Universal joint shaft heat treatment apparatus and method

Abstract

The present application relates to the technical field of heat treatment, in particular to a universal joint shaft heat treatment device and method. The device comprises a heating ring, a spraying ring and a connecting bracket. The heating ring and the spraying ring are coaxially arranged, and the heating ring is located inside the spraying ring. Both of them are fixedly connected with the connecting bracket. The inner circumferential wall of the spraying ring is provided with first spraying holes and second spraying holes, which are distributed along the circumference of the spraying ring and are arranged in an interval along the axial direction of the spraying ring. The axial position of the first spraying hole overlaps with the axial position of the heating ring. The axis of the first spraying hole and the axis of the spraying ring form a first included angle, and the axis of the second spraying hole and the axis of the spraying ring form a second included angle. The intersection point of the axes of the corresponding holes is located in the intersection area. When the universal joint shaft is arranged in the heating ring, the outer circumferential surface of the shaft rod and the intersection area have an interval. Thus, the problem of insufficient flow of the spraying device when the universal joint shaft is heat treated is solved.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology, and more specifically, to a heat treatment apparatus and method for a universal joint shaft. Background Technology

[0002] The universal joint shaft comprises a shaft and a ball-cage bell-shaped shell. The outer circumference of the shaft has a stepped structure, similar to a shoulder, creating a height difference in the radial direction of the shaft. During heat treatment, the universal joint shaft is placed vertically, with the ball-cage bell-shaped shell located at the bottom of the shaft. The shaft's diameter has a first step region with a decreasing diameter and a second step region with a increasing diameter along the vertically downward direction. The heat treatment process for the universal joint shaft involves heating and spray cooling. The heat treatment device typically includes a heating coil and a spray ring, with the heating coil located inside the spray ring.

[0003] Due to the influence of the heating ring on the coolant spray direction, the spray angle of the existing spray ring's spray holes forms a certain angle with the axis of the spray ring to ensure that the coolant spray path avoids the heating ring. During the cooling process, the spray water from the spray ring is usually sprayed downwards at an angle, which cannot adequately cool the first step area on the shaft, resulting in incomplete spraying. Simultaneously, the large diameter of the spherical cage bell shell means that during heating and cooling, the heating ring and spray ring need to move axially along the universal joint shaft, making it prone to axial interference between the spherical cage bell shell and the spray ring. Therefore, the axial dimensions are strictly limited when arranging the heating ring and spray ring. Reducing the axial dimension of the spray ring leads to a reduction in the number of spray holes, which in turn limits the flow rate of the spray device, resulting in insufficient spray flow when spraying the universal joint shaft. Therefore, how to achieve adequate spray cooling of the first step area of ​​the shaft during heat treatment of the universal joint shaft without easily interfering with the spherical cage bell shell is a problem that urgently needs to be solved in current heat treatment equipment. Summary of the Invention

[0004] To address the problem of insufficient spray flow during heat treatment of universal joint shafts, this invention provides a heat treatment device and method for universal joint shafts.

[0005] In a first aspect, the present invention provides a heat treatment apparatus for a universal joint shaft, the universal joint shaft heat treatment apparatus comprising:

[0006] Heating coil;

[0007] A spray ring is provided, with a heating coil coaxially arranged within it. The heating coil is located inside the spray ring. The inner circumferential wall of the spray ring has a first spray hole and a second spray hole. Multiple first spray holes are distributed circumferentially along the spray ring. Multiple second spray holes are also distributed circumferentially along the spray ring. The first and second spray holes are spaced apart axially along the spray ring. The axial position of the first spray hole overlaps with the axial position of the heating coil. A first angle exists between the axis of the first spray hole and the axis of the spray ring. A second angle exists between the axis of the second spray hole and the axis of the spray ring. Each first and second spray hole corresponds to a single one. The intersection point of the axis of the first spray hole and the corresponding axis of the second spray hole is located in an intersection area. With the universal joint shaft passing through the heating coil, the outer circumferential surface of the universal joint shaft is spaced from the intersection area.

[0008] A connecting bracket is provided, and the heating coil and the spray ring are respectively fixedly connected to the connecting bracket.

