Baffle structure of main observation port of single crystal furnace

Abstract

The utility model discloses a baffle structure for a main observation port of a single crystal furnace, which comprises a pressing plate detachably connected to the observation port of the single crystal furnace, one side, far away from the single crystal furnace, of the pressing plate is detachably connected with an annular panel, and a metal baffle sheet is further arranged between the pressing plate and the panel, so that the metal baffle sheet can slide up and down on the outer side of the observation port of the single crystal furnace. The function of switching the observation state is achieved; the single crystal furnace observation window is reasonable in design structure, the metal blocking piece is detachably installed on the outer side of the single crystal furnace observation window through the pressing plate and the panel, the metal blocking piece can slide up and down in the first sliding groove, and when the observation window is not used, the visible area on the panel is closed; the pressing plate, the panel and the baffle form a cover body to cover the outer side of the observation window, so that the transparent glass is prevented from being collided and scratched when the observation window is not used, and the problem that the service life of the transparent glass is shortened due to the fact that the glass is always exposed outside and is easily collided and scratched when the observation window is not used in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to single crystal furnace observation window technical field, concretely is a single crystal furnace main observation port baffle structure. BACKGROUND

[0002] The preparation principle of single crystal silicon is that polycrystalline silicon is heated and fused into a molten state, the liquid surface is controlled at the crystallization critical point by controlling the heat field, and single crystal silicon is grown by pulling a single crystal seed crystal, at this time, the temperature needs to be maintained at 1420 DEG C, this process is carried out in the main furnace chamber, in order to facilitate the observation of the state of single crystal silicon growth, an observation window is usually arranged on the furnace cover of the main furnace chamber.

[0003] In the Chinese utility model patent with publication number CN208779965U, a switchable kiln observation port is disclosed, which is composed of a sealing plate and a transparent baffle, when observation is needed, the sealing plate is pulled to move to one side away from the transparent baffle, and the furnace is observed through the transparent baffle on the observation window, however, in the device, the sealing plate is located at the rear end of the transparent baffle, when switching the observation state, the glass is always located on the outside, when the observation window is not used, the glass is always exposed to the outside and is easy to be collided and scratched, which reduces the service life of the transparent glass. UTILITY MODEL CONTENT

[0004] The utility model aims at making up for the deficiency of prior art, and provides a single crystal furnace main observation port baffle structure.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A single crystal furnace main observation port baffle structure, which comprises a detachable pressing plate connected at a single crystal furnace observation port, an annular panel detachably connected to one side of the pressing plate away from the single crystal furnace, a first sliding groove formed in one side of the pressing plate close to the panel, and a metal baffle plate arranged between the pressing plate and the panel and slidably connected to the first sliding groove on both sides, so that the metal baffle plate slides up and down on the outside of the single crystal furnace observation port, and plays a role in switching the observation state.

[0007] A locking assembly is further arranged on the panel, one end of the locking assembly is inserted into one side of the metal baffle plate, and the locking assembly is used for fixing the position of the metal baffle plate.

[0008] Further, protrusions are arranged on both sides of the bottom of the metal baffle plate, and the protrusions are slidably connected to the first sliding groove on one side away from the panel.

[0009] The distance between the side surfaces of the two first sliding grooves away from each other at the top is smaller than the distance between the side surfaces of the two first sliding grooves away from each other at the bottom, and the distance between the two protrusions and the metal baffle plate is the same as the distance between the side surfaces of the two first sliding grooves away from each other at the top.

[0010] Further, the locking assembly comprises a positioning hole formed on the metal blocking piece and a reset knob plug installed on the panel;

[0011] One end of the reset knob plug penetrates the panel, and the end of the reset knob plug penetrating the panel penetrates the positioning hole, for locking the metal blocking piece.

[0012] Further, a connecting assembly is arranged below the metal blocking piece, the bottom of the connecting assembly is detachably connected with an auxiliary lens, and the width of the auxiliary lens is the same as the visible width of the middle part of the panel, so that when observing in a hot state, the auxiliary lens is moved to the visible window of the panel through the metal blocking piece.

