A temperature measuring device for aluminum alloy round ingot

Abstract

The application relates to the technical field of aluminum alloy processing, in particular to an aluminum alloy round ingot temperature measuring device, which comprises a mounting frame, air cylinders and an auxiliary plate. Two groups of air cylinders are arranged at the top of the mounting frame. The bottom ends of the air cylinders are connected with lifting plates. The lifting plates are lifted and adjusted through the air cylinders. Two groups of pushers capable of moving oppositely are arranged at the bottom of the lifting plates. Thermocouples are arranged at the bottom ends of the pushers to detect temperature. The two groups of pushers are driven to move oppositely by the air cylinders to stably detect the ingot. The design can avoid manual temperature measurement, improve safety, conveniently measure the temperature of the ingot with different lengths at multiple points, improve efficiency, and lower the lifting plate and the thermocouple arranged at the bottom end to measure the temperature through the air cylinder. The design can vertically measure the temperature of the ingot, save temperature measurement time, and improve efficiency.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy processing technology, specifically to a temperature measuring device for aluminum alloy round ingots. Background Technology

[0002] Aluminum alloy tubing, due to its low density, good corrosion resistance, and easy processing, is widely used in automotive heat exchange systems, residential air conditioning systems, and other fields. Aluminum alloy processing includes various processes such as extrusion, rolling, and casting. Aluminum alloy extrusion, due to its high product performance and ability to produce products with complex cross-sectional structures, is widely used in aluminum alloy processing. Hot extrusion of aluminum alloys involves placing a heated aluminum alloy round ingot into an extrusion cylinder, and then passing it through a die under the action of an extrusion rod to obtain the desired shape. Historical research shows that the temperature and its gradient of the aluminum alloy round ingot have a significant impact on the performance of the extruded products.

[0003] For example, CN102500675B discloses a thermoforming fixture for thin-walled titanium alloy parts, comprising five main parts: a stretching device, a die assembly, a blank, a power supply system, and a temperature control system. The die assembly is placed on the central worktable of the stretching device. The blank is passed through the side wall gap of the die assembly. An insulating heat-insulating pad is used to insulate the blank from the stretching device clamps, the die surface, and the fixture. The power supply system is turned on, energizing the electrode clamps to generate current within the blank, heating it. The temperature control system measures and controls the blank temperature. Once the blank reaches the target temperature, it is thermoformed on the stretching device through stretching-coating-stretching-insulating creep and other thermoforming processes to form the part by bonding the blank to the die surface. This invention provides a processing method for thermoforming fixtures for thin-walled titanium alloy parts, comprising eight steps. This invention significantly improves the heating efficiency, process integration, material formability, and forming accuracy in the manufacturing of thin-walled titanium alloy parts, possessing practical and promotional value.

[0004] While existing temperature measuring devices can meet the requirements, they have the following drawbacks: Because aluminum alloy round ingots produce a thick oxide scale during the casting process, temperature measurement is typically done manually using an insertion thermometer. In actual extrusion, the bar stock temperature is high, posing a significant risk to the temperature measurement operator. Furthermore, multiple measurements are required, which is time-consuming and impacts production efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a temperature measuring device for aluminum alloy round ingots, addressing the shortcomings of existing temperature measuring devices described in the background section. While these devices meet the temperature measurement requirements, they suffer from the following drawbacks: A thick oxide scale is generated during the casting process of aluminum alloy round ingots, necessitating manual measurement using an insertion thermometer. Furthermore, the high temperature of the ingot during actual extrusion poses a significant risk to the temperature measuring operator, requires multiple measurements, and is time-consuming, thus impacting production efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a temperature measuring device for aluminum alloy round ingots, comprising a mounting frame, cylinders, and an auxiliary plate. Two sets of cylinders are installed on both sides of the top of the mounting frame. A lifting plate is connected to the bottom of the cylinders. The lifting plate is adjusted in height by being pushed by the cylinders. Two sets of relatively movable pushing members are installed on the bottom side of the lifting plate. A thermocouple is installed at the bottom of the pushing member to detect the temperature.

