methods of each embodiment.

[0047] Vacuum zone width adjustment device 4:

[0048] In this embodiment, reference Figure 3 and Figure 4As a preferred design, the vacuum zone width adjustment device 4 also includes a first guide mechanism 48, which includes a first guide rod 481 and a first guide member 482. The first guide rod 481 is installed in the vacuum zone 11 of the welding furnace and is parallel to the first screw rod 431. Specifically, one end of the first guide rod 481 is installed in the fixed end seat 63, and the other end passes through the movable end seat 62 and is installed in a vacuum inner fixed plate 49 fixed to the vacuum chamber wall 111. Of course, the two ends of the first guide rod 481 can also be directly connected to the vacuum chamber walls 111 on both sides. The first guide member 482 is installed on the first guide rod 481 and is fixedly connected to the moving rail moving plate 41. The first guide member 482 can adopt a guide sleeve, a slider and other structures. The first guide member 482 can move along the first guide rod 481. The movement of the moving rail moving plate 41 can be stably guided by the first guide mechanism 48, wherein two or more sets of the first guide mechanism 48 can be set and maintained at a certain distance.

[0049] In this embodiment, reference Figure 3 , Figure 4 and Figure 6 As a preferred design, the vacuum sealing transmission component 433 adopts a magnetic fluid sealing transmission component. The magnetic fluid sealing transmission component can adopt an existing design, for example, the structure in patent CN204805552U can be adopted. The outer shell of the vacuum sealing transmission component 433 and the vacuum chamber wall 111 are sealed by a sealing component 434. The sealing component 434 can adopt a high-temperature sealing ring. The intermediate transmission shaft located in the outer shell is kept sealed by a magnetic fluid seal. During operation, the outer shell does not move, and the first drive mechanism transmits the movement to the first screw 431 through the intermediate transmission shaft. The intermediate transmission shaft always maintains a good seal through the magnetic fluid during the movement. The magnetic fluid sealing transmission component can ensure the sealing of the inner and outer sides of the vacuum chamber wall 111 and stabilize the transmission.

[0050] In this embodiment, reference Figure 3 and Figure 4As a preferred design, there are multiple movable rail moving mechanisms 43, and each first screw rod 431 is kept parallel to each other. The vacuum sealing transmission assembly 433 has an intermediate transmission shaft connecting the first screw rod 431 and the first driving mechanism, and a synchronous sprocket A44 located outside the furnace wall 13 of the vacuum zone 11 of the welding furnace is arranged on the intermediate transmission shaft. The vacuum zone width adjustment device 4 also includes a linkage chain A (not shown in the drawings) connecting the synchronous sprockets A44 on all the first screw rods 43; the first driving mechanism is connected to the vacuum sealing transmission assembly 433 of one of the movable rail moving mechanisms 43. When working, the first driving mechanism drives the vacuum sealing transmission assembly 433 of one of the movable rail moving mechanisms 43, and each vacuum sealing transmission assembly 433 realizes synchronous movement through the synchronous sprocket A44 and the linkage chain A, so that all the movable rail moving mechanisms 43 move synchronously and drive the movable rail moving plate 41 to move together. When the length of the vacuum zone 11 of the welding furnace is large, the distance between the two first guide mechanisms 48 is also large, and the parallelism between the first guide rods 481 will deteriorate. The use of multiple moving rail moving mechanisms 43 for synchronous rotation and width adjustment can effectively reduce the problem of jamming. In addition, the synchronous sprocket A44 and the linkage chain A are both arranged outside the furnace, which will not affect the temperature distribution and airflow inside the vacuum zone 11 of the welding furnace.