[0013] Further, the connecting assembly comprises a T-shaped protrusion and a T-shaped clamping groove formed below the metal blocking piece, the outer side of the T-shaped protrusion is clamped with the inner wall of the T-shaped clamping groove, the bottom of the T-shaped protrusion is fixedly connected with a clamping sleeve, and the inner side of the clamping sleeve is clamped with the outer side of the auxiliary lens;

[0014] The panel is formed with a third sliding groove, the top and bottom of the third sliding groove are respectively communicated with the lower part of the panel and the middle part of the panel, the thickness of the third sliding groove is twice the thickness of the clamping sleeve, and the thickness of the clamping sleeve is the same as the thickness of the metal blocking piece.

[0015] Further, a limiting assembly is further arranged on the metal blocking piece, for preventing the metal blocking piece from sliding down in the upward movement;

[0016] The limiting assembly comprises a connecting shaft rotatably connected to the pressing plate, one end of the connecting shaft close to the panel is connected to the metal blocking piece through a connecting structure, so that the connecting shaft is driven to rotate in the upward and downward movement of the metal blocking piece;

[0017] The other end of the connecting shaft is connected with a control structure, for controlling the one-way rotation or bidirectional rotation of the connecting shaft, so that when the observation window is opened, the metal blocking piece is prevented from falling downward in the movement through the one-way rotation of the connecting shaft.

[0018] Further, the connecting structure comprises a second sliding groove formed on the pressing plate, the bottom of the second sliding groove is communicated with the first sliding groove, a rack is slidably connected in the second sliding groove, and the bottom of the rack is connected with the top of the protrusion;

[0019] One end of the connecting shaft extends to the inside of the second sliding groove, a gear is fixedly connected to one end of the connecting shaft located in the second sliding groove, and the gears located in the second sliding groove are respectively meshingly connected to the corresponding racks on the side close to each other.

[0020] Further, the control structure comprises a cavity formed on one side of the pressing plate, one end of the connecting shaft away from the gear extends to the inside of the cavity, a ratchet wheel is fixedly connected to one end of the connecting shaft located in the cavity, a stop block is slidably connected to one side of the ratchet wheel, and a reset assembly is arranged on the outer side of the stop block, for pushing the stop block to press on the surface of the ratchet wheel.

[0021] The outer side of the ratchet wheel is provided with a plurality of first inclined surfaces and second inclined surfaces, the length of the first inclined surface is greater than that of the second inclined surface, and the included angle of the connection between the first inclined surface close to the middle part of the ratchet wheel and the second inclined surface close to the middle part of the ratchet wheel is ninety degrees.

[0022] Further, the reset assembly comprises an elastic member, one end of the elastic member is fixedly connected with the inner wall of the chamber, the other end of the elastic member is provided with a control ring, the control ring is sleeved outside the ratchet wheel, the inner side of the control ring is connected with the side of the stopper away from the ratchet wheel.

[0023] The outer side of the control ring is provided with a control rod, the control rod extends to the outer side of the pressing plate through one side of the chamber.

[0024] Compared with the prior art, the single crystal furnace main observation port baffle structure has the following beneficial effects:

[0025] The metal baffle piece is detachably mounted outside the observation port of the single crystal furnace through the pressing plate and the panel, and the first sliding groove is formed in the pressing plate, so that the metal baffle piece can slide up and down in the first sliding groove, and when the observation window is not used, the visual area on the panel is closed by downward movement of the metal baffle piece, so that the pressing plate, the panel and the baffle plate form a cover body covering the outside of the observation window, preventing collision and scratching of the transparent glass when not in use, solving the problem that the glass is always exposed outside and is easy to be collided and scratched when the observation window is not used, and reducing the service life of the transparent glass. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a three-dimensional structure schematic view of the utility model;

[0027] Figure 2 It is a partially exploded structure schematic view in the utility model;

[0028] Figure 3 It is a three-dimensional structure schematic view of the pressing plate of the utility model;

[0029] Figure 4 It is a sectional view of the panel in the utility model;

[0030] Figure 5 It is a sectional view of the pressing plate in the utility model;

[0031] Figure 6 It is a three-dimensional structure schematic view of the ratchet wheel in the utility model.

