Forward and reverse bending arc-changing unit and forward and reverse bending forming equipment

Abstract

The utility model relates to a positive and negative bending arc-changing unit and positive and negative bending forming equipment, the positive and negative bending arc-changing unit comprises a flexible shaft roller way, a supporting assembly and a plurality of height adjusting mechanisms, the flexible shaft roller way is supported above the supporting assembly through the height adjusting mechanisms, and the supporting assembly comprises a lower supporting assembly and a middle supporting assembly; the height adjusting mechanism comprises a driving mechanism and a lead screw, the driving mechanism is connected to the lower supporting assembly through a lower hinge piece, and the top end of the lead screw is connected with the flexible shaft roller way through an upper hinge piece. The lower supporting assembly is provided with a moving space for the lead screw to penetrate through and swing. When the flexible shaft roller way is in the initial flattened state, the space between the flexible shaft roller way and the lower supporting assembly is defined as a reverse bending space, the height of the reverse bending space is set as H, the length of the flexible shaft is set as L, and H is larger than or equal to 0.3 L / pi and smaller than or equal to 2L / pi; the positive and negative bending forming equipment comprises a plurality of positive and negative bending arc changing units. The forming device has the functions of forward bending and backward bending, and forming of forward-bent glass and backward-bent glass is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of curved glass forming equipment, and particularly relates to a positive and negative bending variable arc unit and a positive and negative bending forming equipment. Background Art

[0002] As Figure 1 shown in the prior art: in CN229220U, a conveying roller path with variable curvature, in the variable arc unit, the soft shaft roller path 1 in the variable arc unit is lifted and the arc is adjusted by the lead screws 4 of a plurality of height adjusting mechanisms. The driving mechanism of the height adjusting mechanism is rotationally connected to the supporting square tube 3 through a mounting seat. The top end of the lead screw 4 is connected to an elastic member through a hinge seat 6, and the elastic member supports the soft shaft roller path 1 through a soft shaft support 2. This variable arc unit uses the lead screw 4 to push multiple points of the soft shaft roller path 1 to perform upward positive bending and arc changing. While the lead screw 4 is lifting and lowering, the hinge seat 6 rotates around the hinge point of the movable end of the lead screw 4, and drives the elastic member 11 and the soft shaft roller path 1 to change the arc. The space utilized for the arc change of the soft shaft roller path is the space above the soft shaft roller path when the soft shaft roller path is in a flattened state, and it cannot achieve downward reverse bending of the soft shaft roller path.

[0003] In this disclosed patent, the space between the soft shaft roller path and the supporting square tube is mainly an assembly space, where components such as hinge seats, soft shaft supports, and elastic members need to be assembled. There is no deformation space required for reverse bending. Especially when the soft shaft roller path is in a flattened state, this space is even narrower, making it difficult to form reverse-bent glass. Therefore, only positive-bent glass can be formed. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a positive and negative bending variable arc unit and a positive and negative bending forming equipment. This variable arc unit can have both positive and negative bending functions, and can achieve the forming of positive-bent glass and reverse-bent glass.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: a positive and negative bending variable arc unit, which includes a soft shaft roller path, a supporting component, and a plurality of height adjusting mechanisms. The soft shaft roller path is supported above the supporting component through a plurality of height adjusting mechanisms. The supporting component includes a lower supporting component and a middle supporting component; the height adjusting mechanism includes a driving mechanism and a lead screw. The driving mechanism is connected to the lower supporting component through a lower hinge member, and the top end of the lead screw is connected to the soft shaft roller path through an upper hinge member; an activity space for the lead screw to pass through and swing is provided on the lower supporting component.

[0006] When the soft shaft roller path is in a flattened initial state, the space between the soft shaft roller path and the lower supporting component is defined as the reverse bending space. Let the height of the reverse bending space be H and the length of the soft shaft roller path be L, then 0.3L / π ≤ H ≤ 2L / π.

[0007] The beneficial effects are as follows: The positive and negative bending arc-changing unit of the present utility model combines with the length of the flexible shaft roller path to provide an effective bending space. An adequate bending space is formed through the middle support assembly, further defining the relationship between the bending space and the length of the flexible shaft roller path, enabling the arc-changing unit to not only form a positive arc but also achieve a negative arc. The radius range of the formed arc glass is wider, and the radius that can be formed by negative bending is smaller. The setting of the upper hinge piece and the lower hinge piece enables the lead screw to swing along with the flexible shaft roller path when it forms an arc, making the radius of the arc formed by the flexible shaft roller path smaller.

