Box-type resistance furnace for detecting diesel ash

Abstract

This invention relates to the field of resistance furnace technology, specifically a box-type resistance furnace for diesel fuel ash content testing. It includes a furnace body and a furnace door mounted on the furnace body. A covered ash dish is placed inside the furnace body. The device also includes a two-stage locking mechanism on both the furnace body and the furnace door. This mechanism locks the furnace door with a slight gap before fully closing it. By using the two-stage locking mechanism, the furnace door is first locked in a gap-free state to allow gas to escape and prevent pressure buildup, and then locked in a fully closed state to ensure airtightness and improve testing accuracy. Furthermore, under the action of a linkage mechanism, closing the furnace door causes the deflector tray and covered ash dish to rotate into the furnace, reducing manual interference. When the furnace door is fully closed, the covered ash dish is automatically opened, fully exposing the sample and ensuring reliable and standardized testing. The entire process involves few steps and is simple and convenient.

Description

Technical Field

[0001] This invention relates to the field of resistance furnace technology, specifically a box-type resistance furnace for detecting diesel ash content. Background Technology

[0002] Diesel ash content testing is a crucial step in assessing diesel quality. It involves determining the content of non-flammable substances (expressed as a mass fraction) remaining after diesel combustion using methods such as gravimetric analysis and instrumental analysis. In practice, the combustion of diesel in a box-type resistance furnace is meticulously divided into two key stages. In the first pre-combustion stage, a lid is placed over an ash dish containing diesel, and then the dish is placed inside the box-type resistance furnace. A slight gap is left in the furnace door. Under these specific conditions, low-temperature combustion is carried out for a period of time to initially remove some volatile and flammable components from the diesel. The second stage involves opening the lid of the ash dish to fully expose the diesel sample, then completely closing the furnace door for high-temperature combustion. After a period of thorough combustion, the entire combustion operation is complete, laying the foundation for accurate calculation of the diesel ash content.

[0003] However, the aforementioned rigorous and meticulous diesel ash content testing procedure has some inconveniences. Specifically, during the pre-ignition stage, to ensure proper ventilation and temperature control, staff must carefully open the furnace door while maintaining a slight gap. This operation requires precise control over the size of the gap, as even slight errors can affect the pre-ignition effect. After pre-ignition, the furnace door must be manually opened completely to allow the ash dish lid to be opened, ensuring the sample is fully exposed to the high-temperature environment for subsequent high-temperature ignition. Throughout the entire process, these frequent and precise actions must be performed manually, which not only consumes a significant amount of time and effort but is also prone to operational errors due to human factors, thus affecting the accuracy of the final test results and causing considerable trouble for the entire testing work. Therefore, we propose a box-type resistance furnace for diesel ash content testing. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a box-type resistance furnace for diesel ash content testing, comprising a furnace body and a furnace door installed on the furnace body. A covered ash dish is placed inside the furnace body. The furnace body also includes a two-stage locking mechanism on both the furnace body and the furnace door, used to first lock the furnace door with a certain gap during the closing process, and then lock it completely closed. A deflection tray is provided on the furnace body, and the covered ash dish is placed on the deflection tray. A linkage is provided inside the furnace body, and the furnace door is connected to the deflection tray via the linkage. During the closing process, the linkage can drive the deflection tray and the covered ash dish to rotate into the furnace body; and when the furnace door is completely closed, the linkage can automatically trigger and open the covered ash dish.

[0005] In some embodiments, the linkage includes a cylinder rotatably disposed within the body of the resistance furnace, a connecting plate fixedly connected between the cylinder and the deflection tray, the cylinder being hollow, a shaft slidably connected within the body of the resistance furnace, one end of the shaft being located within and connected to the cylinder, a deflection plate being disposed at one end of the shaft, a shaft rotatably connected at one end of the deflection plate, a shaft rotatably connected to the furnace door, and a connecting rod fixedly connected between the two shafts rotatably for driving the deflection tray to deflect when the furnace door is deflected.

[0006] In some embodiments, the covered ash dish includes an ash dish body on which a cover is mounted;

[0007] A sliding column is slidably connected to one end of the cylinder, and one end of the shaft is fixedly connected to the sliding column. A strip plate is fixedly connected to one end of the sliding column, and a U-shaped plate is fixedly connected to one end of the strip plate. A connecting column is fixedly connected to the top of the cover, and a limiting circular plate is fixedly connected to the top of the connecting column. The connecting column is embedded in the U-shaped plate to connect the sliding column and the cover.