[0007] Preferably, two sets of auxiliary rods are installed on both sides of the front end of the mounting frame, and an auxiliary plate is fixed on the upper center of the four sets of auxiliary rods. The lifting plate slides within the four sets of auxiliary rods. Two sets of temperature measuring instruments are installed at the front end of the mounting frame, and the two sets of temperature measuring instruments are electrically connected to the thermocouple on the bottom side. A driving component is installed on the right center of the mounting frame.

[0008] Preferably, a rear fixing plate is installed at the rear end of the mounting bracket, and a rack plate is fixed at the bottom front end of the mounting bracket.

[0009] Preferably, the driving component includes an upper fixed bearing and an upper rotating shaft. The upper fixed bearing is installed on the right side of the center of the mounting bracket and the auxiliary plate. The upper rotating shaft is located at the center of the upper fixed bearing and rotates. A servo motor is provided at the top of the upper rotating shaft for driving. An upper cross-shaped fixing plate is fixed to the bottom side of the upper rotating shaft.

[0010] Preferably, the lifting plate, the rotating component, and the pushing component constitute a moving mechanism. A rotating component is installed on the right side of the center of the lifting plate. The rotating component is perpendicular to the driving component. Side blocks are provided on both sides of the bottom end of the lifting plate. A lead screw is threaded into the center of the two sets of side blocks. A one-way gear is fixed in the center of the lead screw. A transverse bevel gear is provided on the right side of the one-way gear. The top of the transverse bevel gear meshes with the rotating component to rotate.

[0011] Preferably, a slide rail is fixedly provided on the front side of the bottom end of the lifting plate, and two sets of through holes are opened on each side of the lifting plate, with an auxiliary rod passing through the through holes.

[0012] Preferably, the rotating component includes a lower fixed bearing and a lower rotating shaft. The lower fixed bearing is installed on the right side of the lifting plate. The lower fixed bearing has a rotating lower shaft at its center. A vertical bevel gear is fixed at the bottom end of the lower rotating shaft. The vertical bevel gear meshes with a horizontal bevel gear. A lower cross plate is fixed at the top end of the lower rotating shaft. The centers of the lower cross plates are not connected to each other. The lower cross plate can be perpendicularly and staggered with the upper cross plate.

[0013] Preferably, the pushing component includes a wire drum and a limiting plate. The wire drum moves within the lead screw. Two sets of limiting plates are provided at the front end of the wire drum. A mounting post is provided at the center of the two sets of limiting plates. A slider is fixed at the top of the mounting post and slides within a slide rail. A mounting plate is fixed at the bottom end of the mounting post.

[0014] Preferably, the rear end of the one-way gear rises to engage with a rack plate for rotation. The one-way gear comprises an internal gear and an external gear. The internal gear is mounted at the center of a lead screw. Both ends of the internal gear are provided with limit bearings. Both sets of limit bearings are fixed at the center of the lead screw. Multiple sets of connecting rods are provided on the side of the limit bearings and fixed to the inner wall of the external gear. Multiple sets of limit teeth are fixed around the inner wall of the external gear. The multiple sets of limit teeth can limit the internal gear to rotate in one direction.

[0015] Preferably, the limiting tooth includes a U-shaped block and a fixing plate. The bottom two sides of the U-shaped block are at different heights. The U-shaped block is connected to the front and back of the interior by fixing plates. A rotating column is fixed at the center of the two sets of fixing plates. A rotating plate is provided at the center of the rotating column for slight rotation. The rotating plate is connected to the shorter side of the bottom of the U-shaped block by a spring. The longer side of the bottom of the U-shaped block does not obstruct the rotation of the internal gear. The bottom of the rotating plate extends into the tooth gap of the internal gear.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By setting a one-way gear, the cylinder pushes the lifting plate down and rotates, thereby driving the lead screw to rotate. Only the continuous lifting and lowering of the cylinder is needed to drive the two sets of pushing parts to move the thermocouples relative to each other for stable ingot temperature detection. This design avoids manual temperature measurement and improves safety. At the same time, it facilitates multi-point temperature measurement of ingots of different lengths and improves efficiency. The cylinder pushes the lifting plate at the bottom and the installed thermocouples to descend for temperature measurement. This design can measure the temperature of the ingot vertically, saving temperature measurement time and improving efficiency.

