Multistage low boiling distillation purification device for silane coupling agent and implementation method thereof

Abstract

The application discloses a multistage low-boiling distillation purification device for silane coupling agent and an implementation method thereof, and belongs to the technical field of low-boiling distillation purification. The multistage low-boiling distillation purification device for silane coupling agent and the implementation method thereof comprise a pump body and a material box, the material box is connected with one end of a distillation kettle through the pump body, and the other end of the distillation kettle is connected with an impurity collecting box and a purification collecting box in two ways. The application solves the problem that, when the existing stirring mechanism rotates, the middle rod of the circle paddle and the vertical plate can only rotate synchronously with the stirring shaft, and cannot rotate and stretch out and draw back, and the rotation inertia and other factors generated by stirring result in that the stirring and mixing efficiency cannot reach the fastest speed during heating. The application realizes horizontal rotation, vertical rotation and stretch-out and draw-back movement of the stirring blade, and can maximally and quickly mix the silane coupling agent in disorder during the stirring process, and can accelerate the heating of the silane coupling agent through internal and external heating.

Description

Technical Field

[0001] This invention relates to the field of low-boiling distillation purification technology, specifically to a multi-stage low-boiling distillation purification apparatus for silane coupling agents and its implementation method. Background Technology

[0002] Chinese patent CN218572842U discloses a multi-stage distillation purification device for a silane coupling agent production line, including a distillation kettle, a stirring shaft, and a drive motor. It also includes a stirring mechanism, which consists of a fan plate, an inclined plate, a central rod, a vertical plate, and a ring paddle. The distillation kettle has a rotating stirring shaft installed in the middle of the tank body through a hole. The power shaft of the stirring shaft, which extends out of the top of the distillation kettle, is nested and connected to the power output end of the drive motor to obtain power. The drive motor is locked to the top base of the distillation kettle with bolts.

[0003] While the aforementioned patent achieves highly efficient stirring of silane coupling agents during heating and distillation in a distillation vessel, it still has the following drawbacks:

[0004] The central rods of the paddle and the vertical plate can be welded and fixed at the stirring shaft between the three vertical plates. When the stirring mechanism rotates, the central rods of the paddle and the vertical plate can only rotate synchronously with the stirring shaft, and cannot rotate on their own or extend and retract. Due to factors such as the rotational inertia generated by stirring, the stirring and mixing efficiency cannot reach the fastest speed when heating. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage low-boiling distillation purification apparatus and its implementation method for silane coupling agents. By using horizontal rotation, vertical rotation, and telescopic movement of the stirring blades, the silane coupling agent is mixed randomly to the maximum extent and speed during the stirring process, which also accelerates the heating of the silane coupling agent. This solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-stage low-boiling distillation purification device for silane coupling agents, comprising a pump body and a material tank, wherein the material tank is connected to one end of the distillation vessel via the pump body, and the other end of the distillation vessel is connected in two ways to an impurity collection tank and a purification collection tank.

[0007] It also includes a support frame that surrounds and supports the bottom of the distillation vessel. The rotating component connected to the power component on the support frame is located inside the distillation vessel. One end of the positioning component is located inside the rotating component, and the other end extends out and connects to the distillation vessel. The rotating component is equipped with several telescopic stirring components distributed along the axial direction.

[0008] The distillation vessel is fitted with a heating assembly, and a condensation assembly connected to a purification collection box is also provided at the top of the distillation vessel.

[0009] Preferably, the top side of the distillation vessel is provided with a feed inlet connected to the pump body, and the bottom center of the distillation vessel is provided with a discharge pipe connected to the impurity collection box, and the discharge pipe is also equipped with a valve.

[0010] Preferably, the power assembly includes a geared motor and a rotating shaft. The geared motor is bolted to the platform of the support frame, and one end of the rotating shaft is connected to the shaft of the geared motor via a coupling.