[0008] Furthermore, a rotating column is fixedly connected to the shaft, and a tension spring with one end fixed to the rotating column is installed inside the column. When the furnace door is open, the tension spring is in a stretched state. A round rod is slidably connected inside the resistance furnace body, and a guide groove is provided on the rotating column. One end of the round rod is located in the guide groove, which is used to reset the tension spring at the moment the furnace door is closed, causing the round rod to slide along the guide groove, thereby driving the sliding column to move upward.

[0009] During the process of opening the furnace door, the round rod slides along the guide groove to drive the sliding column to move down and retract, while the tension spring is stretched under force.

[0010] In some embodiments, the guide groove includes an arc-shaped groove formed on a rotating column, a vertical groove communicating with the arc-shaped groove on the rotating column, and a spiral groove formed on the rotating column with both ends communicating with the vertical groove and the arc-shaped groove respectively. One end of the round rod is located in the vertical groove and is slidably connected to its inner wall. The spiral groove is designed to have the same depth as the vertical groove, and the arc-shaped groove is designed to have a deeper depth than the vertical groove. An inclined surface is provided at the transition between the arc-shaped groove and the vertical groove.

[0011] A spring is fixedly connected to one end of the round rod, and one end of the spring is fixed to the inner wall of the resistance furnace body.

[0012] In some embodiments, a sliding groove is provided on the sliding column, and a sliding protrusion is fixedly connected to the inner wall of the cylinder. One end of the sliding protrusion is located in the sliding groove and is used to guide and limit the movement of the sliding column relative to the cylinder.

[0013] A sliding groove is also provided on the shaft, and a sliding protrusion is fixedly connected to the inner wall of the deflection plate. One end of the sliding protrusion is located in the sliding groove and is used to guide and limit the movement of the shaft relative to the deflection plate.

[0014] In some embodiments, the two-section locking component includes an L-shaped plate slidably disposed on the furnace door, a slide rod fixedly connected inside the furnace door, a spring II sleeved on the slide rod with its two ends fixedly connected to the L-shaped plate and the inner wall of the furnace door respectively, a latch fixedly connected to one end of the L-shaped plate, the latch having an arc-shaped design at one end, and a handle fixedly connected to one end of the L-shaped plate.

[0015] An arc-shaped block is fixedly connected to the main body of the electric resistance furnace. The arc-shaped block has two slots, and the two slots adopt a stepped design.

[0016] In some embodiments, a limiting groove is provided on the deflection tray, and the bottom of the ash dish body is located in the limiting groove.

[0017] The present invention has at least the following beneficial effects:

[0018] This device utilizes a two-stage locking mechanism to close the furnace door. First, it locks in a slightly open state to allow gas to escape from the furnace and prevent pressure buildup. Then, it locks in a fully closed state to ensure airtightness and improve detection accuracy. Furthermore, under the action of the linkage mechanism, closing the furnace door can drive the deflector tray and the covered ash dish into the furnace, reducing manual interference. When the furnace door is fully closed, it automatically triggers the opening of the covered ash dish, allowing the sample to be fully exposed and ensuring that the detection is standardized and reliable. The entire process involves few steps and is simple and convenient. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 Schematic diagram of partial cross-section;

[0021] Figure 3 For the present invention Figure 2 Another structural diagram;

[0022] Figure 4 This is a schematic diagram of the handle structure of the present invention;

[0023] Figure 5 For the present invention Figure 4 Explosion structure diagram;

[0024] Figure 6 For the present invention Figure 3 Schematic diagram of partial cross-section;

[0025] Figure 7 For the present invention Figure 6 Schematic diagram of partial cross-section;

[0026] Figure 8 For the present invention Figure 7 Schematic diagram of partial cross-section;

[0027] Figure 9 This is a schematic diagram of the structure at the rotating column of the present invention.

[0028] In the diagram: 1-Resistant furnace body; 11-Furnace door; 12-Ash dish with cover; 2-Two-section locking component; 3-Deflection tray; 4-Linkage component; 41-Cylinder; 42-Connecting plate; 43-Shaft 1; 44-Deflection plate; 45-Shaft 2; 46-Connecting rod; 47-Ash dish body; 48-Lid; 49-Sliding column; 51-Strip plate; 52-U-shaped plate; 53-Connecting column; 54-Limiting circular plate; 55-Rotating column; 56-Tension spring; 57-Round rod; 58-Guide groove component; 59-Arc groove; 61-Vertical groove; 62-Spiral groove; 63-Spring 1; 64-Sliding groove; 65-Sliding protrusion; 66-L-shaped plate; 67-Sliding rod; 68-Spring 2; 69-Clamping pin; 71-Handle; 72-Arc block; 73-Clamping groove; 74-Limiting groove; 75-Sloping surface. Detailed Implementation

[0029] 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.

