阅读说明：本技术 张紧装置、热弯机构及热弯机 (Tensioning device, hot bending mechanism and hot bending machine ) 是由 李青 李赫然 米军哲 于 2020-07-20 设计创作，主要内容包括：本公开涉及一种张紧装置、热弯机构及热弯机,张紧装置包括驱动单元、间隔且相对设置的第一张紧轴及第二张紧轴,第一张紧轴和第二张紧轴用于固定柔性压件的两端,驱动单元用于同步驱动第一张紧轴和第二张紧轴反向转动,和/或驱动第一张紧轴和第二张紧轴相互远离,以用于实现对柔性压件的张紧。通过驱动单元同步驱动第一张紧轴和第二张紧轴反向转动,和/或驱动第一张紧轴和第二张紧轴相互远离,以用于实现对柔性压件的张紧。在对玻璃进行包覆热弯过程中,因第一张紧轴和第二张紧轴同步转动或相互远离而不会出现因局部摩擦力或者局部阻力过大而导致的玻璃与模具、玻璃与柔性压件发生相对滑动,避免玻璃表面出现划擦质量缺陷,提高玻璃生产的良品率。(The utility model relates to a overspeed device tensioner, hot curved mechanism and hot bender, overspeed device tensioner include drive unit, interval and relative first tensioning axle and the second tensioning axle that sets up, first tensioning axle and second tensioning axle are used for the both ends of fixed flexible casting die, and drive unit is used for synchronous drive first tensioning axle and second tensioning axle antiport, and/or drive first tensioning axle and second tensioning axle keep away from each other for the tensioning of realization to flexible casting die. The first tensioning shaft and the second tensioning shaft are driven to rotate reversely through the driving unit synchronously, and/or the first tensioning shaft and the second tensioning shaft are driven to be away from each other so as to tension the flexible pressing piece. In the process of cladding and hot bending the glass, the first tensioning shaft and the second tensioning shaft synchronously rotate or are far away from each other, so that the glass and the die, the glass and the flexible pressing piece can not slide relatively due to local friction or overlarge local resistance, the quality defect of scratching on the surface of the glass is avoided, and the yield of glass production is improved.)

1. A tensioning device, characterized in that the tensioning device comprises a driving unit (1), a first tensioning shaft (2) and a second tensioning shaft (3) which are arranged at intervals and oppositely, the first tensioning shaft (2) and the second tensioning shaft (3) are used for fixing a flexible pressing piece (10),

the driving unit (1) is used for synchronously driving the first tensioning shaft (2) and the second tensioning shaft (3) to reversely rotate and/or driving the first tensioning shaft (2) and the second tensioning shaft (3) to be away from each other so as to tension the flexible pressing piece (10).

2. Tensioner according to claim 1, wherein said first tensioning shaft (2) and said second tensioning shaft (3) are parallel to each other, said tensioner being of symmetrical configuration with respect to a median parallel between the line on which said first tensioning shaft (2) is located and the line on which said second tensioning shaft (3) is located.

3. Tensioner according to claim 1, characterized in that it further comprises a mounting bracket (4), said mounting bracket (4) being used for mounting said drive unit (1) and/or said first tensioning shaft (3) and said second tensioning shaft (3).

4. A tensioning device according to claim 3, characterized in that the mounting frame (4) is located between the first tensioning shaft (2) and the second tensioning shaft (3), the drive unit (1) comprises a slide part, two four-bar linkages arranged at both ends of the two tensioning shafts, respectively, each four-bar linkage comprising a first (12), a second (13), a third (14) and a fourth (15) connecting to each other, and a drive source (11),

one end of each of the first connecting rod (12) and the second connecting rod (13) is hinged to the mounting frame (4), the other end of each of the first connecting rod and the second connecting rod is hinged to the first tensioning shaft (2) and the second tensioning shaft (3), one end of each of the third connecting rod (14) and the fourth connecting rod (15) is hinged to the sliding block portion, and the other end of each of the third connecting rod and the fourth connecting rod is fixedly connected to the first tensioning shaft (2) and the second tensioning shaft (3),

the driving source (11) is used for driving the sliding block part to drive the connecting rods in the four-bar linkage mechanism to rotate, so that the first tensioning shaft (2) and the second tensioning shaft (3) rotate to wind the flexible pressing piece (10), and the first tensioning shaft (2) and the second tensioning shaft (3) are far away from each other.