[0011] Preferably, the rotating assembly includes a rotating cylinder, a collar, a support ring, and a bracket. The bottom surface of the rotating cylinder is fixed to the other end of the rotating shaft, and the collar is fixed on the outer circumferential surface of the rotating cylinder. The support ring is fitted onto the collar, and the two are connected by a bearing. Several brackets are arranged radially along the support ring and fixed to the inner wall of the distillation vessel.

[0012] Preferably, the positioning assembly includes a suspension tube, a positioning tube, a first bevel gear, and an eccentric rod. The positioning tube has a structure closed at both ends. Each positioning tube is provided with a first bevel gear. The positioning tubes are connected to each other by an eccentric rod at an eccentric position. One end of the suspension tube passes through the distillation vessel and is fixed. The other end of the suspension tube passes through the rotating cylinder and is connected to the positioning tube at the uppermost end. The positioning tube at the lowermost end is inserted into the bearing of the rotating cylinder.

[0013] Preferably, the telescopic stirring assembly includes a drive shaft, a stirring shaft, stirring blades, a second bevel gear, a limiting strip, a flared ring, a locking synchronization ring, a first connecting rod, and a second connecting rod. A second bevel gear that meshes with the first bevel gear is connected to the port of the drive shaft, and the limiting strip is fixed along the axial direction of the drive shaft.

[0014] The stirring shaft is a hollow structure with one end open and the other end closed. The open end is fitted onto the drive shaft, and a flared ring is fixed on the outer edge of the opening. The flared ring and the inner circumferential surface of the stirring shaft are provided with a groove for locking onto the limiting strip.

[0015] The other end of the stirring shaft extends out of the rotating cylinder, wherein the stirring shaft and the rotating cylinder are sealed together, and a plurality of stirring blades are arranged along the axis of the stirring shaft;

[0016] One end of the first connecting rod is fitted with an annular hole on the eccentric rod. The other end of the first connecting rod is movably connected to one end of the second connecting rod via a rotating shaft. The other end of the second connecting rod is movably connected to a locking synchronizing ring. The locking synchronizing ring is fitted on a flared ring and is used for the flared ring to rotate within the locking synchronizing ring. The locking synchronizing ring synchronously drives the flared ring to slide along the axial direction of the transmission shaft.

[0017] Preferably, the heating assembly includes an outer spiral heating wire, a heat insulation sleeve, an inner spiral heating wire, a conductive ring, and a conductive rod. The heat insulation sleeve is fitted onto the distillation vessel, and the outer spiral heating wire is placed between the heat insulation sleeve and the distillation vessel.

[0018] The inner spiral heating wire is distributed on the inner wall of the rotating cylinder. The inner spiral heating wire is connected to the conductive ring at the top of the inner wall of the rotating cylinder. The conductive rod is inserted into the rotating cylinder along the suspension tube and contacts the conductive ring. The conductive rod and the outer spiral heating wire are connected to the electrical box on the distillation kettle.

[0019] Preferably, the condensation assembly includes a steam pipe, a locking ring, a spiral tube, a water inlet pipe, and a water outlet pipe. The steam pipe is arranged in an inverted "U" shape, with one end connected to the distillation vessel. The locking ring is located at the junction of the curved and straight sections of the steam pipe, and the locking ring separates the steam pipe to form a steam chamber and a condensation chamber. The spiral tube is placed in the condensation chamber and one end is fixed to the inner edge of the locking ring. The other end of the spiral tube extends out of the steam pipe and is connected to the purification collection box.

[0020] The inlet and outlet pipes are connected to the lower and upper ends of the condensation chamber, respectively.