[0009] In some embodiments, the first included angle is smaller than the second included angle.

[0010] In some embodiments, the second included angle is between 80° and 100°.

[0011] In some embodiments, the diameter of the first spray hole is larger than the diameter of the second spray hole.

[0012] In some embodiments, the first spray holes are arranged in several groups along the axial direction of the spray ring; the second spray holes are arranged in several groups along the axial direction of the spray ring; the distribution area of ​​the first spray holes along the axial direction of the spray ring is larger than the distribution area of ​​the second spray holes along the axial direction of the spray ring.

[0013] In a second aspect, the present invention provides a heat treatment method for a universal joint shaft, applied to the universal joint shaft heat treatment apparatus described in any one of the first aspects; the heat treatment method for the universal joint shaft includes:

[0014] Based on the completion of the universal joint shaft positioning, the rotation of the universal joint shaft is controlled; wherein, the universal joint shaft includes an integrally formed shaft and a bell-shaped cover; in the state where the universal joint shaft is positioned, the shaft is located at the top of the bell-shaped cover, and the shaft is vertically arranged;

[0015] Since the universal joint shaft is in a rotating state, the heat treatment device is controlled to move downward from a first preset position to heat and spray cool the universal joint shaft; wherein, when the heat treatment device is in the first preset position, the heating coil of the heat treatment device is coaxially arranged with the universal joint shaft, and the heat treatment device is located at the top of the shaft.

[0016] Based on the heat treatment device reaching the second preset position, the heat treatment device is controlled to move upward and reset to the first preset position.

[0017] In some embodiments, the universal joint shaft heat treatment method further includes:

[0018] Since the heat treatment device is in a moving state, the water pressure of the second spray hole is controlled to be greater than the water pressure of the first spray hole.

[0019] In some embodiments, the universal joint shaft heat treatment method further includes:

[0020] Based on the fact that the universal joint shaft is in a rotating state, the dimensional parameters of the universal joint shaft are obtained; the dimensional parameters include the diameter of the shaft.

[0021] Based on the dimensional parameters, the first shoulder position and the second shoulder position of the shaft are obtained; the first shoulder position is the region where the diameter of the shaft gradually decreases vertically downwards; the second shoulder position is the region where the diameter of the shaft gradually increases vertically downwards.

[0022] Based on the fact that the heat treatment device is in a moving state, the position of the heat treatment device is acquired in real time at a preset frequency;

[0023] Adjust the water pressure of the second spray hole based on the position of the heat treatment device.

[0024] In some embodiments, adjusting the water pressure of the second spray hole based on the position of the heat treatment device includes:

[0025] Based on the fact that the heat treatment device has reached the first shoulder position, the water pressure of the second spray hole of the heat treatment device is controlled to increase to the first water pressure;

[0026] Based on the heat treatment device reaching the second shoulder position, the water pressure of the second spray hole of the heat treatment device is controlled to decrease to the second water pressure; the first water pressure is greater than the second water pressure.

[0027] In some embodiments, adjusting the water pressure of the second spray hole based on the position of the heat treatment device further includes:

[0028] Based on the fact that the heat treatment device is in the straight section region, the third water pressure of the second spray hole of the heat treatment device is adjusted, and the third water pressure is negatively correlated with the diameter of the shaft; wherein, the straight section region is the region where the diameter of the shaft is constant; the third water pressure is less than the first water pressure.

[0029] To address the problem of insufficient spray flow during heat treatment of universal joint shafts, this invention offers the following advantages:

[0030] The first spray hole and the axis of the spray ring have a first included angle, and the second spray hole and the axis of the spray ring have a second included angle, and the two correspond one-to-one. The intersection point of the axes of the first spray hole and the corresponding second spray hole is located in the intersection area. When the universal joint shaft passes through the heating ring, the outer circumference of its shaft is spaced from the intersection area. This allows the two streams of coolant sprayed from the first spray hole and the second spray hole to converge and influence each other, thereby changing the coolant spray angle. Furthermore, the flow compensation is formed by the impact of the inclined spray nozzles on the confluence to reduce the number of small-angle spray nozzles, thereby achieving effective spraying of the stepped position of the universal joint shaft, while reducing the overall height space occupied by the heating device and the spraying device. Attached Figure Description

[0031] Figure 1 A schematic diagram of a universal joint shaft heat treatment apparatus according to one embodiment is shown;

[0032] Figure 2 A simplified diagram of a universal joint shaft heat treatment device spraying according to one embodiment is shown;

[0033] Figure 3 A flowchart of a heat treatment method for a universal joint shaft according to one embodiment is shown.