[0030] Please see Figures 1-9The present invention provides a technical solution: a box-type resistance furnace for diesel ash content detection, including a resistance furnace body 1, a furnace door 11 rotatably connected to the resistance furnace body 1 via a rotating shaft, a covered ash dish 12 placed inside the resistance furnace body 1, and a two-section locking member 2 set on the resistance furnace body 1 and the furnace door 11, used to lock the furnace door 11 in a state with a certain gap during the process of closing the furnace door 11, and then lock the furnace door 11 in a completely closed state.

[0031] The deflection tray 3 is set on the main body 1 of the resistance furnace, and the covered ash dish 12 is placed on the deflection tray 3;

[0032] Linkage component 4 is installed inside the resistance furnace body 1. The furnace door 11 is connected to the deflection tray 3 through the linkage component 4. During the process of closing the furnace door 11, the linkage component 4 can drive the deflection tray 3 and the covered ash dish 12 to rotate into the resistance furnace body 1. When the furnace door 11 is completely closed, the linkage component 4 can automatically trigger and open the covered ash dish 12.

[0033] Specifically, this device uses a two-stage locking mechanism 2 to lock the furnace door 11. First, it locks the door in a slightly open state to allow gas to escape from the furnace and prevent pressure buildup. Then, it locks the door in a fully closed state to ensure airtightness and improve detection accuracy. Furthermore, under the action of the linkage mechanism 4, closing the furnace door 11 can drive the deflection tray 3 and the covered ash dish 12 into the furnace, reducing human interference. When the furnace door 11 is fully closed, it automatically triggers the opening of the covered ash dish 12 to fully expose the sample, ensuring that the detection is standardized and reliable. The entire process involves few steps and is simple and convenient.

[0034] There are two reasons for leaving a gap in the furnace door 11 during the pre-calcination stage. First, diesel fuel contains various components. During the pre-calcination stage, as the temperature rises, some volatile components, such as low-boiling-point hydrocarbons, will rapidly vaporize. If the furnace door 11 is completely closed, these volatile substances will accumulate inside the furnace, leading to increased pressure and potentially causing safety hazards such as furnace damage or even an explosion. Leaving a gap allows these volatile substances to escape from the furnace in a timely manner, ensuring stable pressure inside the furnace.

[0035] Secondly, during the pre-calcination process, some components in the diesel fuel undergo an oxidation reaction. Leaving a gap allows outside air to enter the furnace, providing sufficient oxygen for the oxidation reaction and ensuring that the diesel fuel can burn and decompose more completely. This makes the ash content test results more accurately reflect the true content of non-flammable components in the diesel fuel. If the furnace door 11 is completely sealed, the oxygen inside the furnace is limited, the oxidation reaction is incomplete, and it will affect the test results.

[0036] There are two reasons why the ash dish containing diesel fuel needs to be covered during the pre-ignition stage. First, during the pre-ignition stage, diesel fuel reacts violently when heated, which may result in boiling and splashing. Covering the dish prevents diesel fuel from splashing out of the ash dish, avoiding contamination inside the furnace. It also reduces sample loss, ensures the integrity of the test sample, and makes the test results more reliable.

[0037] Secondly, covering the ash container can prevent dust and impurities from falling into the ash dish, thus preventing these foreign substances from interfering with the test results and ensuring that the ash detected is the non-flammable component remaining after the diesel fuel is burned, thereby improving the accuracy and precision of the test.

[0038] The linkage 4 includes a cylinder 41 rotatably connected inside the resistance furnace body 1. A connecting plate 42 is fixedly connected between the cylinder 41 and the deflection tray 3. A sliding groove is provided on the resistance furnace body 1 to cooperate with the deflection of the connecting plate 42. The connecting plate 42 is slidably connected to the inner wall of the sliding groove. The cylinder 41 adopts a hollow design. A shaft 43 is slidably connected inside the resistance furnace body 1. One end of the shaft 43 is located inside the cylinder 41 and connected to it. A deflection plate 44 is provided at one end of the shaft 43. A shaft 45 is rotatably connected at one end of the deflection plate 44. A shaft 45 is also rotatably connected to the furnace door 11. A connecting rod 46 is fixedly connected between the two shafts 45.