[0021] Another technical solution proposed in this invention: a method for multi-stage low-boiling distillation purification of silane coupling agents, comprising the following steps:

[0022] S1: The valve of the discharge pipe is closed, and the pump body is started to draw the silane coupling agent in the material box and discharge it into the distillation kettle through the feed port;

[0023] S2: The outer spiral heating wire and the inner spiral heating wire are activated under the control of the electrical box, heating the inside and outside of the distillation vessel from the inside and outside directions;

[0024] S3: The geared motor starts and drives the rotating shaft and rotating cylinder to rotate synchronously. The rotating cylinder rotates around the support ring. During the rotation, the stirring shaft rotates synchronously with the rotating cylinder. Since the position of the first bevel gear is fixed, the second bevel gear moves along the first bevel gear and generates its own rotation. When the rotating cylinder rotates one revolution, it will drive the first connecting rod to rotate around the eccentric rod. The second connecting rod drives the stirring shaft to move along the transmission shaft, realizing the horizontal rotation, self-rotation and radial extension of the stirring blades while stirring the silane coupling agent.

[0025] S4: After the heated silane coupling agent reaches its boiling point, it flows into the spiral tube through the steam pipe. Cold water flows into the condensation chamber through the water inlet pipe and is discharged from the water outlet pipe. After heat exchange between the steam and cold water in the spiral tube, the steam is liquefied and discharged into the purification collection box.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. This invention, through the eccentric setting of the eccentric rod, ensures that the distance between the stirring shaft and the eccentric rod at the connection point of the rotating cylinder during rotation is not constant, thus achieving the purpose of extension and retraction of the stirring shaft. In order not to affect the rotation of the stirring shaft, a locking synchronization ring is used to fit around the flared ring, allowing the stirring shaft to both rotate and move along the transmission shaft. This enables the stirring blades to rotate horizontally, rotate vertically, and move in extension and retraction. During the stirring process, the silane coupling agent is mixed randomly to the maximum extent and speed, which also accelerates the heating of the silane coupling agent.

[0028] 2. In this invention, the conductive ring and the inner spiral heating wire are driven to rotate synchronously by a rotating cylinder. The conductive rod is in a fixed position, so the conductive ring can always contact the conductive rod when rotating, thereby transmitting electrical energy to the conductive rod to power the inner spiral heating wire. The heating of the silane coupling agent is accelerated by internal and external heating. Attached Figure Description

[0029] Figure 1 This is an overall front axonometric view of the present invention;

[0030] Figure 2 This is an isometric view of the overall rear side of the present invention;

[0031] Figure 3 This is a cross-sectional view of the condensation assembly of the present invention;

[0032] Figure 4 This is a diagram showing the separation of the insulation sleeve and the outer spiral heating wire of the present invention;

[0033] Figure 5 This is a cross-sectional internal view of the distillation vessel of the present invention;

[0034] Figure 6 This is a diagram of the internal structure of the rotating component of the present invention;

[0035] Figure 7 This is a structural diagram of the telescopic stirring assembly of the present invention;

[0036] Figure 8 This is a partial structural diagram of the present invention.

[0037] In the diagram: 1. Pump body; 2. Material box; 3. Distillation kettle; 4. Heating assembly; 41. Outer spiral heating wire; 42. Insulation sleeve; 43. Inner spiral heating wire; 44. Conductive ring; 45. Conductive rod; 5. Condensation assembly; 51. Steam pipe; 52. Locking ring; 53. Spiral tube; 54. Water inlet pipe; 55. Water outlet pipe; 6. Support frame; 7. Power assembly; 71. Gear motor; 72. Rotating shaft; 8. Rotating assembly; 81. 82. Rotating cylinder; 83. Collar; 84. Support ring; 9. Bracket; 9. Positioning assembly; 91. Suspension pipe; 92. Positioning tube; 93. First bevel gear; 94. Eccentric rod; 10. Telescopic stirring assembly; 101. Drive shaft; 102. Stirring shaft; 103. Stirring blade; 104. Second bevel gear; 105. Limiting strip; 106. Flared ring; 107. Locking synchronization ring; 108. First connecting rod; 109. Second connecting rod. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] To address the issue that in existing designs where the central rods of the impeller and vertical plate can be welded and fixed at the stirring shaft between the three vertical plates, the central rods of the impeller and vertical plate can only rotate synchronously with the stirring shaft during the stirring mechanism's rotation, without being able to rotate independently or extend / retract. This results in rotational inertia and other factors causing the mixing efficiency to be insufficient during heating. Please refer to [link to relevant documentation]. Figures 1-8 This embodiment provides the following technical solution:

[0040] A multi-stage low-boiling distillation purification device for silane coupling agents includes a pump body 1 and a material tank 2. The material tank 2 is connected to one end of a distillation vessel 3 via the pump body 1. The other end of the distillation vessel 3 is connected to an impurity collection tank and a purification collection tank via two separate paths.

[0041] It also includes a support frame 6, which surrounds and supports the bottom of the distillation vessel 3. The power component 7 on the support frame 6 is connected to the rotating component 8, which is located inside the distillation vessel 3. One part of the positioning component 9 is located inside the rotating component 8, and the other part extends out and is connected to the distillation vessel 3. The rotating component 8 is provided with several telescopic stirring components 10 distributed along the axial direction.

[0042] The distillation vessel 3 is fitted with a heating component 4, and the top of the distillation vessel 3 is also equipped with a condensation component 5 connected to the purification collection box.

[0043] The top side of the distillation vessel 3 is provided with an inlet that is connected to the pipeline of the pump body 1, and the bottom center of the distillation vessel 3 is provided with an outlet pipe that is connected to the impurity collection box, and the outlet pipe is also equipped with a valve.

[0044] The number of distillation kettles 3 is set according to the requirements. If the number is more than one, the condenser assembly 5 between the distillation kettles 3 is connected to the feed pipe through a pipeline, and the pump body 1 is connected to the feed port of the outermost distillation kettle 3. The condenser assembly 5 on the outermost distillation kettle 3 on the other side is connected to the purification collection box, thereby realizing multiple low-boiling distillations.

[0045] Specifically, the pump body 1 draws the silane coupling agent from the material box 2 and sends it into the distillation kettle 3. After the heating component 4 is started, it heats the silane coupling agent to the boiling point. At the same time, the power component 7 controls the rotating component 8 to rotate, so that the telescopic stirring component 10 can perform three actions at the same time: horizontal rotation, vertical rotation and synchronous telescopic movement.

[0046] The power assembly 7 includes a geared motor 71 and a rotating shaft 72. The geared motor 71 is mounted on the platform of the support frame 6 by bolts, and one end of the rotating shaft 72 is connected to the shaft of the geared motor 71 by a coupling.

[0047] The rotating assembly 8 includes a rotating cylinder 81, a collar 82, a support ring 83, and a bracket 84. The bottom surface of the rotating cylinder 81 is fixed to the other end of the rotating shaft 72. The collar 82 is fixed on the outer circumferential surface of the rotating cylinder 81. The support ring 83 is fitted on the collar 82, and the two are connected by a bearing. Several brackets 84 are arranged radially along the support ring 83 and fixed to the inner wall of the distillation vessel 3.

[0048] The geared motor 71 drives the rotating shaft 72 to rotate, thereby driving the rotating cylinder 81 to rotate. Together with the support ring 83 and the bracket 84, the rotating cylinder 81 is supported, so that the rotating cylinder 81 is supported when it rotates, and its stability is ensured when it rotates.

[0049] The positioning assembly 9 includes a suspension tube 91, a positioning tube 92, a first bevel gear 93, and an eccentric rod 94. The positioning tube 92 has a structure that is closed at both ends. Each positioning tube 92 is provided with a first bevel gear 93. The positioning tubes 92 are connected to each other by an eccentric rod 94 at an eccentric position. One end of the suspension tube 91 passes through the distillation vessel 3 and is fixed. The other end of the suspension tube 91 passes into the rotating cylinder 81 and is connected to the positioning tube 92 located at the uppermost end. The positioning tube 92 located at the lowermost end is inserted into the bearing of the rotating cylinder 81.