[0008] Further, when the flexible shaft roller path is in the initial flattened state, let the included angle between the lead screw and the horizontal direction be θ, and the included angle between each lead screw and the horizontal direction is θ ≤ 90°. The outermost lead screws at both ends of the flexible shaft roller path are inclined and θ < 90°, and the lower ends of the outermost lead screws deviate towards the middle support assembly.

[0009] The beneficial effects are as follows: The lead screws at both ends of the flexible shaft roller path of the present utility model are inclined in the initial state, especially the outermost lead screws are inclined. On the basis of achieving positive bending, the deformability of negative bending can be further increased, and negative bending with a smaller radius can be achieved.

[0010] Further, when the flexible shaft roller path is in the initial flattened state, multiple lead screws are all inclined, and the included angle θ between the lead screw closer to the middle support assembly and the horizontal direction is larger.

[0011] The beneficial effects are as follows: All the lead screws are inclined, which can make the arc formed after the negative bending of the flexible shaft roller path smoother, contributing to the improvement of the glass forming quality; the deformation degree of the part closer to the middle of the flexible shaft roller path during negative bending is small, so the corresponding included angle θ can be larger.

[0012] Further, when the flexible shaft roller path is in the initial flattened state, the included angle between the outermost lead screws at both ends of the flexible shaft roller path and the horizontal direction is 70° ≤ θ ≤ 85°.

[0013] The beneficial effects are as follows: The value of this included angle θ can have a relatively small impact on the variable arc degree of positive bending while taking into account achieving negative bending with a smaller radius.

[0014] Further, it further includes an elastic member and a flexible shaft support. The elastic member is arranged parallel to the flexible shaft roller path. The flexible shaft roller path is fixed on the elastic member through the flexible shaft support, and the elastic member is connected to the lead screw through the upper hinge piece.

[0015] The beneficial effects are as follows: The setting of the elastic member and the flexible shaft support can improve the arc-forming accuracy of the flexible shaft roller path. The lead screw drives the elastic member to deform to drive the flexible shaft roller path to form an arc, further making the arc formed by the flexible shaft roller path smoother, improving the arc-forming accuracy, and improving the glass forming quality.

[0016] Further, the moving space is a long slot hole provided on the lower support assembly.

[0017] The beneficial effect is that when the lower support assembly is a square tube, the moving space can be formed by setting the form of a long slot hole.

[0018] Further, the lower support assembly is a hollow structure, and the hollow structure provides a moving space for the swing of the lead screw.

[0019] The beneficial effect is that another way of setting the moving space is given.

[0020] Further, the lead screws on the left and right sides of the middle support assembly are symmetrically arranged.

[0021] The beneficial effect is that the symmetrical distribution of the lead screws can make the arcs on both sides of the middle part of the flexible shaft roller path symmetrical after forming an arc, so as to ensure the forming quality of the glass.

[0022] Further, the distance between two adjacent lead screws is 400 mm - 500 mm.

[0023] The beneficial effect is that the setting of the lead screw arrangement interval makes the distribution of the arc-changing points driven by the lead screws on the flexible shaft roller path more reasonable, and makes the arc formed by the flexible shaft roller path smoother.

[0024] Further, the lower support assembly includes a left swing arm and a right swing arm. The inner ends of the left swing arm and the right swing arm are respectively hinged on both sides of the middle support assembly; the left swing arm and the right swing arm are connected to the driving mechanism of the height adjustment mechanism through a lower hinge.

[0025] The beneficial effect is to realize the multi-stage adjustment of the arc formation of the flexible shaft roller path. Before the arc formation, first adjust the position of the swing arm to reduce the lifting stroke of the lead screw, and then accurately form the arc through the height adjustment mechanism, further improving the ability of the flexible shaft roller path to form a smaller radius arc and expanding the range of the arc radius.

[0026] Further, the upper hinge and the lower hinge are spherical plain bearings or hinge seats.

[0027] The beneficial effect is to give the structural form of the hinge, which can be selected according to the actual situation.

[0028] The present utility model further provides a positive and negative bending forming device, which includes a plurality of arc-changing units arranged at intervals along the glass conveying direction, and the arc-changing unit is the above-mentioned positive and negative bending arc-changing unit.