5. The tensioning device according to claim 4, characterized in that said slider portion comprises a sliding rod (16) and a slider (17), said sliding rod (16) being connected to said mounting frame (4), said slider (17) being slidably sleeved on said sliding rod (16).

6. A tensioner according to claim 5, characterised in that the drive source (11) comprises a resilient member for applying a resilient force to the slider (17) away from the mounting frame (4).

7. A tensioning device according to claim 3, characterized in that both ends of the first tensioning shaft (2) and the second tensioning shaft (3) are intended to be articulated with the mounting (4), the drive unit (1) comprising at least a first counterweight at one of its ends and at least a second counterweight at one of its ends of the second tensioning shaft (3),

the first counterweight part comprises a first counterweight block (101) and a first counterweight arm (102) arranged along the radial direction of the first tensioning shaft (2), the first counterweight arm (102) is hinged to the mounting frame (4) through a hinge point between two ends of the first counterweight arm, one end of the first counterweight arm (102) is used for being fixedly connected with the end part of the first tensioning shaft (2), and the other end of the first counterweight arm is used for being connected with the first counterweight block (101),

the second counter weight portion includes second balancing weight (111) and follows second counter weight arm (112) of second tensioning axle (3) radial arrangement, second counter weight arm (112) through the pin joint between its both ends articulate in mounting bracket (4), the one end of second counter weight arm (112) be used for with the end fixed connection of second tensioning axle (3), the other end is used for connecting second balancing weight (111).

8. Tensioner according to claim 7, characterized in that said drive unit (1) comprises two said first counterweights at the two ends of said first tensioning shaft (2) respectively, and two said second counterweights at the two ends of said second tensioning shaft (3) respectively,

be located the same one end of two tensioning shafts first balancing weight (101) of first counter weight portion with be provided with intermeshing's first sector gear (1011) and second sector gear (1111) on second balancing weight (111) of second counter weight portion respectively.

9. Hot bending device, characterized in that the hot bending device comprises a punch (20) with a forming arc (200), a flexible pressing member (10), a heating device and a tensioning device according to any one of claims 1 to 8,

the tensioning device is used for providing tensioning force to the flexible pressing piece (10) so as to keep the flexible pressing piece (10) in a tensioning state,

at least one of the tensioning device and the punch (20) being movable towards the other for enabling the flexible press (10) on the tensioning device and the forming arch (200) on the punch (20) to press the glass (100) placed on the forming arch (200) or on the flexible press (10),

the heating device is used for heating the flexible pressing piece (10) so as to enable the glass (100) to be heated, bent and attached to the forming arc surface (200).

10. A hot bending machine, characterized in that it comprises a hot bending mechanism according to claim 9.

Technical Field

The disclosure relates to the technical field of curved glass, in particular to a tensioning device, a hot bending mechanism and a hot bending machine.

Background

With the increasing development demands of industries such as smart phones, smart televisions and vehicle-mounted novel integrated central control display technologies, the curved screen display technology has frequent appearance and attractive appearance, so that the market demand is more and more extensive. The 3D curved glass required by the curved screen is used as the most critical part of the curved display technology, and the requirements on the production technology are higher and higher.

At present, the 3D curved glass has the disadvantages of high hot bending difficulty, complex method and low production efficiency, and one of the main problems corresponding to the method is high heat power consumption and low yield. The current heating method is to heat the mould and the glass integrally, the glass does not need to be heated to the maximum temperature at a hot bending part, and the problem of heat waste exists. In addition, the existing hot bending is generally formed by oppositely pressing an upper die and a lower die, the shape of the die is complex, the development cost is high, the glass quality is greatly influenced by the surface quality of the die, the matching precision of the upper die and the lower die, the abrasion of the die and the like due to the fact that the glass is formed by the extrusion of the upper die and the lower die, and the stability and the uniformity of the glass quality are difficult to stabilize.

In particular, in the process of cladding and hot bending the glass by the upper die and the lower die, the problem that the glass slides relative to the die and the glass slides relative to the flexible material often occurs, so that the quality defect of the glass surface is scratched smoothly.

Disclosure of Invention

The purpose of the disclosure is to provide a tensioning device, a hot bending mechanism and a hot bending machine, wherein the tensioning device can effectively avoid the problem of surface sliding quality defect in the process of cladding and hot bending glass.