[0034] Reference numerals: heating coil 10; spray ring 20; first spray hole 30; second spray hole 40; connecting bracket 50; intersection area 60; universal joint shaft 70; first shoulder 80; second shoulder 90. Detailed Implementation

[0035] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0036] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0037] The current heating ring 10 affects the coolant spray direction. The spray angle of the existing spray ring 20's spray holes forms a certain angle with the axis of the spray ring 20, ensuring the coolant spray path avoids the heating ring 10. During cooling, the spray ring 20 typically sprays water downwards at an angle, failing to adequately cool the first shoulder 80 on the shaft it passes through, resulting in incomplete spraying. Simultaneously, the large diameter of the ball cage bell-shaped shell means that during heating and cooling, the heating ring 10 and spray ring 20 need to move axially along the universal joint shaft 70, easily causing axial interference between the ball cage bell-shaped shell and the spray ring 20. Therefore, the axial dimensions of the heating ring 10 and spray ring 20 are strictly limited. Reducing the axial dimension of the spray ring 20 leads to a reduction in the number of spray holes, thus limiting the flow rate of the spray device, resulting in insufficient spray flow when spraying the universal joint shaft 70. Therefore, how to achieve sufficient spray cooling of the first shoulder 80 area of ​​the universal joint shaft 70 during heat treatment without easily interfering with the ball cage bell-shaped shell is a problem that current heat treatment equipment urgently needs to solve. Therefore, to solve the above problem, this invention provides a heat treatment apparatus for the universal joint shaft 70.

[0038] Example 1:

[0039] In this embodiment, as Figure 1 As shown, the heat treatment device for the universal joint shaft 70 includes a heating ring 10, a spray ring 20, and a connecting bracket 50.

[0040] The heating coil 10 can provide heating for the universal joint shaft 70 inserted therein, meeting the temperature requirements of the universal joint shaft 70 during the heat treatment process.

[0041] The heating coil 10 is coaxially arranged with the spray ring 20, and the heating coil 10 is located inside the spray ring 20, ensuring that the universal joint shaft 70 is heated and sprayed around the same axis, thus improving the uniformity of heating and spraying. The inner circumferential wall of the spray ring 20 has first spray holes 30 and second spray holes 40. Multiple first spray holes 30 and multiple second spray holes 40 are distributed along the circumference of the spray ring 20, expanding the spray coverage area through the multiple first spray holes 30 and multiple second spray holes 40.

[0042] Since the axial dimension of the spray ring 20 is strictly limited, the first spray hole 30 and the second spray hole 40 are arranged at intervals along the axial direction of the spray ring 20. The position of the first spray hole 30 in the axial direction of the spray ring 20 overlaps with the position of the heating coil 10 in the axial direction of the spray ring 20, thereby making full use of the overlapping area to arrange the first spray hole 30, reducing the space occupied by the first spray hole 30 in the axial direction, and ensuring sufficient spray flow. Because the first spray hole 30 interferes with the heating coil 10 during spraying, there is a first angle between the axis of the first spray hole 30 and the axis of the spray ring 20, and a second angle between the axis of the second spray hole 40 and the axis of the spray ring 20. The first spray hole 30 and the second spray hole 40 correspond one-to-one, and the intersection point of the axis of the first spray hole 30 and the corresponding axis of the second spray hole 40 is located in the intersection area 60. When the universal joint shaft 70 is inserted into the heating coil 10, the outer circumferential surface of the universal joint shaft 70 is spaced from the intersection area 60. In this way, the coolant sprayed from the first spray hole 30 and the coolant sprayed from the second spray hole 40 interact and influence each other, thereby changing the angle of coolant spraying. This makes the spraying direction of the coolant as close as possible to the surface normal direction of the first shoulder 80, thus enabling better and more thorough spraying of the first shoulder 80 of the universal joint shaft 70 with sufficient spraying force. Therefore, this invention achieves flow compensation by causing the coolant sprayed from the inclined first spray hole 30 and second spray hole 40 to collide and converge, ensuring that the first shoulder 80 of the universal joint shaft 70 is adequately sprayed with a large spray force, while simultaneously reducing the height of the heat treatment device for the universal joint shaft 70. The first shoulder 80 is the region where the diameter of the shaft gradually decreases vertically downwards, and the second shoulder 90 is the region where the diameter of the shaft gradually increases vertically downwards.