[0029] Its beneficial effects are as follows: Each positive and negative bending arc-changing unit can form an arc independently, so that multiple positive and negative bending arc-changing units can cooperate to achieve different functions. For example, when the arc-changing radian of multiple positive and negative bending arc-changing units is the same, it can be used in the stable section of bent glass production to stabilize the shape of the already bent glass; when the arc-changing radian of multiple positive and negative bending arc-changing units gradually changes along the glass conveying direction, it can be used in the gradual change section of bent glass production, so that the glass gradually forms when passing through. This equipment can be used for both positive arc forming and negative arc forming, with a wider range of equipment applications and a wider range of glass arc radii. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of the arc-changing unit in the prior art;

[0032] Figure 2 It is a schematic structural diagram of the positive and negative bending arc-changing unit described in the present invention in Embodiment 1;

[0033] Figure 3 It is a schematic structural diagram of the positive and negative bending arc-changing unit described in the present invention in Embodiment 2;

[0034] Figure 4 It is a schematic diagram of the first structure of the positive and negative bending arc-changing unit described in the present invention in Embodiment 3;

[0035] Figure 5 It is a schematic diagram of the second structure of the positive and negative bending arc-changing unit described in the present invention in Embodiment 3;

[0036] Figure 6 It is a schematic diagram of the third structure of the positive and negative bending arc-changing unit described in the present invention in Embodiment 3;

[0037] Figure 7 It is a three-dimensional view of the third structure of the positive and negative bending arc-changing unit described in the present invention in Embodiment 3;

[0038] Figure 8 It is a schematic diagram of the state of the positive and negative bending arc-changing unit described in the present invention in Embodiment 3 after negative arc forming;

[0039] Figure 9 It is a schematic diagram of the force condition at the upper hinge when the outermost screw rod in the positive and negative bending arc-changing unit described in the present invention is in the vertical state as the initial state and during negative arc forming;

[0040] Figure 10 Schematic diagram of the force condition at the upper hinge when the outermost screw rod in the positive and negative bending arc-changing unit of the present utility model is in an inclined state as the initial state and is bent into an arc in the reverse direction;

[0041] Figure 11 Schematic diagram of the force condition at the upper hinge when the outermost screw rod in the positive and negative bending arc-changing unit of the present utility model is in a vertical state as the initial state and is bent into an arc in the positive direction;

[0042] Figure 12 Schematic diagram of the force condition at the upper hinge when the outermost screw rod in the positive and negative bending arc-changing unit of the present utility model is in an inclined state as the initial state and is bent into an arc in the positive direction;

[0043] Markings in the figure: 1. Flexible shaft roller path, 2. Flexible shaft support, 3. Support square tube, 4. Screw rod, 5. Driving mechanism, 6. Hinge seat, 7. Upper hinge, 8. Lower support assembly, 801. Long strip-shaped slot, 9. Lower hinge, 10. Middle support assembly, 11. Elastic member. Specific implementation mode

[0044] The following further elaborates on the present utility model in conjunction with the accompanying drawings and embodiments, but it is not used as a basis for any limitation to the utility model.

[0045] Embodiment 1: As Figure 2 shown, a positive and negative bending arc-changing unit includes a flexible shaft roller path 1, a flexible shaft support 2, a support assembly, and a height adjustment mechanism. The support assembly includes a lower support assembly 8 and a middle support assembly 10. A plurality of flexible shaft supports 2 are arranged at intervals along the length direction of the flexible shaft roller path 1. The flexible shaft roller path 1 can rotate on the flexible shaft supports 2. The flexible shaft roller path 1 includes a flexible shaft and a plurality of rollers for conveying glass installed on the flexible shaft. The height adjustment mechanism includes a screw rod 4 and a driving mechanism 5 for driving the screw rod 4 to lift and lower. The driving mechanism 5 is rotatably installed on the lower surface of the lower support assembly 8 through a lower hinge 9. The screw rod 4 passes through the lower support assembly 8. The top end of the screw rod 4 is connected to the flexible shaft support 2 through an upper hinge 7. The driving mechanism 5 drives the screw rod 4 to lift and lower, and the screw rod 4 drives the flexible shaft roller path 1 to bend upward or downward, realizing the positive bending or reverse bending of the flexible shaft roller path 1. While the screw rod 4 is lifting and lowering, the top end of the screw rod 4 and the upper hinge 7 can rotate accordingly, and the driving part of the height adjustment mechanism 5 and the lower hinge 9 can also rotate accordingly, thereby increasing the bending degree of the positive bending and reverse bending to form glass with a smaller radius.