[0051] In this embodiment, reference Figure 3 and Figure 4 As a preferred design, the first driving mechanism of the vacuum zone width adjustment device 4 includes a first motor 47, a driving chain (not shown in the drawings), a driving sprocket A46 and a driving sprocket B45. The vacuum seal transmission assembly 433 has an intermediate transmission shaft connecting the first screw rod 431 and the first driving mechanism. The driving sprocket A46 is fixed to the output shaft of the first motor 47, and the driving sprocket B45 is fixed to the intermediate transmission shaft of the vacuum seal transmission assembly 433. The driving chain connects the driving sprocket A46 and the driving sprocket B45. The first motor 47 drives the driving sprocket A46, and drives the driving sprocket B45 through the driving chain, thereby driving the vacuum seal transmission assembly 433 and the first screw rod 431 to rotate. The first motor 47 preferably adopts a servo motor, and the encoder zero position of the servo motor can be set, and a sensor of the type of high temperature resistant optical fiber can be set to detect the movement of the first movable rail segment 21 to ensure whether it is adjusted in place. In other embodiments, the first driving mechanism can also adopt other existing suitable structural forms.

[0052] In this embodiment, reference Figure 3 and Figure 4 As a preferred design, the first screw rod 43 adopts a self-locking trapezoidal thread, which can form a self-locking effect with the first nut 432 to prevent the first movable rail section 21 from moving after adjustment, thereby enhancing reliability.

[0053] Non-vacuum air-conditioning device 5:

[0054] In this embodiment, as a preferred design, when the non-vacuum area 12 of the soldering furnace is located at both ends of the reflow soldering furnace 1, the adjustment suspension mechanism 6 connected to the second driving mechanism in the vacuum widening device is located outside the inlet or outlet of the non-vacuum area 12 of the soldering furnace, and the remaining adjustment suspension mechanisms 6 are located inside the non-vacuum area 12 of the soldering furnace. Figure 1 and Figure 2 The reflow soldering furnace 1 includes three sections, the middle section is the soldering furnace vacuum zone 11, the front and rear sections are the soldering furnace non-vacuum zones 12, the front end of the soldering furnace non-vacuum zone 12 before the soldering furnace vacuum zone 11 is the inlet end, and the structure of the vacuum widening device is as shown in FIG. Figure 7 , Figure 8 and Fig. 9 As shown, the adjustment suspension mechanism 6 connected to the second driving mechanism is located outside the inlet of the welding furnace non-vacuum zone 12, which can be called the inlet adjustment suspension mechanism 6, and the other adjustment suspension mechanisms 6 are recorded as intermediate adjustment suspension mechanisms 6. The specific number of intermediate adjustment suspension mechanisms 6 can be set according to needs. The intermediate adjustment suspension mechanisms 6 are all located in the welding furnace non-vacuum zone 12 and do not extend out of the furnace walls 13 on both sides of the welding furnace non-vacuum zone 12. In this way, only the synchronous sprocket B66 enters and exits the welding furnace non-vacuum zone 12, which can further reduce the impact on the temperature distribution and airflow inside the welding furnace non-vacuum zone 12. The rear end of the welding furnace non-vacuum zone 12 after the welding furnace vacuum zone 11 is the outlet end, and the structure of the vacuum air conditioning and widening device therein is referred to as Fig.10 As shown, the regulating suspension mechanism 6 connected to the second driving mechanism is marked as the outlet regulating suspension mechanism 6, and is located outside the outlet of the non-vacuum area 12 of the welding furnace.

[0055] In this embodiment, reference Figure 7 , Figure 8 and Fig. 9 As a preferred design, the second driving mechanism of the non-vacuum air-conditioning and widening device 5 includes a second motor 7 and a coupling. The output shaft of the second motor 7 is connected to the second screw rod 641 through a coupling. The second driving mechanism can also adopt other design structures.