[0039] When operating the resistance furnace, the opening and closing of the furnace door 11 will trigger a series of linked actions: when the furnace door 11 is opened, the deflection plate 44 will be deflected through the connecting rod 46, which will cause the shaft 43 to rotate, and finally drive the cylinder 41, the connecting plate 42, the deflection tray 3 and the covered ash dish 12 placed on it to deflect synchronously to the opening of the resistance furnace body 1, so that the staff can place the covered ash dish 12; when the furnace door 11 is closed, the deflection tray 3 will be deflected into the furnace synchronously, and the covered ash dish 12 containing diesel oil will be sent to the heating center position of the furnace cavity.

[0040] The covered ash dish 12 includes an ash dish body 47, and a cover 48 is installed on the ash dish body 47;

[0041] A sliding column 49 is slidably connected to one end of the cylinder 41, and one end of the shaft 43 is fixedly connected to the sliding column 49. A strip plate 51 is fixedly connected to one end of the sliding column 49. A sliding groove is provided on the main body 1 of the electric resistance furnace to cooperate with the deflection of the strip plate 51. The strip plate 51 is slidably connected to the inner wall of the sliding groove. A vertical guide groove is also provided on the main body 1 of the electric resistance furnace to communicate with the sliding groove. When the strip plate 51 moves up and drives the cover 48 to open, it can slide along the inner wall of the vertical guide groove. A U-shaped plate 52 is fixedly connected to one end of the strip plate 51, and a connecting column 53 is fixedly connected to the top of the cover 48. A limiting circular plate 54 is fixedly connected to the top of the connecting column 53. The connecting column 53 is embedded in the U-shaped plate 52 to connect the sliding column 49 and the cover 48.

[0042] Furthermore, a rotating column 55 is fixedly connected to shaft 43, and a tension spring 56 with one end fixedly connected to the rotating column 55 is installed inside the cylinder 41. When the furnace door 11 is in the open state, the tension spring 56 is in the stretched state under force. A round rod 57 is slidably connected inside the resistance furnace body 1. A guide groove 58 is provided on the rotating column 55, and one end of the round rod 57 is located in the guide groove 58. When the furnace door 11 is closed, the tension spring 56 resets and drives the round rod 57 to slide along the guide groove 58, so as to drive the sliding column 49 to move upward.

[0043] During the process of opening the furnace door 11, the round rod 57 slides along the guide groove 58 to drive the sliding column 49 to move down and retract, while the tension spring 56 is stretched by the force.

[0044] The guide groove 58 includes an arc-shaped groove 59 formed on the rotating column 55, a vertical groove 61 formed on the rotating column 55 communicating with the arc-shaped groove 59, and a spiral groove 62 formed on the rotating column 55 with both ends communicating with the vertical groove 61 and the arc-shaped groove 59 respectively. One end of the round rod 57 is located in the vertical groove 61 and is slidably connected to its inner wall. The spiral groove 62 is designed to have the same depth as the vertical groove 61, and the arc-shaped groove 59 is designed to have a deeper depth than the vertical groove 61. An inclined surface 75 is provided at the transition between the arc-shaped groove 59 and the vertical groove 61.

[0045] A spring 63 is fixedly connected to one end of the round rod 57, and one end of the spring 63 is fixed to the inner wall of the resistance furnace body 1.

[0046] Specifically, when the furnace door 11 is open, one end of the round rod 57 is located in the arc groove 59, and the tension spring 56 is in a stretched state. Subsequently, during the process of closing the furnace door 11, the shaft 43 is driven to rotate, which in turn drives the rotating column 55 to rotate, thereby causing the arc groove 59 to slide relative to the round rod 57. During this process, the round rod 57 slides into the vertical groove 61 guided by the inclined surface 75. At the same time, the spring 63 is compressed and provides the round rod 57 with self-recovery capability. When the round rod 57 is fully embedded in the vertical groove 61, the furnace door 11 is also fully closed. The tension spring 56 resets and drives the rotating column 55 to move upward. At the same time, the vertical groove 61 slides relative to the round rod 57 until the round rod 57 is embedded in the spiral groove 62. The upward movement of the rotating column 55 will drive the shaft 43, the sliding column 49, the strip plate 51, and the U-shaped plate 52 to move upward, thereby driving the cover 48 connected to the U-shaped plate 52 to move upward and open.