[0046] In this embodiment, the middle support assembly is vertically connected to the upper surface of the lower support assembly 8 and is located in the middle of the lower support assembly 8, forming an inverted T-shaped support structure. Alternatively, the lower end surface of the middle support assembly can also be flush with the lower surface of the lower support assembly.

[0047] In this embodiment, when the flexible shaft roller path 1 is in a flattened state, the lead screws 4 in all the height adjustment mechanisms are in a vertical state. During the reverse bending process, the lead screw 4 descends and rotates simultaneously to be inclined. The smaller the radius of the reverse bending arc, the shorter and more inclined the lead screw 4 is. The lead screw 4 closer to the end of the flexible shaft roller path 1 is shorter and more inclined. The "length of the lead screw" here refers to the length of the part of the lead screw 4 between the flexible shaft roller path 1 and the lower support assembly 8. Therefore, when forming a small-radius arc by reverse bending, if there is not enough reverse bending space, the outermost lead screws 4 at both ends of the flexible shaft roller path 1 and the two ends of the flexible shaft roller path 1 may touch the lower support assembly 8, preventing further reverse bending and affecting the rotation of the flexible shaft roller path 1.

[0048] Therefore, the forward and reverse bending variable arc unit of the present utility model combines with the length of the flexible shaft roller path to provide an effective reverse bending space. The middle support assembly 10 provides a reverse bending space for the reverse bending of the flexible shaft roller path 1, enabling reverse bending on the basis of forward bending and expanding the functions of the equipment.

[0049] The reverse bending space refers to the space between the flexible shaft roller path 1 and the lower support assembly 8 when the flexible shaft roller path 1 is in a flattened state. Since the middle of the flexible shaft roller path 1 is supported on the middle support assembly 10 and does not participate in arc variation, the distance from the middle axis of the flexible shaft roller path 1 to the upper surface of the lower support assembly 8 can be used as the height of the reverse bending space. As Figure 2 shown, let the height of the reverse bending space be H, and let the length of the flexible shaft roller path 1 be L. Theoretically, when the length of the flexible shaft roller path 1 is L, the minimum radius R formed by the flexible shaft roller path 1 at this time min , that is, when the flexible shaft roller path forms a semi-circle, R min =L / π. In order to be able to perform reverse bending, in this embodiment, 0.3L / π ≤ H ≤ 2L / π for the reverse bending space. By defining the relationship between the reverse bending space and the length of the flexible shaft roller path, the variable arc unit can not only form an arc by forward bending but also form an arc by reverse bending, and the radius range of the formed arc glass is wider.

[0050] In terms of the selection of the height of the reverse bending space, when H < 0.3L / π, the reverse bending space is too small, and the degree of reverse bending of the flexible shaft is small, which is of little significance for the reverse bending production of the equipment. When H > 2L / π, the length of the lead screw to be configured is too long, which has an adverse impact on the stability and durability of the lead screw structure. Therefore, preferably, 0.3L / π ≤ H ≤ 2L / π for the reverse bending space. Specifically, in this embodiment, H = 0.3L / π is selected. At this time, the variable arc unit can achieve a certain reverse bending arc on the basis of being able to perform forward bending and form glass with a certain radius by reverse bending.

[0051] In this embodiment, the upper hinge member 7 and the lower hinge member 9 can be spherical plain bearings or hinge seats.

[0052] In this embodiment, the driving mechanism includes a motor and a transmission speed reducer. The motor transmits power to the lead screw through the transmission speed reducer, and the transmission speed reducer is connected to the lower support assembly through a lower hinge. The main body of the lower support assembly can be selected as a support square tube. The lower hinge can be a hinge seat, and the transmission speed reducer is hinged to the hinge seat. Alternatively, the driving mechanism can also be a through-shaft motor with a lead screw nut built-in that can transmit power to the lead screw, and this motor is hinged to the hinge seat.

[0053] In this embodiment, a slot for the lead screw 4 to pass through is provided on the lower support assembly 8. The slot is elongated to allow the lead screw 4 to swing within a certain range. Alternatively, the lower support assembly 8 is a hollow structure, and the lead screw 4 can pass through the hollow structure and can swing relative to it.

[0054] In this embodiment, the middle support assembly 10 is vertically connected to the lower support assembly 8.