[0056] In this embodiment, reference Figure 7 , Figure 8 and Fig. 9As a preferred design, the adjustment suspension mechanism 6 also includes a second guide mechanism 65, which includes a second guide rod 651 and a second guide member 652. The two ends of the second guide rod 651 are respectively connected to the side wall fixing plate 61 and are parallel to the second screw rod 641. The second guide member 652 is installed on the second guide rod 651 and is fixedly connected to the mobile end seat 62. The second guide member 652 can move along the second guide rod 651, wherein the second guide member 652 is installed on the second guide rod 651 through a guide roller, and a sleeve or a slider can also be used. The movement of the mobile end seat 62 can be better stabilized by the second guide mechanism 65, and the number of the second guide mechanisms 65 can be set to two or more.

[0057] In this embodiment, reference Figure 7 , Figure 8 and Fig. 9 As a preferred design, at least one adjusting suspension mechanism 6 in the non-vacuum air width adjustment device 5 is also provided with a chain tensioning assembly 67, which can be specifically arranged in the adjusting suspension mechanism 6 located outside the inlet and outlet of the non-vacuum zone 12 of the welding furnace. The chain tensioning assembly 67 can be fixedly mounted on the fixed end seat 63. The chain tensioning assembly 67 is connected to the linkage chain B8 and is used to adjust the tensioning degree of the linkage chain B8.

[0058] In this embodiment, reference Figure 7 , Figure 8 and Fig. 9 As a preferred design, at least one of the adjustment suspension mechanisms 6 in the non-vacuum air width adjustment device 5 is further provided with a chain tensioning assembly 67, which can be fixedly mounted on the fixed end seat 63, and the chain tensioning assembly 67 is connected to the linkage chain B8, and is used to adjust the tension of the linkage chain B8. In addition, the adjustment suspension mechanism 6 also includes an idler wheel 68 arranged on the fixed end seat 63, which is used to change the direction of the linkage chain B8, so as to better capture the linkage chain B8.

[0059] In this embodiment, reference Figure 7 , Figure 8 and Fig. 9 As a preferred design, the second screw rod 641 also adopts a self-locking trapezoidal thread, which can form a self-locking effect with the second nut 642 to prevent the second movable rail section 22 from moving after adjustment, thereby enhancing reliability.

[0060] Based on the technical solutions of the above embodiments, the track width adjustment system of the present invention has the following beneficial effects:

[0061] 1. By adjusting the moving rail 2 in the reflow oven 1 in sections, each section is adjusted independently, and the transmission path adopted can be effectively shortened, which can effectively reduce the risk of jamming caused by the long and complex structure of the total transmission path of the width adjustment device when the total length of the moving rail 2 is too large. In addition, the segmented adjustment method can be used to appropriately adjust the distances of different sections according to actual working conditions, which is flexible and variable.

[0062] 2. The first movable rail section 21 is adjusted in the vacuum zone 11 of the welding furnace through the vacuum zone width adjusting device 4, which can stably and conveniently adjust the first movable rail section 21 and ensure the airtightness in the vacuum zone 11 of the welding furnace. The relevant chains and driving mechanism parts are arranged outside the furnace to reduce the influence on the temperature distribution and airflow inside the vacuum zone 11 of the welding furnace.

[0063] 3. The second movable rail segment 22 is adjusted in the non-vacuum zone 12 of the welding furnace by the non-vacuum air width adjustment device 5, and the second movable rail segment 22 can be adjusted stably and conveniently. In addition, for the non-vacuum air width adjustment device 5 arranged on the inlet and outlet sides of the reflow soldering furnace 1, the adjustment suspension mechanism 6 connected to the second driving mechanism is arranged outside the inlet or outside the outlet of the non-vacuum zone 12 of the welding furnace. The entire non-vacuum air width adjustment device 5 enters and exits the non-vacuum zone 12 of the welding furnace only through the synchronous sprocket B66, which can effectively reduce the impact on the temperature distribution and airflow inside the non-vacuum zone 12 of the welding furnace.

[0064] 4. The screw nut transmission structure used has a self-locking function. The position cannot be fixed after width adjustment and is easily disturbed by various factors, causing movement problems.