[0050] The top of the suspension tube 91 is supported by the distillation vessel 3. The suspension tube 91 is inserted into the rotating cylinder 81. The rotating cylinder 81 and the suspension tube 91 are sealed together. So while the rotating cylinder 81 is rotating, the positions of the suspension tube 91, the positioning tube 92 and the eccentric rod 94 remain fixed.

[0051] The telescopic stirring assembly 10 includes a drive shaft 101, a stirring shaft 102, a stirring blade 103, a second bevel gear 104, a limiting strip 105, a flared ring 106, a locking synchronization ring 107, a first connecting rod 108, and a second connecting rod 109. The second bevel gear 104, which meshes with the first bevel gear 93, is connected to the port of the drive shaft 101. The limiting strip 105 is fixed along the axial direction of the drive shaft 101.

[0052] The stirring shaft 102 is a hollow structure with one end open and the other end closed. The open end is fitted onto the drive shaft 101, and a flared ring 106 is fixed on the outer edge of the opening. The flared ring 106 and the inner circumferential surface of the stirring shaft 102 are provided with a groove that is locked onto the limiting strip 105.

[0053] The flared ring 106 and the stirring shaft 102 can only move along the limiting strip 105, which limits the direction of movement of the stirring blade 103.

[0054] The other end of the stirring shaft 102 extends out of the rotating cylinder 81, wherein the stirring shaft 102 and the rotating cylinder 81 are sealed together, and a plurality of stirring blades 103 are arranged along the axis of the stirring shaft 102.

[0055] One end of the first connecting rod 108 is fitted with an annular hole on the eccentric rod 94. The other end of the first connecting rod 108 is movably connected to one end of the second connecting rod 109 via a rotating shaft. The other end of the second connecting rod 109 is movably connected to the locking synchronizing ring 107. The locking synchronizing ring 107 is fitted on the flared ring 106 and is used for the flared ring 106 to rotate within the locking synchronizing ring 107. The locking synchronizing ring 107 synchronously drives the flared ring 106 to slide along the axial direction of the transmission shaft 101.

[0056] By utilizing the eccentric setting of the eccentric rod 94, the distance between the connection between the stirring shaft 102 and the rotating cylinder 81 and the eccentric rod 94 during one rotation of the rotating cylinder 81 is not a constant value. This is used to achieve the purpose of extension and retraction of the stirring shaft 102. In order not to affect the rotation of the stirring shaft 102, the structure of the locking synchronization ring 107 being sleeved on the flared ring 106 is used, so that the stirring shaft 102 can both rotate on its own axis and move along the transmission shaft 101. This enables the stirring blade 103 to rotate horizontally, rotate vertically, and move in extension and retraction. During the stirring process, the silane coupling agent is mixed randomly to the maximum extent and speed, which can also accelerate the heating of the silane coupling agent.

[0057] The condenser assembly 5 includes a steam pipe 51, a locking ring 52, a spiral tube 53, a water inlet pipe 54, and a water outlet pipe 55. The steam pipe 51 is arranged in an inverted "U" shape, with one end connected to the distillation vessel 3. The locking ring 52 is located at the junction of the curved and straight parts of the steam pipe 51, and the locking ring 52 separates the steam pipe 51 to form a steam chamber and a condensation chamber. The spiral tube 53 is placed in the condensation chamber and is fixed at one end by the inner edge of the locking ring 52. The other end of the spiral tube 53 extends out of the steam pipe 51 and is connected to the purification collection box. The water inlet pipe 54 and the water outlet pipe 55 are connected to the lower and upper ends of the condensation chamber, respectively.

[0058] After the heated silane coupling agent reaches its boiling point, it flows into the spiral tube 53 through the steam pipe 51. The steam in the spiral tube 53 exchanges heat with the cold water and then liquefies before being discharged into the purification collection box.