[0055] In this embodiment, the distance between two adjacent lead screws is 400 mm - 500 mm. This arrangement of the lead screw spacing makes the distribution of the arc-changing points of the soft-axis roller path driven by the lead screw more reasonable, and makes the arc of the soft-axis roller path more smooth. Specifically, the distance between the two lead screws is selected to be 400 mm or 500 mm.

[0056] Embodiment 2: As Figure 3 shown, compared with Embodiment 1, the difference in this embodiment is that the positive and negative bending arc-changing unit further includes an elastic member 11. The elastic member 11 is clamped between the soft-axis support 2 and the upper hinge 7, and the middle part of the elastic member 11 is fixed on the middle support assembly 10 or on the soft-axis middle transmission mechanism on the middle support assembly. During the lifting process of the lead screw 4, the soft-axis roller path 1 bends into an arc synchronously with the bending of the elastic member 11. The setting of the elastic member 11 makes the soft-axis roller path 1 smoother after bending into an arc, which helps to improve the arc-forming accuracy and quality of the bent glass.

[0057] The elastic member 11 can be selected as a spring steel plate or spring steel wire. When using spring steel wire, generally multiple spring steel wires are used side by side as an elastic member 11.

[0058] In this embodiment, H = 1L / π is selected. At this time, on the basis of being able to achieve positive bending, the arc-changing unit can achieve a large range of reverse bending, and can reverse-bend and form glass with different radii in a large range, and the reverse-bending radius of the formed glass is smaller.

[0059] In other embodiments, H = 2L / π is selected. At this time, on the basis of being able to achieve positive bending, the arc-changing unit can achieve an even larger range of reverse bending, and can reverse-bend and form glass with different radii in a larger range, and the reverse-bending radius of the formed glass is smaller, but the requirement for the lead screw selection is higher.

[0060] Embodiment 3: This embodiment is further optimized on the basis of Embodiment 1, and three structures of positive and negative bending arc changing units are proposed. The difference between each structure and Embodiment 1 is introduced below.

[0061] The first structure is Figure 4 As shown, in the forward and reverse bending arc changing unit, the flexible shaft roller is in the initial flattened state, the outermost screw rods 4 at both ends of the flexible shaft roller 1 are in an inclined state after the flexible shaft roller 1 is flattened, and the angle θ formed between the screw rod 4 and the horizontal direction is less than 90°, and the lower end of the screw rod 4 is biased toward the middle of the flexible shaft roller 1, that is, biased toward the middle support assembly 10. The other screw rods 4 are still arranged vertically, that is, the other screw rods 4 are perpendicular to the flattened flexible shaft roller 1.

[0062] exist Figure 4 Based on the first structure, the positive and negative bending arc changing unit can also adopt the following Figure 5 In the second structure shown, except for the two outermost screw rods 4, the other screw rods 4 are also inclined, and the angle θ between the screw rods 4 and the horizontal direction is larger as the screw rods 4 are closer to the middle support assembly 10. Furthermore, the screw rods 4 on the left and right sides of the middle support assembly 10 are symmetrically distributed.

[0063] exist Figure 5 On the basis of Figure 6 The third structure shown in the figure adopts the elastic member 11 as described in the second embodiment, and the connection position of the upper hinge member 7 on the elastic member 11 is staggered with the adjacent flexible shaft support 2.

[0064] like Figure 7 As shown, in the third structure, the lower support assembly 8 is provided with an elongated slot 801, and the screw rod 4 passes through the elongated slot 801. The elastic member 11 is three parallel spring steel wires, and the elastic member 11 is connected to a flexible shaft roller 1 through a set of flexible shaft supports 2.

[0065] In the three structures of this embodiment, the screw rods at both ends of the flexible shaft roller are tilted in the initial state. The tilted setting of the screw rod 4 can further increase the deformability of the reverse bending, so as to form glass with a smaller radius and be compatible with positive bending. Figure 8 shown.

[0066] The following takes Example 3 as an example to explain the principle that the outermost screw rod 4 which is inclined in the initial state of the flexible shaft roller being flat can increase the degree of deformation of the flexible shaft roller 1 in the reverse bending.