[0043] like Figure 2 As shown, the first spray hole 30 and the second spray hole 40 simultaneously spray coolant, which converges in the confluence area 60 and sprays towards the universal joint shaft 70 to form flow compensation. At the same time, the first spray hole 30 is arranged in the area where the axial position of the spray ring 20 overlaps with the axial position of the heating ring 10 in the spray ring 20, thereby reducing the axial dimension of the spray ring 20.

[0044] The heating coil 10 and the spray ring 20 are fixedly connected to the connecting bracket 50. During heat treatment of the universal joint shaft 70, the heating coil 10 and the spray ring 20 move synchronously. Simultaneously, the fixed connection ensures the stability of the relative positions of the heating coil 10 and the spray ring 20, preventing displacement of either during processing and thus avoiding impact on the heating and spraying effects.

[0045] Furthermore, such as Figure 2As shown, the first included angle between the axis of the first spray hole 30 and the axis of the spray ring 20 is smaller than the second included angle between the axis of the second spray hole 40 and the axis of the spray ring 20. This smaller first included angle allows the heating ring 10 to be avoided, preventing interference between the sprayed coolant and the heating ring 10. Simultaneously, it allows the two streams of coolant sprayed from the first spray hole 30 and the second spray hole 40 to form a spray angle at the confluence area 60 that is more suitable for the position of the first shoulder 80 of the universal joint shaft 70, improving the spray coverage effect on the recessed area of ​​the first shoulder 80 of the universal joint shaft 70. It also better complements the flow compensation mechanism formed by the impact and convergence of the inclined coolant. Furthermore, it avoids excessive angle differences between the two coolant streams, which could cause splashing and poor confluence.

[0046] Furthermore, such as Figure 2 As shown, the second included angle is between 80° and 100°. This ensures that the coolant sprayed from the second spray hole 40 has sufficient spray force to cover the outer surface of the universal joint shaft 70 that needs to be sprayed. It also avoids excessive dispersion of coolant due to an excessively large included angle, or splashing and poor confluence due to an excessively small included angle.

[0047] In other embodiments, three rows of first spray holes 30 are distributed along the axial direction of the spray ring 20, and two rows of second spray holes 40 are distributed along the axial direction of the spray ring 20. The first included angle is 30°~45°, and the second included angle is 80°~100°. The first included angles of the multiple first spray holes 30 are different, but within the range of the first included angle. The second included angles of the multiple second spray holes 40 are different, but within the range of the second included angle. This allows the coolant sprayed simultaneously from the multiple first spray holes and multiple second spray holes to collide in the confluence area 60, forming coolant flow compensation. Alternatively, one row of first spray holes 30 and one row of second spray holes 40 can be distributed along the axial direction of the spray ring 20, with a fixed first included angle and a fixed second included angle, so that the coolant sprayed simultaneously from the first spray holes and second spray holes collide in the confluence area 60, forming coolant flow compensation.

[0048] Furthermore, the diameter of the first spray hole 30 is larger than that of the second spray hole 40. This results in a larger volume of coolant sprayed from the first spray hole 30 compared to the coolant sprayed from the second spray hole, achieving flow compensation for the spraying effect on the universal joint shaft 70.