[0032] In the figure: 1, panel; 2, pressing plate; 3, metal baffle; 4, reset knob plug; 5, first sliding groove; 6, protrusion; 7, second sliding groove; 8, third sliding groove; 9, rack; 10, gear; 11, ratchet; 12, connecting shaft; 13, stop block; 14, elastic member; 15, control ring; 16, auxiliary lens; 17, clamping sleeve. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] As Figures 1-6 shown, the utility model provides a technical scheme: a single crystal furnace main observation port baffle structure, including the pressing plate 2 that can be dismantled connection in the single crystal furnace observation port, the side that can dismantle of pressing plate 2 away from single crystal furnace connects with annular panel 1, the side that pressing plate 2 is close to panel 1 is equipped with first sliding groove 5, and still be provided with metal baffle 3 between pressing plate 2 and panel 1, the both sides of metal baffle 3 are slidably connected in first sliding groove 5, to make metal baffle 3 be located single crystal furnace observation port outside and slide up and down, play the role of switching observation state, panel 1 still is equipped with locking assembly, and one end of locking assembly is inserted with one side of metal baffle 3, for fixing the position of metal baffle 3, in use, panel 1 can be rectangular, and the middle part is provided with the opening as annular, it is convenient for the middle part of panel 1 to observe the state in single crystal furnace, the number of pressing plate 2 is two, and two pressing plates 2 are symmetrically installed on the outside of single crystal furnace observation port, can be fixed through screw or clamping mode, then further adhere metal baffle 3 on pressing plate 2, and then fix metal baffle 3 through panel 1, make metal baffle 3 slide up and down along first sliding groove 5 between panel 1 and pressing plate 2, realize the observation window of opening or closing single crystal furnace, metal baffle 3 can adopt stainless steel material simultaneously, when not using observation window, slide down metal baffle 3 along first sliding groove 5, close the opening in the middle part of panel 1, thereby the transparent glass on the side of single crystal furnace observation window of panel 1 is shielded, avoid causing scratch and collision to transparent glass, then slide up and down metal baffle 3 to open or close observation state, so that the plated glass installed on observation window can replace transparent glass to save cost.

[0035] The bottom of the metal baffle 3 is provided with two protrusions 6, and the side of the protrusion 6 away from the panel 1 is in sliding connection with the first sliding groove 5; the distance between the top of the two first sliding grooves 5 away from each other is less than the distance between the bottom of the two first sliding grooves 5 away from each other, and the distance between the two protrusions 6 connected with the metal baffle 3 is the same as the distance between the top of the two first sliding grooves 5 away from each other; in use, the protrusion 6 extends to the inside of the first sliding groove 5, and the protrusion 6 is limited by the narrow side of the first sliding groove 5 above, preventing the metal baffle 3 from separating from the first sliding groove 5.

[0036] The top between the two pressing plates 2 is provided with a horizontal plate, and the side close to the single crystal furnace of the horizontal plate, the panel 1 and the pressing plate 2 is provided with a heat insulation pad; in use, the heat insulation pad can be made of high temperature resistant heat insulation rubber material, reducing the influence of high temperature at the observation port on the metal baffle 3 and the panel 1, avoiding burns to the workers.

[0037] The locking assembly includes a positioning hole opened on the metal baffle 3 and a reset knob plug 4 installed on the panel 1; one end of the reset knob plug 4 penetrates the panel 1, and the end of the reset knob plug 4 penetrating the panel 1 penetrates the positioning hole, used for locking the metal baffle 3; in use, the reset knob plug 4 can be formed by a circular rod, and the contact part of the circular rod with the panel 1 is provided with a corresponding thread, by rotating the circular rod forward and reverse, the thickness of the circular rod is changed, realizing the locking or releasing of the metal baffle 3; the reset knob plug 4 can also be composed of a spring and a control rod, and a circular cylinder is externally sleeved, the circular cylinder is fixed on the panel 1, and the control rod penetrates the panel 1 and the positioning hole under the pushing force of the spring, realizing the locking and fixing of the metal baffle 3, and when released, the metal baffle 3 can move up and down freely by pulling the control rod to overcome the spring away from the metal baffle 3.

[0038] The bottom of the metal baffle 3 is provided with a connecting assembly, and the bottom of the connecting assembly is detachably connected with an auxiliary lens 16, and the width of the auxiliary lens 16 is the same as the visible width of the middle of the panel 1, so that when observing in hot state, the auxiliary lens 16 is moved to the visible window of the panel 1 by the metal baffle 3; in use, when the internal state needs to be observed in hot state, select the appropriate auxiliary lens 16 to be installed below the metal baffle 3, and then pull the metal baffle 3 upwards, so that the metal baffle 3 moves the auxiliary lens 16 to the upper side, and the workers observe the state of the furnace in hot state through the auxiliary lens 16, and when observing in cold state, the auxiliary lens 16 is removed below the metal baffle 3, and the workers directly observe through the glass on the observation window, so as to observe the state of the furnace in different running states.