[0018] 2. When the lifting plate is raised to the top by the cylinder, the rotating and driving components are connected in an alternating manner. The servo motor in the driving component drives the lead screw on the bottom side to rotate in the opposite direction, thereby driving the two sets of pushing components and thermocouples back to their original positions for easy and stable measurement in the next step. This improves the stability of single ingot measurement. The thermocouples can be quickly disassembled and installed by the mounting plate at the bottom of the mounting column, which facilitates subsequent maintenance and improves the applicability of the device.

[0019] 3. By setting the internal and external gears to be connected by the limiting teeth, the lead screw can be driven to rotate in one direction, thereby avoiding the jerking sensation caused by the cylinder operation and improving the applicability of the device. This design is beneficial to the non-interference between thermocouple detection and reset, and further enables effective temperature detection of ingots of different sizes. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a front view schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a side view of the structure of the present invention;

[0023] Figure 3 This is a schematic diagram of the mounting frame structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the driving component structure of the present invention;

[0025] Figure 5 This is a bottom view of the moving mechanism structure of the present invention;

[0026] Figure 6 This is a side sectional view of the rotating component structure of the present invention;

[0027] Figure 7 This is an enlarged schematic diagram of the pusher structure of the present invention;

[0028] Figure 8 This is an enlarged schematic diagram of the one-way gear structure of the present invention;

[0029] Figure 9 This is a partially enlarged schematic diagram of the internal structure of the one-way gear of the present invention.

[0030] In the diagram: 1. Mounting bracket; 11. Rear mounting plate; 12. Rack plate; 2. Auxiliary rod; 3. Cylinder; 4. Auxiliary plate; 5. Temperature measuring instrument; 6. Drive component; 61. Upper fixed bearing; 62. Upper rotating shaft; 63. Servo motor; 64. Upper cross mounting plate; 7. Moving mechanism; 71. Lifting plate; 711. Slide rail; 712. Through hole; 72. Rotating component; 721. Lower fixed bearing; 722. Lower rotating shaft; 723. Lower cross mounting plate; 724. Vertical bevel gear; 7 3. Side block; 74. Lead screw; 75. Pushing component; 751. Screw; 752. Limiting plate; 753. Mounting column; 754. Slider; 755. Mounting plate; 76. One-way gear; 761. Internal gear; 762. Limiting bearing; 763. Connecting rod; 764. External gear; 765. Limiting tooth; 7651. U-shaped block; 7652. Fixing plate; 7653. Rotating column; 7654. Rotating plate; 7655. Spring; 77. Transverse bevel gear; 8. Thermocouple. Detailed Implementation

[0031] 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.

[0032] Please see Figures 1-9 An embodiment of the present invention provides a temperature measuring device for aluminum alloy round ingots, comprising a mounting frame 1, a cylinder 3, and an auxiliary plate 4. Two sets of cylinders 3 are installed on both sides of the top of the mounting frame 1. The bottom of the cylinders 3 is connected to a lifting plate 71, which is adjusted by the cylinders 3. Two sets of relatively movable pushers 75 are installed on the bottom side of the lifting plate 71. Thermocouples 8 are installed at the bottom of the pushers 75 for temperature detection. A rear fixing plate 11 is installed at the rear end of the mounting frame 1, and a rack plate 12 is fixed on the bottom side of the front end of the mounting frame 1.

[0033] Furthermore, two sets of auxiliary rods 2 are installed on both sides of the front end of the mounting frame 1. An auxiliary plate 4 is fixed on the upper center of the four sets of auxiliary rods 2. The lifting plate 71 slides within the four sets of auxiliary rods 2. Two sets of temperature measuring instruments 5 are installed at the front end of the mounting frame 1. The two sets of temperature measuring instruments 5 are electrically connected to the thermocouple 8 on the bottom side. A driving component 6 is installed on the right center of the mounting frame 1 to perform multi-point temperature detection on the aluminum alloy ingot.