[0049] Furthermore, the first spray holes 30 are arranged in several groups along the axial direction of the spray ring 20. The second spray holes 40 are also arranged in several groups along the axial direction of the spray ring 20. The distribution area of ​​the first spray holes 30 along the axial direction of the spray ring 20 is larger than that of the second spray holes 40. This increases the axial position of the first spray holes 30 in the axial direction of the spray ring 20, fully utilizes the area where the axial positions of the first spray holes 30 and the heating coil 10 overlap in the axial direction of the spray ring 20, minimizes the axial dimensions of the spray ring 20, and further ensures the reduction of the height space occupied by the spray ring 20.

[0050] Example 2:

[0051] In this embodiment, as Figure 3 As shown, a heat treatment method for a universal joint shaft 70 includes steps S10 to S30. Steps S10 to S30 will be described in detail below:

[0052] Step S10: Based on the completion of the positioning of the universal joint shaft 70, control the rotation of the universal joint shaft 70. The universal joint shaft 70 includes an integrally formed shaft and a bell-shaped cover, which ensure the overall structural stability of the universal joint shaft 70. With the universal joint shaft 70 positioned, the shaft is located at the top of the bell-shaped cover and is vertically aligned. This ensures that the universal joint shaft 70 experiences balanced forces during rotation, preventing deviation. Controlling the rotation of the universal joint shaft 70 allows subsequent heating and spraying operations to be applied evenly to its outer circumference, preventing localized areas from being untreated and affecting processing quality.

[0053] In step S20, based on the universal joint shaft 70 being in a rotating state, the heat treatment device is controlled to move downward from a first preset position to heat and spray cool the universal joint shaft 70. In the first preset position, the heating coil 10 of the heat treatment device is coaxially arranged with the universal joint shaft 70, and the heat treatment device is located at the top of the shaft. The coaxial arrangement of the heating coil 10 with the universal joint shaft 70 ensures that the heat generated by the heating coil 10 is evenly applied to the surface of the universal joint shaft 70, avoiding localized overheating or underheating. As the heat treatment device moves downward from the first preset position at the top of the shaft, it gradually covers the shaft, the first shoulder 80, the second shoulder 90, and the area of ​​the shaft along the axial direction of the universal joint shaft 70, achieving heating and spraying. Combined with the rotation of the universal joint shaft 70, this ensures that each area receives sufficient heating and spraying.

[0054] In step S30, based on the heat treatment device reaching the second preset position, the heat treatment device is controlled to move upward and reset to the first preset position. Resetting the heat treatment device to the first preset position allows it to return to its initial working position, facilitating rapid processing after the next universal joint shaft 70 is positioned, thus improving the continuity of the production process. Simultaneously, the reset control enables the heat treatment device to be used cyclically, thereby ensuring the stability of production efficiency.

[0055] In some embodiments, the heat treatment method for the universal joint shaft 70 further includes step S40, in which steps S10, S20, S30, and S40 are performed sequentially. Step S40 will be described in detail below:

[0056] In step S40, since the heat treatment device is in a moving state, the water pressure of the second spray hole 40 is controlled to be greater than that of the first spray hole 30. The water pressure directly affects the spray force and range of the sprayed coolant. A higher water pressure in the second spray hole 40 allows the coolant sprayed from the second spray hole 40 to have stronger penetration and a longer spray distance. Meanwhile, the first spray hole 30 can maintain basic spray coverage with a relatively gentler coolant, avoiding coolant splashing and waste or uncontrolled coverage due to excessive water pressure. Flow compensation is achieved through the collision and confluence of the coolant sprayed from the first spray hole 30 and the second spray hole 40.

[0057] Furthermore, the heat treatment method for the universal joint shaft 70 also includes steps S50 to S80. The heat treatment method for the universal joint shaft 70 sequentially executes steps S10, S20, S30, S40, S50, S60, S70, and S80. Steps S50 to S80 will be described in detail below:

[0058] Step S50: Based on the universal joint shaft 70 being in a rotating state, obtain the dimensional parameters of the universal joint shaft 70, including the diameter of the shaft.