[0047] Conversely, when the furnace door 11 is opened after the burning is completed, the shaft 43 is also rotated, which in turn causes the spiral groove 62 on the rotating column 55 to slide relative to the round rod 57, thereby causing the rotating column 55 to move down, which in turn causes the cover 48 to move down and be put back on the ash dish. At the same time, the round rod 57 is also reset by the spring 63 and re-embedded into the arc groove 59, and the tension spring 56 is also stretched again to prepare for the next closing of the furnace door 11.

[0048] A sliding groove 64 is provided on the sliding column 49, and a sliding protrusion 65 is fixedly connected to the inner wall of the cylinder 41. One end of the sliding protrusion 65 is located in the sliding groove 64, which is used to guide and limit the movement of the sliding column 49 relative to the cylinder 41.

[0049] A groove 64 is also provided on shaft 43, and a sliding protrusion 65 is fixedly connected to the inner wall of the deflection plate 44. One end of the sliding protrusion 65 is located in the groove 64, which is used to guide and limit the movement of shaft 43 relative to the deflection plate 44.

[0050] The two-section locking component 2 includes an L-shaped plate 66 that is slidably mounted on the furnace door 11, a slide rod 67 that is fixedly connected inside the furnace door 11, a spring 68 that is sleeved on the slide rod 67 and fixedly connected at both ends to the L-shaped plate 66 and the inner wall of the furnace door 11 respectively, a locking pin 69 that is fixedly connected to one end of the L-shaped plate 66, the locking pin 69 having an arc-shaped design at one end, and a handle 71 that is fixedly connected to one end of the L-shaped plate 66.

[0051] An arc-shaped block 72 is fixedly connected to the main body 1 of the electric resistance furnace. Two slots 73 are provided on the arc-shaped block 72, and the two slots 73 adopt a stepped design.

[0052] Specifically, when the operator closes the furnace door 11, if they do not actively pull down the handle 71, the arc-shaped end of the latch 69 on the furnace door 11 will be pushed down when it hits the edge of the shallower slot 73, causing the L-shaped plate 66 to move down and compress the second spring 68. When the latch 69 aligns with the slot 73, the second spring 68 will reset and cause the latch 69 to insert into the slot 73, thus automatically completing a locking phase. At this time, there is a certain gap between the furnace door 11 and the resistance furnace. Subsequently, after the pre-burning is completed, the operator pulls down the handle 71 to move the L-shaped plate 66, which in turn causes the latch 69 to move down. At this time, the second spring 68 is compressed and contracts. Then, the operator pushes the furnace door 11 until it is completely closed and then releases the handle 71, allowing the latch 69 to insert into the deeper slot 73 under the action of the second spring 68, thus completing the final locking of the furnace door 11.

[0053] A limiting groove 74 is provided on the deflection tray 3, and the bottom of the ash dish body 47 is located in the limiting groove 74 to temporarily limit the ash dish body 47, so as to improve the stability of the device during operation.

[0054] 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.

[0055] 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.

Claims

1. A box-type resistance furnace for detecting diesel ash content, comprising a furnace body (1) and a furnace door (11) installed on the furnace body (1), wherein a covered ash dish (12) is placed inside the furnace body (1), characterized in that, It also includes: Two-stage locking components (2) are installed on the main body (1) of the electric resistance furnace and the furnace door (11). They are used to lock the furnace door (11) with a certain gap in the process of closing the furnace door (11) first, and then lock the furnace door (11) to a completely closed state. A deflection tray (3) is set on the main body (1) of the resistance furnace, and a covered ash dish (12) is placed on the deflection tray (3); The linkage component (4) is installed inside the resistance furnace body (1). The furnace door (11) is connected to the deflection tray (3) through the linkage component (4). During the process of closing the furnace door (11), the linkage component (4) can drive the deflection tray (3) and the covered ash dish (12) to rotate into the resistance furnace body (1). When the furnace door (11) is completely closed, the linkage component (4) can automatically trigger and open the covered ash dish (12).