[0059] To address the issues of slow, uneven heating (where heat is transferred gradually from the outside to the inside, resulting in higher temperatures at the outer edges than at the center) caused by existing external heating methods, please refer to [link to relevant documentation]. Figures 1-3 This embodiment provides the following technical solution:

[0060] Heating assembly 4 includes an outer spiral heating wire 41, a heat insulation sleeve 42, an inner spiral heating wire 43, a conductive ring 44, and a conductive rod 45. The heat insulation sleeve 42 is fitted onto the distillation vessel 3, and the outer spiral heating wire 41 is placed between the heat insulation sleeve 42 and the distillation vessel 3.

[0061] The inner spiral heating wire 43 is distributed on the inner wall of the rotating cylinder 81. The inner spiral heating wire 43 is connected to the conductive ring 44 at the top of the inner wall of the rotating cylinder 81. The conductive rod 45 is inserted into the rotating cylinder 81 along the suspension tube 91 and contacts the conductive ring 44. The conductive rod 45 and the outer spiral heating wire 41 are connected to the electrical box on the distillation kettle 3.

[0062] The conductive ring 44 and the inner spiral heating wire 43 are fixed on the rotating cylinder 81. The rotating cylinder 81 drives the conductive ring 44 and the inner spiral heating wire 43 to rotate synchronously. The conductive rod 45 is in a fixed position. Thus, the conductive ring 44 can always contact the conductive rod 45 when rotating, so that electrical energy can be transferred to the conductive rod 45 to supply power to the inner spiral heating wire 43. The heating of the silane coupling agent is accelerated through internal and external heating.

[0063] Specifically, this embodiment also proposes a method for multi-stage low-boiling distillation purification of silane coupling agents, including the following steps:

[0064] Step 1: The valve of the discharge pipe is closed, and the pump body 1 is started to draw the silane coupling agent in the material box 2 and discharge it into the distillation kettle 3 through the feed port;

[0065] Step 2: The outer spiral heating wire 41 and the inner spiral heating wire 43 are started under the control of the electrical box, heating the inner and outer sides of the distillation vessel 3 from the inside and outside directions;

[0066] Step 3: The geared motor 71 starts and drives the rotating shaft 72 and the rotating cylinder 81 to rotate synchronously. The rotating cylinder 81 rotates around the support ring 83. During the rotation, the stirring shaft 102 rotates synchronously with the rotating cylinder 81. Since the position of the first bevel gear 93 is fixed, the second bevel gear 104 moves along the first bevel gear 93 and rotates. When the rotating cylinder 81 rotates once, it will drive the first connecting rod 108 to rotate around the eccentric rod 94. The second connecting rod 109 drives the stirring shaft 102 to move along the transmission shaft 101, so as to realize the horizontal rotation, rotation and radial extension of the stirring blade 103 while stirring the silane coupling agent.

[0067] Step 4: After the heated silane coupling agent reaches its boiling point, it flows into the spiral tube 53 through the steam pipe 51. Cold water flows into the condensation chamber through the water inlet pipe 54 and is discharged from the water outlet pipe 55. After heat exchange between the steam and cold water in the spiral tube 53, the steam is liquefied and discharged into the purification collection box.