[0059] Step S60: Based on the dimensional parameters, accurately obtain the positions of the first shoulder 80 and the second shoulder 90 of the shaft to provide positional information for targeted spraying. The first shoulder 80 is the area where the diameter of the shaft gradually decreases vertically downwards, and the second shoulder 90 is the area where the diameter of the shaft gradually increases vertically downwards.

[0060] Step S70: Based on the fact that the heat treatment device is in a moving state, the position of the heat treatment device is acquired in real time at a preset frequency, so as to keep track of the relative dynamic position of the device with the first shoulder 80 and the second shoulder 90 in a timely manner, and avoid water pressure adjustment not being timely due to the lag in position information.

[0061] In step S80, the water pressure of the second spray hole 40 is adjusted based on the position of the heat treatment device. This ensures that the second spray hole 40 always covers the positions of the first shoulder 80 and the second shoulder 90 with an appropriate water pressure, further improving the effectiveness of the spray from the second spray hole 40.

[0062] Furthermore, step S80 of the heat treatment method for the universal joint shaft 70 includes steps S81 and S82. The heat treatment method for the universal joint shaft 70 sequentially executes steps S10, S20, S30, S40, S50, S60, S70, S81, and S82. Steps S81 and S82 will be described in detail below:

[0063] Step S81: Based on the heat treatment device reaching the first shoulder 80 position, the water pressure of the second spray hole 40 of the heat treatment device is increased to the first water pressure. This ensures that the coolant colliding and converging between the first and second spray holes is directed as far towards the first shoulder 80 as possible, thereby achieving effective spraying of the first shoulder 80.

[0064] In step S82, based on the heat treatment device reaching the second shoulder 90 position, the water pressure of the second spray hole 40 of the heat treatment device is reduced to a second water pressure, where the first water pressure is greater than the second water pressure. This causes the coolant from the collision and convergence of the first and second spray holes at the second shoulder 90 to be sprayed towards the second shoulder 90. When the heat treatment device reaches the first shoulder 80 position, a higher first water pressure ensures that the coolant covers the recessed area, and when it reaches the second shoulder 90 position, a lower second water pressure achieves adaptive spraying. Simultaneously, in conjunction with the rotation of the universal joint shaft 70 and the movement of the heat treatment device, the accuracy of spraying at the second shoulder 90 position is further improved, without the need for additional spray components or enlargement of the device size. This also helps maintain flow compensation formed by the impact and convergence of the inclined spray holes.

[0065] Furthermore, step S80 of the heat treatment method for the universal joint shaft 70 includes step S83. The heat treatment method for the universal joint shaft 70 sequentially executes steps S10, S20, S30, S40, S50, S60, S70, and S83. Step S83 will be described in detail below:

[0066] Step S83: Based on the fact that the heat treatment device is located in the straight section region, adjust the third water pressure of the second spray hole 40 of the heat treatment device. The third water pressure is negatively correlated with the diameter of the shaft. The straight section region is a region where the diameter of the shaft is constant, and the third water pressure is lower than the first water pressure. The negative correlation between the third water pressure and the shaft diameter can adapt to the spraying requirements of straight sections with different diameters. When the shaft diameter is larger, the circumference of the straight section surface is longer, and a lower water pressure can achieve coolant coverage, avoiding coolant splashing due to excessive water pressure. When the shaft diameter is smaller, a slightly higher water pressure can ensure that the coolant adheres tightly to the surface, preventing spray blind spots. Furthermore, the third water pressure being lower than the first water pressure can avoid over-spraying the straight section region without depressions, reducing media waste and energy consumption.

[0067] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A heat treatment device for a universal joint shaft, characterized in that, The universal joint shaft heat treatment device includes: Heating coil; A spray ring is provided, with a heating coil coaxially arranged within it. The heating coil is located inside the spray ring. The inner circumferential wall of the spray ring has a first spray hole and a second spray hole. Multiple first spray holes are distributed circumferentially along the spray ring. Multiple second spray holes are also distributed circumferentially along the spray ring. The first and second spray holes are spaced apart axially along the spray ring. The axial position of the first spray hole overlaps with the axial position of the heating coil. A first angle exists between the axis of the first spray hole and the axis of the spray ring. A second angle exists between the axis of the second spray hole and the axis of the spray ring. Each first and second spray hole corresponds to a single one. The intersection point of the axis of the first spray hole and the corresponding axis of the second spray hole is located in an intersection area. With the universal joint shaft passing through the heating coil, the outer circumferential surface of the universal joint shaft is spaced from the intersection area. A connecting bracket is provided, and the heating coil and the spray ring are respectively fixedly connected to the connecting bracket.