[0067] like Figure 9 , 10As shown in the figure, define the angle between the tangent line corresponding to the arc-changing point where the lead screw 4 and the elastic member 11 intersect as α. The arc-changing point on the elastic member 11 can be understood as the connection position between the upper hinge member 7 and the elastic member 11. The elastic member 11 is parallel to the flexible shaft roller path 1. The elastic member 11 changes its arc and synchronously drives the flexible shaft roller path 1 to change its arc through the flexible shaft support 2. The magnitude of the angle α is positively correlated with the thrust force in the moving direction of the elastic member 11 driven by the lead screw. When the angle α decreases to 0°, the component force F1 of the lead screw 4 in the moving direction of the elastic member 11 is zero. At this time, when the lead screw 4 continues to descend, it cannot drive the elastic member and the flexible shaft roller path 1 to change their arcs further. The degree to which the flexible shaft roller path 1 can change its arc theoretically reaches the maximum. However, in fact, because the lead screw has to overcome the rigidity of the elastic member and the flexible shaft roller path itself to change the arc, when the angle α approaches 0°, the degree of arc change has already reached the maximum.

[0068] Figure 9 、 10 When the flexible shaft roller path 1 is in the initial flattened state, when the angle θ of the lead screw 4 is 90° and when the angle θ < 90°, respectively, when the elastic member 11 bends and changes its arc to the same radius (that is, when the flexible shaft roller path 1 bends and changes its arc to the same radius), the magnitude of the angle α and the force-bearing situation at the arc-changing point on the elastic member 11 are given as follows.

[0069] (1) Figure 9 In the figure, in the initial state, the angle θ between the lead screw 4 and the horizontal direction is 90°. During the process of bending and changing its arc, the lead screw 4 descends, and the tangent angle α between the lead screw 4 and the arc-changing point on the elastic member 11 decreases, and the degree of decrease is severe. The component force F1 of the lead screw 4 in the moving direction of the elastic member 11 becomes smaller and smaller, while the force required for the elastic member 11 and the flexible shaft roller path 1 to bend increases more and more as the degree of bending increases. When the lead screw 4 moves to a certain angle, its component force F1 is not sufficient to continue driving the elastic member 11 and the flexible shaft roller path 1 to bend, that is, the degree of bendable during reverse bending is small, the radius specifications of the glass that can be reverse-bent are few, and the demand for reverse-bending glass with a smaller radius cannot be met. Specifically, as Figure 9 shown, after the arc change, both the elastic member 11 and the lead screw 4 are represented by dotted lines. When the elastic member 11 changes its arc to the radius R1, α = 10.26°. At this time, the component force F1 of the lead screw 4 in the moving direction of the elastic member 11 is small, and the amplitude that can continue to drive the flexible shaft roller path 1 to reverse-bend into an arc is small.

[0070] (2)In Figure 10 the figure, in the initial state, the angle θ between the lead screw 4 and the horizontal direction is θ < 90°, for example, 78.57° in the figure. During the process of bending and changing its arc, the lead screw 4 descends, and the tangent angle α between the lead screw 4 and the arc-changing point on the elastic member 11 first reaches 90°, and then gradually becomes smaller, and the decrease is slower. Specifically, as Figure 10As shown, when the elastic member 11 changes its arc to a radius R1, α = 34.16°. Compared with case (1), the angle α is larger. Therefore, at this time, the component force F1 of the lead screw 4 in the movement direction of the elastic member 11 is also larger, and the amplitude of the soft shaft roller path 1 that can be driven to continue to bend into an arc is also larger, so that it can be bent into an arc with a smaller radius.

[0071] From the above analysis of the reverse bending and arc changing, when the angle θ of the outermost lead screw at the initial state is less than 90°, during the arc changing process, the angle α between the lead screw 4 and the tangent of the elastic member 11 decreases relatively slowly. When the elastic member changes its arc to an equal radius (i.e., when the soft shaft roller path changes its arc to an equal radius), it can provide a larger component force in the movement direction of the elastic member. The degree to which the elastic member drives the soft shaft roller path to change its arc is greater, and the formed radius is smaller. Under the same output torque of the driving mechanism 5, the component force of the lead screw in the movement direction of the elastic member is sufficient to make the soft shaft roller path 1 continue to bend, and a smaller bending radius can be obtained.