[0068] Working principle: When the valve of the discharge pipe is closed, the pump body 1 starts to draw the silane coupling agent in the material box 2 and discharge it into the distillation kettle 3 through the feed port; the outer spiral heating wire 41 and the inner spiral heating wire 43 heat the inner and outer sides of the distillation kettle 3 from the inside and outside directions; the geared motor 71 starts to drive the rotating shaft 72 and the rotating cylinder 81 to rotate synchronously; the stirring shaft 102 rotates synchronously with the rotating cylinder 81. Since the position of the first bevel gear 93 is fixed, when the rotating cylinder 81 rotates one revolution, it will drive the first connecting rod 108 and the second connecting rod 109 to rotate around the eccentric rod 94, which will drive the stirring shaft 102 to move along the transmission shaft 101, so as to realize the horizontal rotation, self-rotation and radial extension of the stirring blade 103 to stir the silane coupling agent at the same time.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0070] Although embodiments of the 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 invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage low-boiling distillation purification device for silane coupling agents, comprising a pump body (1) and a material tank (2), characterized in that; The material box (2) is connected to one end of the distillation vessel (3) via the pump body (1). The other end of the distillation vessel (3) is connected to the impurity collection box and the purification collection box in two separate ways. It also includes a support frame (6) which surrounds and supports the bottom of the distillation vessel (3). The rotating component (8) connected to the power component (7) on the support frame (6) is located inside the distillation vessel (3). One end of the positioning component (9) is located inside the rotating component (8), and the other end extends out and is connected to the distillation vessel (3). The rotating component (8) is provided with several telescopic stirring components (10) distributed along the axial direction. The distillation vessel (3) is fitted with a heating component (4). The top of the distillation vessel (3) is also provided with a condensing component (5) connected to the purification collection box. The power component (7) includes a geared motor (71) and a rotating shaft (72). The rotating component (8) includes a rotating cylinder (81). The bottom surface of the rotating cylinder (81) is fixed to the other end of the rotating shaft (72). The positioning component (9) includes a suspension pipe (91), a positioning pipe (92), and a first... A bevel gear (93) and an eccentric rod (94) are provided. The positioning tube (92) is a structure with both ends closed. A first bevel gear (93) is provided on each positioning tube (92). The positioning tubes (92) are connected by an eccentric rod (94) at an eccentric position. One end of the suspension tube (91) passes out of the distillation vessel (3) and is fixed. The other end of the suspension tube (91) passes into the rotating cylinder (81) and is connected to the positioning tube (92) located at the uppermost end. The positioning tube (92) located at the lowermost end is inserted into the bearing of the rotating cylinder (81). The telescopic stirring assembly (10) includes a drive shaft (101), a stirring shaft (102), stirring blades (103), a second bevel gear (104), a limiting strip (105), a flared ring (106), a locking synchronization ring (107), a first connecting rod (108), and a second connecting rod (109). The port of the drive shaft (101) is connected to a second bevel gear (104) that meshes with the first bevel gear (93). The limiting strip (105) is fixed along the axial direction of the drive shaft (101). The stirring shaft (102) is a hollow structure with one end open and the other end closed. The open end is fitted onto the transmission shaft (101), and a flared ring (106) is fixed on the outer edge of the opening. The flared ring (106) and the inner circumferential surface of the stirring shaft (102) are provided with a groove that is locked onto the limiting strip (105). The other end of the stirring shaft (102) extends through the rotating cylinder (81), wherein the stirring shaft (102) and the rotating cylinder (81) are sealed together, and a plurality of stirring blades (103) are arranged along the axis of the stirring shaft (102); One end of the first connecting rod (108) is fitted with an annular hole on the eccentric rod (94). The other end of the first connecting rod (108) is movably connected to one end of the second connecting rod (109) through a rotating shaft. The other end of the second connecting rod (109) is movably connected to the locking synchronizing ring (107). The locking synchronizing ring (107) is fitted on the flared ring (106) for the flared ring (106) to rotate inside the locking synchronizing ring (107). The locking synchronizing ring (107) synchronously drives the flared ring (106) to slide along the axial direction of the transmission shaft (101).

2. The multi-stage low-boiling distillation purification apparatus for silane coupling agents according to claim 1, characterized in that: The top side of the distillation vessel (3) is provided with an inlet that is connected to the pipeline of the pump body (1), and the bottom middle of the distillation vessel (3) is provided with an outlet pipe that is connected to the impurity collection box, and the outlet pipe is also equipped with a valve.