2. The universal joint shaft heat treatment device according to claim 1, characterized in that, The first included angle is smaller than the second included angle.

3. The universal joint shaft heat treatment device according to claim 2, characterized in that, The second included angle is between 80° and 100°.

4. The universal joint shaft heat treatment device according to claim 1, characterized in that, The diameter of the first spray hole is larger than the diameter of the second spray hole.

5. The universal joint shaft heat treatment device according to claim 1, characterized in that, The first spray holes are arranged in several groups along the axial direction of the spray ring; the second spray holes are arranged in several groups along the axial direction of the spray ring; the distribution area of ​​the first spray holes along the axial direction of the spray ring is larger than the distribution area of ​​the second spray holes along the axial direction of the spray ring.

6. A heat treatment method for a universal joint shaft, applied to the heat treatment apparatus for a universal joint shaft as described in any one of claims 1-5; characterized in that, Based on the completion of the universal joint shaft positioning, the rotation of the universal joint shaft is controlled; wherein, the universal joint shaft includes an integrally formed shaft and a bell-shaped cover; in the state where the universal joint shaft is positioned, the shaft is located at the top of the bell-shaped cover, and the shaft is vertically arranged; Since the universal joint shaft is in a rotating state, the heat treatment device is controlled to move downward from a first preset position to heat and spray cool the universal joint shaft; wherein, when the heat treatment device is in the first preset position, the heating coil of the heat treatment device is coaxially arranged with the universal joint shaft, and the heat treatment device is located at the top of the shaft. Based on the heat treatment device reaching the second preset position, the heat treatment device is controlled to move upward and reset to the first preset position.

7. A heat treatment method for a universal joint shaft according to claim 6, characterized in that, The heat treatment method for the universal joint shaft also includes: Since the heat treatment device is in a moving state, the water pressure of the second spray hole is controlled to be greater than the water pressure of the first spray hole.

8. A heat treatment method for a universal joint shaft according to claim 6, characterized in that, The heat treatment method for the universal joint shaft also includes: Based on the fact that the universal joint shaft is in a rotating state, the dimensional parameters of the universal joint shaft are obtained; the dimensional parameters include the diameter of the shaft. Based on the dimensional parameters, the first shoulder position and the second shoulder position of the shaft are obtained; the first shoulder position is the region where the diameter of the shaft gradually decreases vertically downwards; the second shoulder position is the region where the diameter of the shaft gradually increases vertically downwards. Based on the fact that the heat treatment device is in a moving state, the position of the heat treatment device is acquired in real time at a preset frequency; Adjust the water pressure of the second spray hole based on the position of the heat treatment device.

9. A heat treatment method for a universal joint shaft according to claim 8, characterized in that, Adjusting the water pressure of the second spray hole based on the position of the heat treatment device includes: Based on the fact that the heat treatment device has reached the first shoulder position, the water pressure of the second spray hole of the heat treatment device is controlled to increase to the first water pressure; Based on the heat treatment device reaching the second shoulder position, the water pressure of the second spray hole of the heat treatment device is controlled to decrease to the second water pressure; the first water pressure is greater than the second water pressure.

10. A heat treatment method for a universal joint shaft according to claim 9, characterized in that, The step of adjusting the water pressure of the second spray hole based on the position of the heat treatment device further includes: Based on the fact that the heat treatment device is in the straight section region, the third water pressure of the second spray hole of the heat treatment device is adjusted, and the third water pressure is negatively correlated with the diameter of the shaft; wherein, the straight section region is the region where the diameter of the shaft is constant; the third water pressure is less than the first water pressure.

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