In order to achieve the above object, the present disclosure provides a tensioning device, which includes a driving unit, a first tensioning shaft and a second tensioning shaft spaced and oppositely disposed, wherein the first tensioning shaft and the second tensioning shaft are used for fixing a flexible pressing member, the driving unit is used for synchronously driving the first tensioning shaft and the second tensioning shaft to reversely rotate, and/or driving the first tensioning shaft and the second tensioning shaft to be away from each other, so as to tension the flexible pressing member.

Optionally, the first tensioning axis and the second tensioning axis are parallel to each other, and the tensioning device is symmetrical about a middle parallel line between a line on which the first tensioning axis is located and a line on which the second tensioning axis is located.

Optionally, the tensioning device further comprises a mounting for mounting the drive unit and/or the first and second tensioning shafts.

Optionally, the mounting bracket is located between the first tensioning shaft and the second tensioning shaft, the driving unit includes a slider portion, two four-bar linkages respectively disposed at two ends of the two tensioning shafts, and a driving source, each four-bar linkage includes a first connecting rod, a second connecting rod, a third connecting rod and a fourth connecting rod connected to each other, one end of the first connecting rod and one end of the second connecting rod are all used for being hinged to the mounting bracket, the other end of the first connecting rod and the other end of the second connecting rod are respectively used for being hinged to the first tensioning shaft and the second tensioning shaft, one end of the third connecting rod and one end of the fourth connecting rod are used for being hinged to the slider portion, the other end of the third connecting rod and the other end of the fourth connecting rod are respectively used for being fixedly connected to the first tensioning shaft and the second tensioning shaft, the driving source is used for driving the slider portion to drive the connecting rods in the four-bar linkages to rotate so that the, And moving the first tensioning shaft and the second tensioning shaft away from each other.

Optionally, the sliding block portion comprises a sliding rod and a sliding block, the sliding rod is connected to the mounting frame, and the sliding block is slidably sleeved on the sliding rod.

Optionally, the driving source includes an elastic member for applying an elastic force to the slider away from the mount.

Optionally, both ends of the first tensioning shaft and the second tensioning shaft are configured to be hinged to the mounting frame, the driving unit includes a first weight portion at least located at one end of the first tensioning shaft and a second weight portion at least located at one end of the second tensioning shaft, the first weight portion includes a first weight block and a first weight arm radially disposed along the first tensioning shaft, the first weight arm is hinged to the mounting frame through a hinge point between both ends of the first weight arm, one end of the first weight arm is configured to be fixedly connected to an end of the first tensioning shaft, the other end of the first weight arm is configured to be connected to the first weight block, the second weight portion includes a second weight block and a second weight arm radially disposed along the second tensioning shaft, the second weight arm is hinged to the mounting frame through a hinge point between both ends of the second weight arm, one end of the second weight arm is configured to be fixedly connected to an end of the second tensioning shaft, the other end is used for connecting the second balancing weight.

Optionally, the drive unit includes two that are located respectively first tensioning shaft both ends first counter weight portion reaches two that are located respectively second tensioning shaft both ends second counter weight portion is located two same ends of tensioning shaft first counter weight portion's first balancing weight with be provided with intermeshing's first sector gear and second sector gear on the second balancing weight of second counter weight portion respectively.

The present disclosure also provides a hot bending mechanism, which includes a male mold having a forming curved surface, a flexible pressing member, a heating device, and the tensioning device, wherein the tensioning device is configured to provide a tensioning force to the flexible pressing member to keep the flexible pressing member in a tensioned state, at least one of the tensioning device and the male mold is movable toward the other one to enable the flexible pressing member located on the tensioning device and the forming curved surface on the male mold to press the glass placed on the forming curved surface or on the flexible pressing member, and the heating device is configured to heat the flexible pressing member to bend the glass and adhere to the forming curved surface.

The present disclosure additionally provides a hot bending machine, which includes the hot bending mechanism.