[0072] According to the above analysis, within a certain range, the smaller the angle θ between the lead screw 4 and the horizontal direction at the initial state, the smaller the radius of the glass that can be reversely bent and formed. However, this angle is not the smaller the better, because too small an angle will affect the ability of the elastic member and the soft shaft roller path 1 to bend into an arc in the positive direction. Therefore, in order to reduce the influence on the positive bending of the soft shaft roller path 1 into an arc, it is preferably 70° ≤ θ ≤ 85°. The following combines Figure 11 , 12 , and respectively analyzes the magnitude of the angle α and the force condition at the arc changing point of the elastic member 11 when the angle θ between the lead screw 4 and the horizontal direction is 90° and the angle θ < 90° at the initial state, and when the elastic member 11 bends and changes its arc to a certain radius (i.e., when the soft shaft roller path 1 bends and changes its arc to the same radius), to illustrate the selection of this angle.

[0073] (1) Figure 11 , at the initial state, the angle θ between the lead screw 4 and the horizontal direction is 90°. During the process of positive bending and arc changing, the angle α between the lead screw 4 and the tangent at the arc changing point of the elastic member 11 decreases slowly. Specifically, when the elastic member 11 changes its arc to a radius R2, α = 43.41°, and the component force of the lead screw 4 in the movement direction of the elastic member 11 is sufficient to make the elastic member 11 drive the soft shaft roller path 1 to continue to bend.

[0074] (2) Figure 12, in the initial state, the included angle θ between the lead screw 4 and the horizontal direction is 78.57°. During the process of positive bending and arc formation, the included angle α between the lead screw 4 and the tangent line at the arc-forming point of the elastic member 11 decreases, and the decreasing amplitude of the included angle α is greater than that in case (1). Specifically, when the elastic member 11 forms an arc to a radius R2, α = 35.99°. The component force of the lead screw 4 in the moving direction of the elastic member 11 is sufficient to drive the soft shaft roller path 1 to continue bending by the elastic member 11, but its component force is smaller than the component force of the lead screw 4 in the moving direction of the elastic member 11 in case (1). This shows that the inclination angle of the lead screw 4 in the initial state has a certain influence on the positive bending and arc formation of the elastic member and the soft shaft roller path 1, but the influence is small.

[0075] From the above analysis of positive bending and arc formation, the larger the included angle θ of the lead screw 4 in the initial state, the more beneficial it is to positive bending and arc formation, and the greater the degree of arc formation, the smaller the radius of the positive-bent glass that can be formed. When it comes to reverse bending and arc formation, the smaller the θ angle of the lead screw 4 in the initial state, the more beneficial it is to reverse bending and arc formation, and the greater the degree of arc formation, the smaller the radius of the reverse-bent glass that can be formed. However, in order to better accommodate the positive bending and arc formation and reverse bending and arc formation of the soft shaft roller path 1, it is preferably 70° ≤ θ ≤ 85°. At this time, the radius of the glass formed by reverse bending is smaller, and it has little influence on positive bending and arc formation, taking both positive bending and reverse bending into account. In this embodiment, Figures 4 - 7 In the three structures shown, the included angles θ between the outermost lead screws at both ends of the soft shaft roller path and the horizontal direction are respectively selected as 70°, 78°, and 85°, and both can relatively well achieve reverse bending and arc formation on the basis of achieving positive bending and arc formation.

[0076] Figure 9 、 10 The analysis of 11 and 12 is carried out on the basis that the arc-forming unit contains an elastic member. For the arc-forming unit without an elastic member, the outermost lead screw of the soft shaft roller path is inclined in the initial state as described above. Compared with the outermost lead screw being vertically arranged in the initial state, it can also provide a greater component force in the moving direction of the soft shaft roller path when forming an arc to an equal radius, and the formed radius is smaller.

[0077] Embodiment 4: The positive and reverse bending and arc-forming unit of this embodiment optimizes the structure of the lower support assembly 8 on the basis of the above embodiment. The optimized lower support assembly 8 includes a left swing arm and a right swing arm. The inner ends of the left swing arm and the right swing arm are respectively hinged on both sides of the middle support assembly 10. The height adjustment mechanism is arranged on the left swing arm and the right swing arm. The left swing arm and the right swing arm are respectively controlled by corresponding swing arm driving mechanisms. At this time, the middle support assembly 10 is not vertically connected to the lower support assembly 8, and the lower end surface of the middle support assembly 10 can also be flush with the lower end surface of the lower support assembly 8.

[0078] During the process of arc variation, the positions of the left swing arm and the right swing arm can be adjusted by swinging first, so as to change the initial heights of the height adjustment mechanism and the end of the flexible shaft roller path 1. Then, the flexible shaft roller path 1 can be accurately formed into an arc through the height adjustment mechanism, further expanding the range of the arc forming radius of the positive and negative bending arc variation unit. Curved glass with a smaller radius for reverse bending forming and positive bending forming can be formed. And under the condition of the same arc forming radius, the stroke of the lead screw 4 can be reduced.