[0039] The connecting assembly comprises a T-shaped protrusion and a T-shaped clamping groove formed below the metal blocking sheet 3, the outer side of the T-shaped protrusion is clamped with the inner wall of the T-shaped clamping groove, the bottom of the T-shaped protrusion is fixedly connected with a clamping sleeve 17, the inner side of the clamping sleeve 17 is clamped with the outer side of the auxiliary lens 16; the panel 1 is provided with a third sliding groove 8, the top and bottom of the third sliding groove 8 are communicated with the lower side of the panel 1 and the middle of the panel 1 respectively, the thickness of the third sliding groove 8 is twice the thickness of the clamping sleeve 17, and the thickness of the clamping sleeve 17 is the same as the thickness of the metal blocking sheet 3; in use, the clamping sleeve 17 is inserted upward from the lower side of the third sliding groove 8, and after the clamping sleeve 17 is lifted to a proper height, it is horizontally moved, so that the T-shaped structure on the clamping sleeve 17 is horizontally inserted into the T-shaped clamping groove and clamped with the T-shaped clamping groove, so that the metal blocking sheet 3 pulls the clamping sleeve 17 upward to move, and drives the auxiliary lens 16 to be lifted, and different auxiliary lenses 16 are installed according to different growth stages, so that the state in the furnace in different states can be observed.

[0040] The metal blocking sheet 3 is further provided with a limiting assembly for preventing the metal blocking sheet 3 from sliding down in the lifting process; the limiting assembly comprises a connecting shaft 12 rotatably connected to the pressing plate 2, one end of the connecting shaft 12 close to the panel 1 is connected to the metal blocking sheet 3 through a connecting structure, so that the metal blocking sheet 3 drives the connecting shaft 12 to rotate in the upward and downward movement; the other end of the connecting shaft 12 is connected with a control structure for controlling the one-way rotation or bidirectional rotation of the connecting shaft 12, so that when the observation window is opened, the metal blocking sheet 3 is prevented from falling downward in the movement through the one-way rotation of the connecting shaft 12; in use, the one-way rotation of the connecting shaft 12 is opened, and then the metal blocking sheet 3 is pulled upward, the metal blocking sheet 3 drives the connecting shaft 12 to rotate through the connecting structure, and since the connecting shaft 12 can only rotate in one direction, when the metal blocking sheet 3 accidentally falls downward in the observation or lifting process, the connecting shaft 12 is locked through the control structure, the rotation of the connecting shaft 12 is limited, and then the metal blocking sheet 3 is locked, so that the metal blocking sheet 3 is prevented from falling downward.

[0041] The connecting structure comprises a second sliding groove 7 formed in the pressing plate 2, the bottom of the second sliding groove 7 is communicated with the first sliding groove 5, and a rack 9 is slidably connected in the second sliding groove 7, and the bottom of the rack 9 is connected with the top of the protrusion 6; one end of the connecting shaft 12 extends into the second sliding groove 7, and a gear 10 is fixedly connected to one end of the connecting shaft 12 in the second sliding groove 7, and the gears 10 in the second sliding groove 7 are respectively meshed with the corresponding racks 9 on the side close to each other; in use, the protrusion 6 and the rack 9 are detachably connected, such as T-shaped anti-falling groove, screw and the like; the upward and downward movement of the protrusion 6 is driven by the metal blocking sheet 3, so that the protrusion 6 pushes the rack 9 upward or pulls the rack 9 downward, the gear teeth part of the rack 9 drives the gear 10 to rotate in opposite directions, and then drives the connecting shaft 12 to rotate, through the rotation of the gears 10 on both sides, and the limitation of the rack 9 and the gear 10 to the metal blocking sheet 3, the stability of the upward and downward sliding of the metal blocking sheet 3 is improved.

[0042] The control structure comprises a chamber opened on one side of the pressing plate 2, the connecting shaft 12 extends to the inside of the chamber at the end away from the gear 10, the end of the connecting shaft 12 in the chamber is fixedly connected with the ratchet wheel 11, the ratchet wheel 11 is slidably connected with the stop block 13 on one side, the outer side of the stop block 13 is provided with a reset assembly for pushing the stop block 13 to extrude on the surface of the ratchet wheel 11; the outer side of the ratchet wheel 11 is provided with a plurality of first inclined surfaces and second inclined surfaces, the length of the first inclined surface is greater than that of the second inclined surface, and the included angle between the first inclined surface close to one side of the middle part of the ratchet wheel 11 and the connecting part of the second inclined surface close to the middle part of the ratchet wheel 11 is ninety degrees.