In the technical scheme, the driving unit is used for synchronously driving the first tensioning shaft and the second tensioning shaft to rotate reversely, and/or driving the first tensioning shaft and the second tensioning shaft to be away from each other so as to tension the flexible pressing piece. In the process of cladding and hot bending the glass, the first tensioning shaft and the second tensioning shaft synchronously rotate or are far away from each other, so that the glass and a mold, the glass and a flexible pressing piece can not slide relatively due to local friction or overlarge local resistance, the problem of scratching quality defects on the surface of the glass is avoided, and the yield of glass production is improved.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic view showing the structure of a hot bending mechanism disclosed in a first embodiment, in which a heating device is not shown and a flexible pressing member does not press glass on a male mold;

FIG. 2 is a schematic structural view of a hot bending mechanism according to a first embodiment of the present disclosure, in which a heating device is not shown, and a flexible pressing member is deformed and presses glass on a male mold;

FIG. 3 is a schematic block diagram showing the structure of a hot bending mechanism according to a second embodiment of the present disclosure, in which a heating device is not shown and a flexible pressing member does not press glass on a male mold, and a first sector gear and a second sector gear are also shown;

fig. 4 is a schematic structural view of a hot bending mechanism according to a second embodiment of the present disclosure, in which a heating device is not shown and a flexible pressing member is deformed and presses glass on a male mold, and a first sector gear and a second sector gear are also shown.

Description of the reference numerals

1 drive unit 11 drive source

12 first link 13 second link

14 third link 15 fourth link

16 slide bar 17 slide block

101 first counterweight block 102 first counterweight arm

111 second counterweight block 112 second counterweight arm

1011 first sector gear 1111 second sector gear

103 first rod 104 second rod

2 first tensioning axis 3 second tensioning axis

4 mounting frame 10 Flexible compression Member

20 punch 200 forming arc surface

100 glass 30 first drive device

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the use of the terms of orientation such as "upper" and "lower" generally means defined with reference to the direction of the drawing of the drawings; the use of terms such as "first," "second," etc. is intended merely to distinguish one element from another, and is not intended to be sequential or important.

As shown in fig. 1 to 4, the present disclosure provides a tensioning device, which includes a driving unit 1, a first tensioning shaft 2 and a second tensioning shaft 3 that are spaced and arranged oppositely, the first tensioning shaft 2 and the second tensioning shaft 3 are used for fixing two ends of a flexible pressing member 10, the driving unit 1 is used for synchronously driving the first tensioning shaft 2 and the second tensioning shaft 3 to rotate reversely, and/or driving the first tensioning shaft 2 and the second tensioning shaft 3 to move away from each other, so as to tension the flexible pressing member 10.

In the above technical solution, the driving unit 1 drives the first tensioning shaft 2 and the second tensioning shaft 3 to rotate in opposite directions synchronously, and/or drives the first tensioning shaft 2 and the second tensioning shaft 3 to move away from each other, so as to tension the flexible pressing member 10. The tensioning device can be applied to an over-molding hot bending mechanism. Firstly, the inventor of the present application finds that in the prior art, in the curved surface processing of glass by the concave-convex die matching manner, the research and development cost is high, the processing difficulty is high, and the precision is low, based on the technical background, the inventor of the present application abandons the manufacturing design of the concave die (not shown), creatively adopts the tensionable flexible pressing piece 10 to replace the concave die in the prior art, and because the flexible pressing piece 10 is made of a flexible material, the technical problem that the precision of the curved surface glass is low due to the fact that the radian of the curved surface cannot be ensured in the concave die does not occur. Further, during the hot bending process, the inventors found that the flexible compression element 10 may occur due to uneven or unsynchronized tension on both sides: the glass and the mould, and the glass and the flexible material slide relatively. Therefore, in the tensioning device designed by the inventor in the present application, the flexible pressing element 10 can effectively solve the technical problem when the first tensioning shaft 2 and the second tensioning shaft 3 are driven to rotate reversely and/or far away from each other synchronously. In the process of cladding and hot bending the glass, the flexible pressing piece 10 can be clad with the glass 100, so that the relative sliding between the glass and a mold and between the glass and the flexible pressing piece 10 caused by excessive local friction force or local resistance can be avoided, the problem of scratching quality defects on the surface of the glass 100 is avoided, and the yield of the glass 100 is improved.