[0079] Specifically, by swinging to adjust the positions of the left swing arm and the right swing arm, before the height adjustment structure drives the lead screw to drive the elastic member and the flexible shaft roller path to be accurately formed into an arc, the angle of the lead screw is adjusted by the left swing arm and the right swing arm first, so as to further improve the arc variation ability of the positive and negative bending arc variation unit.

[0080] Embodiment 5: A positive and negative bending forming device includes a plurality of positive and negative bending arc variation units as described in the above embodiments, and the plurality of positive and negative bending arc variation units are arranged at intervals along the glass conveying direction. When the arc variation radian of the plurality of positive and negative bending arc variation units is the same, it can be used for the stable section of bent glass production to stabilize the shape of the already bent glass; when the arc variation radian of the plurality of positive and negative bending arc variation units gradually changes along the glass conveying direction, it can be used for the gradual change section of bent glass production, so that the glass is gradually formed when passing through.

[0081] By using a plurality of positive and negative bending arc variation units, the device can be used for both positive bending into an arc and reverse bending into an arc, with a wider range of uses for the device and a wider range of glass arc forming radii.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Those of ordinary skill in the art should understand that the specific implementation manners of the present invention can be modified or equivalently replaced by referring to the above embodiments. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention is within the scope of the claims pending for approval.

Claims

1. A positive and negative bending arc-changing unit, comprising a flexible shaft roller path, a support assembly and a plurality of height adjustment mechanisms. The flexible shaft roller path is supported above the support assembly by the plurality of height adjustment mechanisms, and is characterized in that: The support assembly includes a lower support assembly and a middle support assembly; the height adjustment mechanism includes a driving mechanism and a lead screw. The driving mechanism is connected to the lower support assembly through a lower hinge, and the top of the lead screw is connected to the flexible shaft roller path through an upper hinge. An activity space for the lead screw to pass through and swing is provided on the lower support assembly. When the flexible shaft roller path is in the initial flattened state, the space between the middle of the flexible shaft roller path and the lower support assembly is defined as the reverse bending space. Let the height of the reverse bending space be H and the length of the flexible shaft roller path be L, then 0.3L / π ≤ H ≤ 2L / π.

2. The positive and negative bending variable arc unit according to claim 1, characterized in that: When the flexible shaft roller path is in the initial flattened state, let the angle between the lead screw and the horizontal direction be θ, and the angle between each lead screw and the horizontal direction is θ ≤ 90°. The outermost lead screws at both ends of the flexible shaft roller path are inclined and θ < 90°, and the lower ends of the outermost lead screws are biased towards the middle support assembly.

3. The positive and negative bending variable arc unit according to claim 2, wherein: The plurality of lead screws are all inclined, and the angle θ between the lead screw closer to the middle support assembly and the horizontal direction is larger.

4. The positive and negative bending variable arc unit according to claim 2 or 3, characterized in that: The angle between the outermost lead screws at both ends of the flexible shaft roller path and the horizontal direction is 70° ≤ θ ≤ 85°.

5. The positive and negative bending variable arc unit according to claim 1 or 2 or 3, characterized in that: It further includes an elastic member and a flexible shaft support. The elastic member is arranged parallel to the flexible shaft roller path. The flexible shaft roller path is fixed on the elastic member through the flexible shaft support, and the elastic member is connected to the lead screw through the upper hinge.

6. The positive and negative bending variable arc unit according to claim 2 or 3, characterized in that: The distance between two adjacent lead screws is 400 mm - 500 mm.

7. The positive and negative bending variable arc unit according to claim 1 or 2 or 3, characterized in that: The lower support assembly includes a left swing arm and a right swing arm. The inner ends of the left swing arm and the right swing arm are respectively hinged on both sides of the middle support assembly; the left swing arm and the right swing arm are connected to the driving mechanism of the height adjustment mechanism through the lower hinge.

8. The positive and negative bending variable arc unit according to claim 1, characterized in that: The upper hinge and the lower hinge are spherical plain bearings or hinge seats.

9. A positive and negative bending forming device, comprising a plurality of variable arc units arranged at intervals along the glass conveying direction, characterized in that: The arc-changing unit is the positive and negative arc-changing unit according to any one of claims 1-8.

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