2. The box-type resistance furnace for diesel ash content detection according to claim 1, characterized in that: The linkage (4) includes a cylinder (41) rotatably disposed inside the resistance furnace body (1), a connecting plate (42) fixedly connected between the cylinder (41) and the deflection tray (3), the cylinder (41) adopts a hollow design, a shaft (43) is slidably connected inside the resistance furnace body (1), one end of the shaft (43) is located inside the cylinder (41) and connected to it, a deflection plate (44) is provided at one end of the shaft (43), a shaft (45) is rotatably connected at one end of the deflection plate (44), a shaft (45) is also rotatably connected to the furnace door (11), and a connecting rod (46) is fixedly connected between the two shafts (45) to drive the deflection tray (3) to deflect when the furnace door (11) is deflected.

3. The box-type resistance furnace for diesel ash content detection according to claim 2, characterized in that: The covered ash dish (12) includes an ash dish body (47) and a cover (48) is installed on the ash dish body (47). A sliding column (49) is slidably connected to one end of the cylinder (41), and one end of the shaft (43) is fixedly connected to the sliding column (49). A strip plate (51) is fixedly connected to one end of the sliding column (49), and a U-shaped plate (52) is fixedly connected to one end of the strip plate (51). A connecting column (53) is fixedly connected to the top of the cover (48), and a limiting circular plate (54) is fixedly connected to the top of the connecting column (53). The connecting column (53) is embedded in the U-shaped plate (52) to connect the sliding column (49) and the cover (48). A rotating column (55) is fixedly connected to the shaft (43). A tension spring (56) with one end fixed to the rotating column (55) is installed inside the cylinder (41). When the furnace door (11) is open, the tension spring (56) is in a state of tension and extension. A round rod (57) is slidably connected inside the resistance furnace body (1). A guide groove (58) is provided on the rotating column (55). One end of the round rod (57) is located inside the guide groove (58). When the furnace door (11) is closed, the tension spring (56) resets and drives the round rod (57) to slide along the guide groove (58) so as to drive the sliding column (49) to move upward. During the process of opening the furnace door (11), the round rod (57) slides along the guide groove (58) to drive the sliding column (49) to move down and retract, while the tension spring (56) is stretched by force.

4. The box-type resistance furnace for diesel ash content detection according to claim 3, characterized in that: The guide groove (58) includes an arc-shaped groove (59) opened on a rotating column (55), a vertical groove (61) opened on the rotating column (55) communicating with the arc-shaped groove (59), and a spiral groove (62) opened on the rotating column (55) with its two ends communicating with the vertical groove (61) and the arc-shaped groove (59) respectively. One end of the round rod (57) is located in the vertical groove (61) and is slidably connected to its inner wall. The spiral groove (62) is designed to have the same depth as the vertical groove (61), and the arc-shaped groove (59) is designed to have a deeper depth than the vertical groove (61). An inclined surface (75) is provided at the transition between the arc-shaped groove (59) and the vertical groove (61). A spring (63) is fixedly connected to one end of the round rod (57), and one end of the spring (63) is fixed to the inner wall of the resistance furnace body (1).

5. The box-type resistance furnace for diesel ash content detection according to claim 4, characterized in that: The sliding column (49) is provided with a sliding groove (64), and a sliding protrusion (65) is fixedly connected to the inner wall of the cylinder (41). One end of the sliding protrusion (65) is located in the sliding groove (64) and is used to guide and limit the movement of the sliding column (49) relative to the cylinder (41). A groove (64) is also provided on the shaft (43), and a sliding protrusion (65) is fixedly connected to the inner wall of the deflection plate (44). One end of the sliding protrusion (65) is located in the groove (64) and is used to guide and limit the movement of the shaft (43) relative to the deflection plate (44).

6. The box-type resistance furnace for diesel ash content detection according to claim 5, characterized in that: The two-section locking component (2) includes an L-shaped plate (66) slidably mounted on the furnace door (11), a slide rod (67) fixedly connected inside the furnace door (11), a spring (68) with both ends fixedly connected to the L-shaped plate (66) and the inner wall of the furnace door (11) respectively on the slide rod (67), a latch (69) fixedly connected to one end of the L-shaped plate (66), the latch (69) having an arc-shaped design at one end, and a handle (71) fixedly connected to one end of the L-shaped plate (66). An arc-shaped block (72) is fixedly connected to the main body (1) of the electric resistance furnace. Two slots (73) are opened on the arc-shaped block (72), and the two slots (73) adopt a stepped design.

7. The box-type resistance furnace for diesel ash content detection according to claim 6, characterized in that: A limiting groove (74) is provided on the deflection tray (3), and the bottom of the ash dish body (47) is located in the limiting groove (74).

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