Further, the first tensioning shaft 2 and the second tensioning shaft 3 are parallel to each other, and the tensioning device is symmetrical about a middle parallel line between a straight line on which the first tensioning shaft 2 is located and a straight line on which the second tensioning shaft 3 is located. When the flexible pressing piece 10 on the tensioning device applies force to the male die 20 in the hot bending mechanism, the top point of the male die 20 coincides with the middle parallel line, in the coating process, the flexible pressing piece 10 is firstly in full contact with the glass, and along with the continuation of the coating process, the contact position of the glass 100 with the male die 20 firstly begins to deform under the combined action of the male die 20 and the flexible pressing piece 10 until the glass is completely coated on the forming arc surface 200 of the male die 20. In the whole coating process, the tensioning device is of a symmetrical structure, so that the tension of the flexible pressing parts 10 positioned on the two sides of the top point of the male die 20 is the same, and the situation that the flexible pressing parts 10 slide due to the difference of the tension of the two sides of the top point of the male die 20 is avoided.

Referring to fig. 1 to 4, the tensioner may further include a mounting bracket 4, and the mounting bracket 4 may be used for mounting the driving unit 1 and/or the first tensioning shaft 2 and the second tensioning shaft 3, so as to provide a mounting base for the tensioner and ensure the structural stability and reliability of the tensioner. The mounting bracket 4 may be constructed in any suitable configuration and shape, as the present disclosure is not limited thereto.

In one embodiment, as shown in fig. 1 and 2, the mounting bracket 4 may be located between the first tensioning shaft 2 and the second tensioning shaft 3, and the driving unit 1 may include a slider portion, two four-bar linkages respectively disposed at both ends of the two tensioning shafts, each of the four-bar linkages including a first link 12, a second link 13, a third link 14, and a fourth link 15 connected to each other, and a driving source 11. One end of each of the first connecting rod 12 and the second connecting rod 13 is used for being hinged to the mounting frame 4, the other end of each of the first connecting rod 12 and the second connecting rod 13 is used for being hinged to the first tensioning shaft 2 and the second tensioning shaft 3, one end of each of the third connecting rod 14 and the fourth connecting rod 15 is used for being hinged to the sliding block portion, the other end of each of the third connecting rod 14 and the fourth connecting rod 15 is used for being fixedly connected with the first tensioning shaft 2 and the second tensioning shaft 3, and the driving source 11 is used for driving the sliding block portion to drive the connecting rods in the four-bar mechanism to rotate, so that the first tensioning shaft 2 and the second tensioning shaft 3 rotate to wind the flexible pressing.

In the above-described embodiments, the four-bar linkage may maintain a substantially constant tension on flexible compression element 10. The slide block part, the first connecting rod 12 and the third connecting rod 14 form a first crank slide block mechanism; the slide block part, the second connecting rod 13 and the fourth connecting rod 15 form a second crank slide block mechanism; the whole four-bar linkage mechanism can be ensured to have stable and accurate guidance. The mounting frame 4 serves as a mounting base for the integrated tensioning device and can be used for connection to a drive (not shown) in the hot bending machine for driving the tensioning device by means of the drive towards the punch. The drive source 11 is used to provide a substantially constant tension to the flexible compression element 10. Alternatively, the driving source 11 may be an elastic member, for example, the elastic member may be a compression spring. The present disclosure is not limited to a specific type of the driving source 11, and the driving source 11 may be configured as other types of elastic members; the driving source 11 may be not limited to the elastic member, and may be configured as a weight or the like.

In addition, the tension required by the flexible compression element 10 may vary depending on the shape, type, etc. of the article to be compressed by the flexible compression element 10. For example, the tension of the flexible compression element 10 may be adjusted by adjusting the amount of pre-tension compression of the compression spring such that the tension of the flexible compression element 10 is adjusted to the parameters of the article being compressed.

Further, referring to fig. 1 and 2, the sliding block portion may include a sliding rod 16 and a sliding block 17, the sliding rod 16 is connected to the mounting frame 4, and the sliding block 17 is slidably sleeved on the sliding rod 16. The driving source 11 may be configured as a compression spring and is sleeved on the sliding rod 16, and one end of the compression spring is used for abutting against the mounting frame 4, and the other end of the compression spring is used for abutting against the sliding block. The mounting frame 4 may be a long strip-shaped plate structure, and the long strip-shaped plate structure is parallel to the first tensioning shaft 2 and the second tensioning shaft 3. The slide bar 16 is vertically disposed below the elongated plate-like structure at a middle position thereof. The two four-bar linkage mechanisms are respectively positioned at two ends of the strip-shaped plate-shaped structure, one end of a first connecting rod 12 and one end of a second connecting rod 13 in the same four-bar linkage mechanism are hinged to the end part of the strip-shaped plate-shaped structure, and the other end of the first connecting rod 12 and the other end of the second connecting rod 13 are respectively hinged to the first tensioning shaft 2 and the second tensioning shaft 3. One end of the third link 14 and one end of the fourth link 15 in the same four-bar linkage are used for being hinged with the slide block 17, and the other ends are respectively used for being fixedly connected with the first tensioning shaft 2 and the second tensioning shaft 3, and the working process of the tensioning device in the embodiment is as follows:

the driving source 1 configured as a compression spring applies an elastic force to the sliding block 17, so that the sliding block 17 moves downwards along the sliding rod 16, and during the downward movement of the sliding block 17, on one hand, the third connecting rod 14 and the fourth connecting rod 15 drive the first tensioning shaft 2 and the second tensioning shaft 3 to rotate reversely to wind the flexible pressing piece 10, so that the flexible pressing piece 10 maintains a substantially constant tension; on the other hand, first link 12 and second link 13 rotate about mounting bracket 4 to move first tensioning shaft 2 and second tensioning shaft 3 away from each other to maintain a substantially constant tension in flexible compression element 10. It should be noted here that the third link 14 and the fourth link 15 can be made of elastic material capable of generating deformation so as to satisfy the requirement that the two links can still move along the sliding rod 16 during the rotation process.

The specific structure type of the slider portion is not limited to the slide bar 16 and the slider 17, and the slider portion may be configured in any suitable shape and structure, but the present disclosure is not limited thereto, and may be configured in a structure of a slide groove (not shown) or a slide groove block (not shown), for example.

In another embodiment, as shown in fig. 3 and 4, both ends of the first tensioning shaft 2 and the second tensioning shaft 3 are configured to be hinged to the mounting frame 4, the driving unit 1 includes a first weight portion located at least at one end of the first tensioning shaft 2 and a second weight portion located at least at one end of the second tensioning shaft 3, the first weight portion includes a first weight block 101 and a first weight arm 102 radially arranged along the first tensioning shaft 2, the first weight arm 102 is hinged to the mounting frame 4 through a hinge point between both ends of the first weight arm 102, one end of the first weight arm 102 is configured to be fixedly connected to an end of the first tensioning shaft 2, and the other end is configured to be connected to the first weight block 101. The second counter weight portion includes second balancing weight 111 and follows the second counter weight arm 112 of second tensioning axle 3 radial arrangement, and second counter weight arm 112 articulates in mounting bracket 4 through the pin joint between its both ends, and the one end of second counter weight arm 112 is used for the tip fixed connection with second tensioning axle 3, and the other end is used for connecting second balancing weight 111.

In this embodiment, when the first and second weights 101 and 111 are subjected to gravity, the first and second weight arms 102 and 112 rotate about their respective hinge points and apply a rotational torque to the first and second tensioning shafts 2 and 3, respectively, such that the first and second tensioning shafts 2 and 3 rotate or have a tendency to rotate to tension the flexible compression element 10 and maintain a substantially constant tension. Alternatively, the rotation shafts (not shown) at the two hinge points of the first and second weight arms 102 and 112 may be parallel to each other, for example, the two rotation shafts may be parallel to both the first and second tensioning shafts 2 and 3, so that the weight arms arranged radially along the tensioning shafts apply a rotational torque to the tensioning shafts.

The tension required by the flexible compression element 10 may vary depending on the shape, type, etc. of the article to be compressed by the flexible compression element 10. For example, in one aspect, the tension of the flexible compression element 10 may be adjusted by adjusting the weight of the weight block on the weight arm, such that the tension of the flexible compression element 10 is adapted to the parameters of the article being compressed; on the other hand, the rotating moment of the counterweight arm can be changed by adjusting the position of the counterweight block at the end part of the counterweight arm away from the hinge point, and the tension force of the flexible pressing piece 10 can also be adjusted.