[0034] As a further aspect of the invention, the driving component 6 includes an upper fixed bearing 61 and an upper rotating shaft 62. The upper fixed bearing 61 is installed on the right side of the center of the mounting bracket 1 and the auxiliary plate 4. The upper rotating shaft 62 is located at the center of the upper fixed bearing 61 and rotates. A servo motor 63 is installed at the top of the upper rotating shaft 62 for driving. An upper cross plate 64 is fixedly installed on the bottom side of the upper rotating shaft 62. The rotating component 72 includes a lower fixed bearing 721 and a lower rotating shaft 722. The lower fixed bearing 721 is installed on the right side of the lifting plate 71. The lower rotating shaft 722 is located at the center of the lower fixed bearing 721 and rotates. A vertical bevel gear 724 is fixedly installed at the bottom of the lower rotating shaft 722. The vertical bevel gear 724 meshes with a horizontal bevel gear 77. A lower cross plate 723 is fixedly installed at the top of the lower rotating shaft 722. The centers of the lower cross plates 723 are not connected to each other. The lower cross plates 723 can be perpendicularly and staggered with the upper cross plate 64 to facilitate the driving push component to drive the thermocouple to return to its original position in preparation for the next temperature measurement.

[0035] As a further improvement of the present invention, the lifting plate 71, the rotating component 72, and the pushing component 75 constitute the moving mechanism 7. The rotating component 72 is installed on the right side of the center of the lifting plate 71. The rotating component 72 is perpendicular to the driving component 6. Side blocks 73 are provided on both sides of the bottom end of the lifting plate 71. A lead screw 74 is threaded into the center of the two sets of side blocks 73. A one-way gear 76 is fixed in the center of the lead screw 74. A transverse bevel gear 77 is provided on the right side of the one-way gear 76. The top of the transverse bevel gear 77 meshes with the rotating component 72 to rotate, thereby realizing rapid and efficient temperature measurement of aluminum alloy ingots and improving usability.

[0036] Furthermore, a slide rail 711 is fixedly installed on the front side of the bottom end of the lifting plate 71, and two sets of through holes 712 are opened on both sides of the lifting plate 71. An auxiliary rod 2 passes through the through hole 712 to improve the lifting stability of the device.

[0037] Furthermore, the pusher 75 includes a wire drum 751 and a limiting plate 752. The wire drum 751 moves within the lead screw 74. Two sets of limiting plates 752 are provided at the front end of the wire drum 751. A mounting post 753 is provided at the center of the two sets of limiting plates 752. A slider 754 is fixedly provided at the top of the mounting post 753. The slider 754 slides within the slide rail 711. A mounting plate 755 is fixedly provided at the bottom end of the mounting post 753, which facilitates the movement and detection of the thermocouple and improves measurement efficiency.

[0038] As a further improvement of the present invention, the rear end of the one-way gear 76 can rise to engage with the rack plate 12 for rotation. The one-way gear 76 comprises an internal gear 761 and an external gear 764. The internal gear 761 is mounted at the center of the lead screw 74. Both ends of the internal gear 761 are provided with limit bearings 762. Both sets of limit bearings 762 are fixed at the center of the lead screw 74. Multiple sets of connecting rods 763 are provided on the sides of the limit bearings 762 and fixed to the inner wall of the external gear 764. Multiple sets of limit teeth 765 are fixed around the inner wall of the external gear 764. The multiple sets of limit teeth 765 can limit the one-way rotation of the internal gear 761. The limit teeth 765 include a U-shaped block 7651 and a fixing plate 7652. The bottom sides of the U-shaped block 7651 are at different heights. The interior of the U-shaped block 7651 is connected by fixing plates 7652 at both the front and back. A rotating column 7653 is fixed in the center of the two sets of fixing plates 7652. A rotating plate 7654 is located in the center of the rotating column 7653 for slight rotation. The rotating plate 7654 is connected to the shorter side of the bottom of the U-shaped block 7651 by a spring 7655. The longer side of the bottom of the U-shaped block 7651 does not obstruct the rotation of the internal gear 761. The bottom of the rotating plate 7654 extends into the tooth gap of the internal gear 761, which is beneficial to the non-interference between thermocouple detection and reset, and further enables effective temperature detection of ingots of different sizes.