[0065] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0066] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A track width adjustment system, used for adjusting the track width in a reflow soldering furnace (1), wherein the reflow soldering furnace (1) is provided with a movable track (2) and a fixed track (3), wherein the reflow soldering furnace (1) is divided into a plurality of sections along its length extension direction, and comprises a soldering furnace vacuum zone (11) and a soldering furnace non-vacuum zone (12), wherein both sides of the soldering furnace vacuum zone (11) are provided with vacuum chamber walls (111) located inside the furnace chamber walls (13) on both sides of the reflow soldering furnace (1), characterized in that: The track width adjustment system comprises a vacuum zone width adjustment device (4) and a non-vacuum zone width adjustment device (5); the movable track (2) is disconnected in different sections, and the section located in the vacuum zone (11) of the welding furnace is a first movable track section (21), and the section located in the non-vacuum zone (12) of the welding furnace is a second movable track section (22); the fixed track (3) is disconnected in different sections, and the section located in the vacuum zone (11) of the welding furnace is a first fixed track section (31), and the section located in the non-vacuum zone (12) of the welding furnace is a second fixed track section (32); The vacuum zone width adjustment device (4) is arranged in the vacuum zone (11) of the welding furnace, and comprises a fixed rail fixing seat (42), a movable rail moving plate (41), a movable rail moving mechanism (43) and a first driving mechanism. The fixed rail fixing seat (42) is fixedly arranged in the vacuum zone (11) of the welding furnace. The movable rail moving mechanism (43) comprises a first screw rod (431), a first nut (432) and a vacuum sealing transmission component (433). The vacuum sealing transmission component (433) passes through a vacuum chamber wall (111) and a furnace wall (13) on one side of the vacuum zone (11) of the welding furnace, and is sealed with the vacuum chamber wall (111). The first screw rod (431) is located in the vacuum zone of the welding furnace. (11), one end of which is connected to the vacuum sealing transmission component (433), the first nut (432) is installed on the first screw rod (431), and the movable rail moving plate (41) is fixedly connected to the first nut (432); the first movable rail section (21) is fixedly connected to the movable rail moving plate (41), the fixed rail fixing seat (42) is fixedly arranged in the vacuum area (11) of the welding furnace and is fixedly connected to the first fixed rail section (31); the first driving mechanism is arranged outside the reflow soldering furnace (1) and is connected to the side of the vacuum sealing transmission component (433) outside the furnace, and the first driving mechanism drives the first screw rod (431) to rotate through the vacuum sealing transmission component (433); The non-vacuum air conditioning and widening device (5) is arranged in the non-vacuum area (12) of the welding furnace, and comprises a second driving mechanism, a linkage mechanism, and a plurality of adjusting suspension mechanisms (6); the adjusting suspension mechanism (6) comprises a chamber wall fixing plate (61), a movable end plate (62), a fixed end plate (63) and a screw transmission assembly (64); the chamber wall fixing plates (61) are two and are respectively fixedly connected to the chamber walls (13) on both sides of the non-vacuum area (12) of the welding furnace; the screw transmission assembly (64) comprises a second screw rod (641) and a second nut (642) installed on the second screw rod (641); the two ends of the second screw rod (641) are respectively installed on the chamber wall fixing plates (61) on both sides; and the second screw rod (6 A synchronous sprocket B (66) located in the non-vacuum area (12) of the welding furnace is fixed on the movable end plate (62); the movable end plate (62) is fixed to the second nut (642), the movable end plate (62) is fixedly connected to the second movable rail section (22), the fixed end plate (63) is fixedly arranged in the non-vacuum area (12) of the welding furnace, and is fixedly connected to the second fixed rail section (32); the linkage mechanism includes a linkage chain B (8) connected to the synchronous sprocket B (66) on the second screw rod (641) in all the adjustment suspension mechanisms (6); the second screw rod (641) of one of the adjustment suspension mechanisms (6) extends out of the non-vacuum area (12) of the welding furnace, and is connected to the second driving mechanism arranged outside the reflow soldering furnace (1).