3. The multi-stage low-boiling distillation purification apparatus for silane coupling agents according to claim 1, characterized in that: The geared motor (71) is bolted to the platform of the support frame (6), and one end of the rotating shaft (72) is connected to the shaft of the geared motor (71) via a coupling.

4. The multi-stage low-boiling distillation purification apparatus for silane coupling agents according to claim 1, characterized in that: The rotating assembly (8) also includes a collar (82), a support ring (83) and a bracket (84). The collar (82) is fixed on the outer circumferential surface of the rotating cylinder (81). The support ring (83) is fitted on the collar (82), and the two are connected by a bearing. Several brackets (84) are arranged along the radial direction of the support ring (83) and fixed to the inner wall of the distillation vessel (3).

5. The multi-stage low-boiling distillation purification apparatus for silane coupling agents according to claim 4, characterized in that: The heating assembly (4) includes an outer spiral heating wire (41), a heat insulation sleeve (42), an inner spiral heating wire (43), a conductive ring (44), and a conductive rod (45). The heat insulation sleeve (42) is fitted onto the distillation vessel (3), and the outer spiral heating wire (41) is placed between the heat insulation sleeve (42) and the distillation vessel (3). The inner spiral heating wire (43) is distributed on the inner wall of the rotating cylinder (81). The inner spiral heating wire (43) is connected to the conductive ring (44) at the top of the inner wall of the rotating cylinder (81). The conductive rod (45) is inserted into the rotating cylinder (81) along the suspension tube (91) and contacts the conductive ring (44). The conductive rod (45) and the outer spiral heating wire (41) are connected to the electrical box on the distillation kettle (3).

6. The multi-stage low-boiling distillation purification apparatus for silane coupling agents according to claim 5, characterized in that: The condensation assembly (5) includes a steam pipe (51), a locking ring (52), a spiral tube (53), a water inlet pipe (54), and a water outlet pipe (55). The steam pipe (51) is arranged in an inverted "U" shape, with one end connected to the distillation vessel (3). The locking ring (52) is located at the junction of the curved and straight parts of the steam pipe (51). The locking ring (52) separates the steam pipe (51) to form a steam chamber and a condensation chamber. The spiral tube (53) is placed in the condensation chamber and one end is fixed to the inner edge of the locking ring (52). The other end of the spiral tube (53) passes through the steam pipe (51) and is connected to the purification collection box. The water inlet pipe (54) and the water outlet pipe (55) are connected to the lower and upper ends of the condensation chamber, respectively.

7. A method for implementing a multi-stage low-boiling distillation purification apparatus for silane coupling agents according to claim 6, characterized in that: Includes the following steps: S1: The valve of the discharge pipe is closed, and the pump body (1) is started to extract the silane coupling agent in the material box (2) and discharge it into the distillation kettle (3) through the feed port. S2: The outer spiral heating wire (41) and the inner spiral heating wire (43) are started under the control of the electrical box to heat the inner and outer sides of the distillation vessel (3) from the inside and outside directions; S3: The geared motor (71) starts to drive the rotating shaft (72) and the rotating cylinder (81) to rotate synchronously. The rotating cylinder (81) rotates around the support ring (83). During the rotation, the stirring shaft (102) rotates synchronously with the rotating cylinder (81). Since the position of the first bevel gear (93) is fixed, the second bevel gear (104) moves along the first bevel gear (93) to generate rotation. When the rotating cylinder (81) rotates once, it will drive the first connecting rod (108) to rotate around the eccentric rod (94), which will drive the stirring shaft (102) to move along the transmission shaft (101), so as to realize the horizontal rotation, rotation and radial extension of the stirring blade (103) while stirring the silane coupling agent. S4: After the heated silane coupling agent reaches the boiling point, it flows into the spiral tube (53) through the steam pipe (51). Cold water flows into the condensation chamber through the water inlet pipe (54) and is discharged from the water outlet pipe (55). After the steam in the spiral tube (53) exchanges heat with the cold water, it is liquefied and discharged into the purification collection box.

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