[0039] Working principle: During operation, when temperature detection of the ingot is required, only two sets of cylinders 3 need to be activated to simultaneously push the bottom lifting plate 71 to descend. The lifting plate 71 descends smoothly through four sets of auxiliary rods 2 on both sides. When the lifting plate 71 descends to the designated position, the thermocouples 8 installed on the bottom mounting plates 755 of the two sets of mounting columns 753 stably detect the surface of the ingot. The thermocouples 8 transmit the detected temperature to the temperature measuring instrument 5 at the top for observation of the ingot temperature. When taking multiple measurements on ingots of different lengths, only the cylinders 3 need to be activated to raise the bottom lifting plate 71 by half a distance. When the lifting plate 71 rises, the external gear 764 in the one-way gear 76 at the center of the bottom lead screw 74 meshes with the rack plate 12 on the rear side and rotates. When meshing and rotating, the multiple sets of limiting teeth 765 on the inner wall can rotate synchronously. The rotating plate 7654 inside the U-shaped block 7651 in the limiting teeth 765 can rotate and abut against the tooth gap in the internal gear 761. The rotating plate 7654 is limited by the longer side of the bottom end of the U-shaped block 7651 and cannot rotate, so it can mesh with the internal gear 761 and rotate. The rotation of the internal gear 761 can drive the lead screw 74 to rotate. The rotation of the lead screw 74 can drive the lead cylinders 751 on both sides to move to the same distance. The two sets of limiting plates 752 fixed at the front end of the lead cylinder 751 can drive the mounting column 753 to move. The mounting column 753 moves in the slide rail 711 through the slider 754 at the top end. When the mounting column 753 moves, it can drive the thermocouple 8 installed at the bottom end to move.

[0040] Once the positions of the two sets of thermocouples 8 are adjusted, the cylinder 3 can be activated to lower the temperature. When the lifting plate 71 lowers, the external gear 764 meshes with the rack plate 12. When the rotating plate 7654 in the internal limit tooth 765 rotates in the opposite direction against the internal gear 761, it does not resist the internal gear 761 to rotate. Only the external gear 764 and the installed connecting rod 763 drive the limit bearing 762 to rotate in the lead screw 74. After the lifting plate 71 lowers, it can drive the thermocouples 8 to continue to detect the temperature.

[0041] After the ingot inspection is completed, simply start cylinder 3 to raise the lifting plate 71 to its highest position. When the lifting plate 71 rises, it drives the lower rotating shaft 722 on the right side of the center and the fixed lower cross plate 723 to interlock with the upper cross plate 64 on the bottom side of the upper rotating shaft 62 at the top. Then, power on the servo motor 63 to drive the upper rotating shaft 62 to rotate. The rotation of the upper rotating shaft 62 drives the lower rotating shaft 722 to rotate through the interlocking rotation of the upper cross plate 64 and the lower cross plate 723. The rotation of the lower rotating shaft 722 drives the vertical bevel gear 724 on the bottom side to rotate. The rotation of the vertical bevel gear 724 meshes with the horizontal bevel gear 77 to rotate. The rotation of the horizontal bevel gear 77 drives the lead screw 74 to rotate in the opposite direction. The reverse rotation of the lead screw 74 drives the two sets of thermocouples 8 to return to their original positions. The operation ends here.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Those skilled in the art can readily implement the present invention based on the accompanying drawings and the above description. However, any modifications, alterations, or variations made by those skilled in the art without departing from the scope of the present invention, utilizing the disclosed technical content, are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, or variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A temperature measuring device for aluminum alloy round ingots, comprising a mounting frame (1), a cylinder (3), and an auxiliary plate (4), characterized in that: Two sets of cylinders (3) are installed on both sides of the top of the mounting bracket (1). The bottom of the cylinders (3) is connected to the lifting plate (71). The lifting plate (71) is adjusted by the cylinders (3). Two sets of relatively movable pushers (75) are installed on the bottom side of the lifting plate (71). The lifting plate (71), the rotating part (72) and the pusher (75) form a moving mechanism (7). The rotating part (72) is installed on the right side of the center of the lifting plate (71). The rotating part (72) is perpendicular to the driving part (6). Both sides of the bottom of the lifting plate (71) have high-speed side edges. Block (73), the center of the two sets of side blocks (73) is threaded with a lead screw (74), the center of the lead screw (74) is fixed with a one-way gear (76), the right side of the one-way gear (76) is provided with a transverse bevel gear (77), the top of the transverse bevel gear (77) meshes with a rotating component (72) to rotate, the bottom front side of the lifting plate (71) is fixed with a slide rail (711), the sides of the lifting plate (71) are each open with two sets of through holes (712), the through holes (712) are filled with an auxiliary rod (2), the rotating component (72) includes a lower fixed bearing (72). 1) and a lower rotating shaft (722), the lower fixed bearing (721) is installed on the right side of the lifting plate (71), the lower fixed bearing (721) has a lower rotating shaft (722) at its center for rotation, the lower rotating shaft (722) has a vertical bevel gear (724) fixed at its bottom end, the vertical bevel gear (724) meshes with a horizontal bevel gear (77), the lower rotating shaft (722) has a lower cross plate (723) fixed at its top end, the lower cross plates (723) are not connected at their centers, the lower cross plate (723) can be perpendicularly and staggered with the upper cross plate (64) The pusher (75) includes a wire drum (751) and a limiting plate (752). The wire drum (751) moves within the lead screw (74). Two sets of limiting plates (752) are provided at the front end of the wire drum (751). A mounting post (753) is provided at the center of the two sets of limiting plates (752). A slider (754) is fixed at the top of the mounting post (753). The slider (754) slides within the slide rail (711). A mounting plate (755) is fixed at the bottom end of the mounting post (753). A thermocouple (8) is installed at the bottom end of the pusher (75) to detect the temperature.