[0043] In use, the number of control structures is one, which is arranged on one of the pressing plates 2 and connected with one of the connecting shafts 12 for control, counterclockwise rotation, the first first inclined surface close to one side of the middle part of the ratchet wheel 11 is connected with the first second inclined surface close to one side of the middle part of the ratchet wheel 11, the first second inclined surface away from the middle part of the ratchet wheel 11 is connected with the second first inclined surface away from the middle part of the ratchet wheel 11, and so on, the last second inclined surface away from the middle part of the ratchet wheel 11 is connected with the first first inclined surface away from the middle part of the ratchet wheel 11, in the process of rising of the metal baffle 3, the stop block 13 is pushed by the first inclined surface to extrude the reset assembly, so that the end of the stop block 13 moves from the first inclined surface close to one side of the middle part of the ratchet wheel 11 to the first inclined surface away from the middle part of the ratchet wheel 11, and then falls on the other first inclined surface, and so on, so as to make the connecting shaft 12 continuously rotate, when the metal baffle 3 falls off and falls down, the stop block 13 moves on the first inclined surface to the side close to the middle part of the ratchet wheel 11, so that the connecting part of the second inclined surface and the first inclined surface away from the middle part of the ratchet wheel 11 abuts against the side surface of the stop block 13, the rotation of the ratchet wheel 11 is limited, and then the connecting shaft 12 is locked to prevent the metal baffle 3 from falling accidentally, and at the same time, the metal baffle 3 is observed in a hot state, so as to stop the metal baffle 3 at any height, and the position of the metal baffle 3 is adjusted according to the field of vision and light requirement, so as to reduce the interference to the inside of the single crystal furnace.

[0044] The reset assembly comprises an elastic member 14, one end of the elastic member 14 is fixedly connected with the inner wall of the chamber, the other end of the elastic member 14 is provided with a control ring 15, the control ring 15 is sleeved on the outside of the ratchet wheel 11, the inner side of the control ring 15 is connected with the side of the stop block 13 away from the ratchet wheel 11; the outer side of the control ring 15 is provided with a control rod, the control rod extends to the outside of the pressing plate 2 through one side of the chamber; in use, the elastic member 14 can adopt a spring for pushing the control ring 15 to drive the stop block 13 to move, the distance between the control ring 15 and the ratchet wheel 11 is adapted to the height of the stop block 13 and the second inclined surface, so as to push the control rod to drive the control ring 15 to move when it is needed to move the metal baffle 3 downward, the control ring 15 drives the stop block 13 to separate from the ratchet wheel 11, and then the ratchet wheel 11 is freely rotated to reset the metal baffle 3.

Claims

1. A baffle structure for the main observation port of a single crystal furnace, characterized in that: The utility model relates to a single crystal furnace observation port plate, including the detachable connection of the pressing plate (2) at single crystal furnace observation port, the detachable connection of annular panel (1) far away from single crystal furnace side of pressing plate (2), the first sliding slot (5) of being set up in the side of pressing plate (2) close to panel (1), and still be provided with metal baffle (3) between pressing plate (2) with panel (1), the both sides of metal baffle (3) are connected in the first sliding slot (5) sliding, to make metal baffle (3) be located on the outside of single crystal furnace observation port and slide up and down, play the role of switching observation state; Panel (1) still is provided with locking assembly, one end of locking assembly is inserted with one side of metal baffle (3), for the position fixed of metal baffle (3).

2. The main view port shutter structure of a single crystal furnace according to claim 1, characterized in that: The both sides of the bottom of metal baffle (3) are provided with protrusions (6), and the side away from panel (1) of protrusion (6) is connected with the first sliding slot (5) slidingly. The distance between the side faces of the two first sliding slots (5) away from each other at the top is less than the distance between the side faces of the two first sliding slots (5) away from each other at the bottom, and the distance between the two protrusions (6) and the metal baffle (3) is the same as the distance between the side faces of the two first sliding slots (5) away from each other at the top.