Further, as shown in fig. 3 and 4, the driving unit 1 may include two first balance weights respectively located at two ends of the first tensioning shaft 2 and two second balance weights respectively located at two ends of the second tensioning shaft 3, and a first sector gear 1011 and a second sector gear 1111 engaged with each other are respectively disposed on the first counterweight block 101 of the first balance weight and the second counterweight block 111 of the second balance weight located at the same end of the two tensioning shafts. By the constraint of the first sector gear 1011 and the second sector gear 1111, the synchronism and interlocking of the movement of the first tensioning shaft 2 and the second tensioning shaft 3 which are symmetrical to each other can be ensured. The first tensioning shaft 2 and the second tensioning shaft 3 are not limited to the mechanical constraint of the first sector gear 1011 and the second sector gear 1111 that are engaged with each other, and may be two sets of mechanical structures that are symmetrical to each other, such as a crank block, a half gear, a rack and pinion, and the like. And the driving source 11 of the tensioner includes, but is not limited to, elastic force, gravity. The motion tracks of the two mandrils are synchronized or interlocked under the drive of a motor, pneumatic or hydraulic pressure and the like.

As shown in fig. 3 and 4, each of the first and second weight arms 102 and 112 may be configured as a bent rod structure connected at an angle by a first rod 103 and a second rod 104, the bent portion of the bent rod structure being used for hinging with the mounting frame 4, the end of the first rod 103 being used for fixedly connecting with the tension shaft, and the end of the second rod 104 being used for connecting with the weight block. The bent rod structure may be constructed as an integrally formed structure. The counterweight arm with the structure of the bending rod can effectively reduce the design space, and is convenient for the light weight design of the tensioning device. The present disclosure is not limited to a counterweight arm, however, which may be configured in any suitable shape and configuration.

In addition, as shown in fig. 1 to 4, the present disclosure also provides a hot bending mechanism, which includes a punch 20 having a forming arc 200, a flexible pressing member 10, a heating device (not shown), and the above-mentioned tensioning device, wherein the tensioning device is used for providing a tensioning force to the flexible pressing member 10 to keep the flexible pressing member 10 in a tensioned state, at least one of the tensioning device and the punch 20 is movable toward the other for enabling the flexible pressing member 10 on the tensioning device and the forming arc 200 on the punch 20 to press the glass 100 placed on the forming arc 200 or on the flexible pressing member 10, and the heating device is used for heating the flexible pressing member 10 to heat and bend the glass 100 and attach to the forming arc 200.

From the above, the tensioner can be implemented in many different ways, including but not limited to the four-bar linkage as shown in fig. 1 and 2, and the gravity swing arm structure as shown in fig. 3 and 4. The tensioning device can be installed in any direction regardless of the structure, and as shown in fig. 1 and 2, the tensioning device is arranged above the punch 20 and below the glass 100 (the glass is placed on the punch 20), or the punch 20 is arranged above the tensioning device and below the glass 100 (the glass is placed on the flexible pressing member 10 on the tensioning device), which is not limited by the disclosure.

The tensioning device is used to provide tension to flexible compression element 10, thereby maintaining flexible compression element 10 in a tensioned state. The initial state of flexible compression element 10 is under tension, which is parallel to glass 100. The tensioning device can be driven by a first driving device 30, the punch 20 can be driven by a second driving device (not shown) to enable the flexible pressing piece 10 on the tensioning device and the forming arc surface 200 on the punch 20 to move towards each other and contact the glass 100, the flexible pressing piece 10 is firstly in full contact with the glass 100, and the glass 100 is gradually bent and deformed under the combined pressure force of the flexible pressing piece 10 and the forming arc surface 200 as the opposite movement continues. In the bending deformation process, the flexible pressing piece 10 and the glass 100 are always kept in a full contact state, the part, inside the tangent point A, of the glass 100 and the forming arc surface 200 is in a full contact state with the forming arc surface 200, and the glass 100 is not in contact with the forming arc surface 200 beyond the tangent point A.

In addition, the first tensioning shaft 2 and the second tensioning shaft 3 can be installed in parallel and can adjust the parallelism, so that the stable tension and the uniform stress of the flexible pressing piece 10 are ensured. The first tensioning shaft 2 and the second tensioning shaft 3 are both cylindrical, two ends of the flexible pressing piece 10 are wound on the two tensioning shafts, and in the coating process, the flexible pressing piece 10 can be guaranteed to be in a tangent state with the tensioning shafts all the time, so that the tensioning force is uniform.

The present disclosure additionally provides a hot bending machine including the above hot bending mechanism.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.