2. The track width adjustment system according to claim 1, characterized in that: The vacuum zone width adjustment device (4) further comprises a first guide mechanism (48), wherein the first guide mechanism (48) comprises a first guide rod (481) and a first guide member (482), wherein both ends of the first guide rod (481) are respectively fixedly connected to the furnace walls (13) on both sides of the welding furnace vacuum zone (11) and are parallel to the first screw rod (431), and the first guide member (482) is mounted on the first guide rod (481) and is fixedly connected to the movable rail moving plate (41), and the first guide member (482) can move along the first guide rod (481).

3. The track width adjustment system according to claim 1, characterized in that: The vacuum sealing transmission component (433) of the vacuum zone width adjustment device (4) adopts a magnetic fluid sealing transmission component.

4. The track width adjustment system according to claim 1 or 3, characterized in that: There are multiple movable rail moving mechanisms (43), and each first screw rod (431) is kept parallel to each other. The vacuum sealing transmission assembly (433) has an intermediate transmission shaft connecting the first screw rod (431) and the first driving mechanism, and a synchronous sprocket A (44) located outside the furnace wall (13) of the vacuum zone (11) of the welding furnace is arranged on the intermediate transmission shaft. The vacuum zone width adjustment device (4) also includes a linkage chain A connecting the synchronous sprockets A (44) on all the first screw rods; the first driving mechanism is connected to the vacuum sealing transmission assembly (433) of one of the movable rail moving mechanisms (43).

5. The track width adjustment system according to claim 1 or 3, characterized in that: The first driving mechanism of the vacuum zone width adjustment device (4) comprises a first motor (47), a driving chain, a driving sprocket A (46) and a driving sprocket B (45); the vacuum sealing transmission assembly (433) comprises an intermediate transmission shaft connecting the first screw rod (431) and the first driving mechanism; the driving sprocket A (46) is fixed to the output shaft of the first motor (47); the driving sprocket B (45) is fixed to the intermediate transmission shaft of the vacuum sealing transmission assembly (433); and the driving chain connects the driving sprocket A (46) and the driving sprocket B (45).

6. The track width adjustment system according to claim 1, characterized in that: When the non-vacuum area (12) of the soldering furnace is located at both ends of the reflow soldering furnace (1), the adjustment suspension mechanism (6) connected to the second driving mechanism in the vacuum air conditioning and widening device (5) is located outside the entrance or outside the exit of the non-vacuum area (12) of the soldering furnace.

7. The track width adjustment system according to claim 1, characterized in that: The second driving mechanism of the non-vacuum air conditioning and widening device (5) comprises a second motor (7) and a coupling, and the output shaft of the second motor (7) is connected to the second screw rod (641) via the coupling.

8. The track width adjustment system according to claim 1, characterized in that: The adjustment suspension mechanism (6) of the non-vacuum air width adjustment device (5) also includes a second guide mechanism (65), the second guide mechanism (65) includes a second guide rod (651) and a second guide member (652), the two ends of the second guide rod (651) are respectively connected to the side wall fixing plate (61) and are parallel to the second screw rod (641), the second guide member (652) is installed on the second guide rod (651) and is fixedly connected to the movable end seat (62), and the second guide member (652) can move along the second guide rod (651).

9. The track width adjustment system according to claim 1, characterized in that: At least one adjusting suspension mechanism (6) in the non-vacuum air width adjustment device (5) is also provided with a chain tensioning assembly (67), wherein the chain tensioning assembly (67) is connected to the linkage chain B (8) and is used to adjust the tension of the linkage chain B (8).

10. The track width adjustment system according to claim 1, characterized in that: The first screw and the second screw (641) both adopt self-locking trapezoidal threads.

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