3. The main view port shutter structure of a single crystal furnace according to claim 1, characterized in that: The locking assembly comprises a positioning hole formed on the metal baffle (3) and a reset knob plug (4) installed on the panel (1). One end of the reset knob plug (4) penetrates the panel (1), and the end of the reset knob plug (4) penetrating the panel (1) penetrates the positioning hole, for locking the metal baffle (3).

4. The main view port shutter structure of a single crystal furnace according to claim 1, characterized in that: The bottom of the connecting assembly is detachably connected with an auxiliary lens (16), and the width of the auxiliary lens (16) is the same as the visible width of the middle of the panel (1), so that when observing in a hot state, the auxiliary lens (16) is moved to the visible window of the panel (1) through the metal baffle (3).

5. The main view port shutter structure of a single crystal furnace according to claim 4, characterized in that: The connecting assembly comprises a T-shaped protrusion and a T-shaped clamping groove formed below the metal baffle (3), the outer side of the T-shaped protrusion is clamped with the inner wall of the T-shaped clamping groove, the bottom of the T-shaped protrusion is fixedly connected with a clamping sleeve (17), and the inner side of the clamping sleeve (17) is clamped with the outer side of the auxiliary lens (16). The panel (1) is provided with a third sliding slot (8), the top and bottom of the third sliding slot (8) are communicated with the lower part of the panel (1) and the middle part of the panel (1) respectively, the thickness of the third sliding slot (8) is twice the thickness of the clamping sleeve (17), and the thickness of the clamping sleeve (17) is the same as the thickness of the metal baffle (3).

6. The main view port shutter structure of a single crystal furnace according to claim 1, characterized in that: The metal baffle (3) is further provided with a limiting assembly for preventing the metal baffle (3) from sliding down in the rising process. The limiting assembly comprises a connecting shaft (12) rotatably connected to the pressing plate (2), and one end of the connecting shaft (12) close to the panel (1) is connected to the metal baffle (3) through a connecting structure, so that the connecting shaft (12) is driven to rotate in the up-down movement of the metal baffle (3). The other end of the connecting shaft (12) is connected with a control structure for controlling the one-way rotation or bidirectional rotation of the connecting shaft (12) so that the metal blocking piece (3) is prevented from falling down in movement when the observation window is opened.

7. The main view port shutter structure of a single crystal furnace according to claim 6, characterized in that: The connecting structure comprises a second sliding groove (7) formed in the pressing plate (2), the bottom of the second sliding groove (7) is communicated with the first sliding groove (5), the inside of the second sliding groove (7) is slidably connected with a rack (9), the bottom of the rack (9) is connected with the top of the protrusion (6); One end of the connecting shaft (12) extends to the inside of the second sliding groove (7), one end of the connecting shaft (12) inside the second sliding groove (7) is fixedly connected with a gear (10), the gear (10) inside the second sliding groove (7) is meshingly connected with the rack (9) on the side close to each other.

8. The single crystal furnace main sight port shutter structure according to claim 6, characterized by: The control structure comprises a cavity formed in one side of the pressing plate (2), one end of the connecting shaft (12) away from the gear (10) extends to the inside of the cavity, one end of the connecting shaft (12) inside the cavity is fixedly connected with a ratchet wheel (11), one side of the ratchet wheel (11) is slidably connected with a blocking piece (13), the outside of the blocking piece (13) is provided with a reset assembly for pushing the blocking piece (13) to extrude on the surface of the ratchet wheel (11); The outside of the ratchet wheel (11) is provided with a plurality of first inclined surfaces and second inclined surfaces, the length of the first inclined surface is greater than the length of the second inclined surface, and the included angle between the first inclined surface close to one side of the middle part of the ratchet wheel (11) and the connection part of the second inclined surface close to the middle part of the ratchet wheel (11) is ninety degrees.

9. The single crystal furnace main sight port shutter structure according to claim 8, characterized by: The reset assembly comprises an elastic member (14), one end of the elastic member (14) is fixedly connected with the inner wall of the cavity, the other end of the elastic member (14) is provided with a control ring (15), the control ring (15) is sleeved on the outside of the ratchet wheel (11), the inside of the control ring (15) is connected with the side of the blocking piece (13) away from the ratchet wheel (11); The outside of the control ring (15) is provided with a control rod, the control rod extends to the outside of the pressing plate (2) through one side of the cavity.

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