2. The aluminum alloy round ingot temperature measuring device according to claim 1, characterized in that: Two sets of auxiliary rods (2) are installed on both sides of the front end of the mounting frame (1). An auxiliary plate (4) is fixed on the upper center of the four sets of auxiliary rods (2). The lifting plate (71) slides within the four sets of auxiliary rods (2). Two sets of temperature measuring instruments (5) are installed at the front end of the mounting frame (1). The two sets of temperature measuring instruments (5) are electrically connected to the thermocouple (8) on the bottom side. A driving component (6) is installed on the right center of the mounting frame (1).

3. The aluminum alloy round ingot temperature measuring device according to claim 1, characterized in that: The rear end of the mounting bracket (1) is fitted with a rear fixing plate (11), and the front bottom side of the mounting bracket (1) is fixed with a rack plate (12).

4. The aluminum alloy round ingot temperature measuring device according to claim 2, characterized in that: The drive component (6) includes an upper fixed bearing (61) and an upper rotating shaft (62). The upper fixed bearing (61) is installed on the right side of the center of the mounting bracket (1) and the auxiliary plate (4). The upper fixed bearing (61) has an upper rotating shaft (62) at its center for rotation. The upper rotating shaft (62) is driven by a servo motor (63) at its top end. The upper rotating shaft (62) has an upper cross plate (64) fixed on its bottom side.

5. The aluminum alloy round ingot temperature measuring device according to claim 1, characterized in that: The rear end of the one-way gear (76) rises to mesh with the rack plate (12) for rotation. The one-way gear (76) consists of an internal gear (761) and an external gear (764). The internal gear (761) is installed at the center of the lead screw (74). Both ends of the internal gear (761) are provided with limit bearings (762). Both sets of limit bearings (762) are fixed at the center of the lead screw (74). Multiple sets of connecting rods (763) are provided on the side of the limit bearings (762) and fixed to the inner wall of the external gear (764). Multiple sets of limit teeth (765) are fixed around the inner wall of the external gear (764). The multiple sets of limit teeth (765) can limit the internal gear (761) to rotate in one direction.

6. The aluminum alloy round ingot temperature measuring device according to claim 5, characterized in that: The limiting tooth (765) includes a U-shaped block (7651) and a fixing plate (7652). The bottom ends of the U-shaped block (7651) are at different heights. The U-shaped block (7651) is connected to the front and back of the interior by fixing plates (7652). A rotating column (7653) is fixed in the center of the two sets of fixing plates (7652). A rotating plate (7654) is provided in the center of the rotating column (7653) for slight rotation. The rotating plate (7654) is connected to the shorter side of the bottom end of the U-shaped block (7651) by a spring (7655). The longer side of the bottom end of the U-shaped block (7651) does not obstruct the rotation of the internal gear (761). The bottom end of the rotating plate (7654) extends into the tooth gap of the internal gear (761).

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