Lifting appliance capable of automatically adjusting balance and balance lifting equipment

Abstract

The utility model provides an automatic balance adjusting lifting appliance for lifting and balance lifting equipment, and relates to the technical field of balance lifting equipment. The lifting automatic balance adjusting lifting appliance comprises a supporting main beam, at least two lifting hook mechanisms are installed on the supporting main beam in the length direction at intervals, a transmission frame is installed on the supporting main beam in a sliding mode through a driving mechanism, and the driving mechanism can drive the transmission frame to move in the length direction of the supporting main beam. Sliding grooves extending in the length direction of the supporting main beam are formed in the two ends of the supporting main beam respectively, sensors are installed at the ends, close to the supporting main beam, in the sliding grooves, elastic pieces are installed at the ends, away from the supporting main beam, in the sliding grooves, and sliding blocks capable of sliding in the sliding grooves are installed on the elastic pieces. Based on the technical scheme provided by the utility model, the lifting appliance capable of automatically adjusting the balance can automatically adjust the balance during lifting, so that the gravity center of a bamboo pole coincides with the lifting center line of the lifting appliance, and the lifting appliance and the bamboo pole are ensured to be in a horizontal state.

Description

Technical Field

[0001] The utility model relates to the technical field of balanced lifting equipment, in particular to a lifting automatic regulating balanced sling and balanced lifting equipment. Background Art

[0002] Bamboo is a tall tree-like grass plant. There are more than 70 genera and more than 1,000 species recorded, but many of them are synonyms. Bamboo is a tall, fast-growing grass plant with a wooden stem. It is distributed in tropical, subtropical and warm temperate regions. It is most concentrated in East Asia, Southeast Asia and the Indian Ocean, and has the most species. The above-ground stems of bamboo are wooden and hollow (we call them bamboo poles), which grow in clusters from the underground stems (rhizomes) of bamboo. In the process of processing bamboo poles, the transportation of bamboo poles is essential, and the bamboo poles need to be transported from the place of production back to the factory for processing.

[0003] The existing transportation method is to transport the bamboo poles to the factory by car, which requires a mobile gantry and a sling. The sling is equipped with a chain hook to lift the two ends of the bamboo and then place the bamboo in a preset position. In actual operations, the center of gravity of the bamboo pole often deviates from the lifting center line of the sling, causing the sling and the bamboo pole to be tilted too much, making it inconvenient to lift, and even causing damage to the bamboo pole. Generally, the lifting point of the lifting ring on the sling is manually changed to conduct repeated tests to re-determine the lifting point to ensure that the sling and the bamboo pole are in a horizontal state, which is very inconvenient to use and affects work efficiency.

[0004] Therefore, it is necessary to design a lifting automatic adjustment balance sling that can automatically adjust the balance during lifting so that the center of gravity of the bamboo pole coincides with the lifting center line of the sling, ensuring that the sling and the bamboo pole are in a horizontal state. Utility Model Content

[0005] In response to the problems in the above-mentioned prior art, the present application proposes a lifting automatic adjustment balance sling and a balanced lifting equipment, which can automatically adjust the balance during lifting so that the center of gravity of the bamboo pole coincides with the lifting center line of the sling, ensuring that the sling and the bamboo pole are in a horizontal state.

[0006] One aspect of the utility model provides an automatic adjusting balancing lifting sling, which includes a supporting main beam, at least two hook mechanisms are installed on the supporting main beam at intervals along the length direction, the two hook mechanisms are used to cooperate with each other to lift the objects to be lifted, a transmission frame is slidably installed on the supporting main beam through a driving mechanism, the driving mechanism can drive the transmission frame to move along the length direction of the supporting main beam, the transmission frame can be connected to the lifting equipment, and the two ends of the supporting main beam are respectively provided with sliding grooves extending along the length direction of the supporting main beam, a sensor is installed in the sliding groove at the end close to the supporting main beam, an elastic member is installed in the sliding groove at the end away from the supporting main beam, a sliding block that can slide in the sliding groove is installed on the elastic member, and when the sliding block and the sensor are close to a preset distance, the driving mechanism can be controlled to drive the transmission frame to move to adjust the balance of the supporting main beam.

[0007] As a further improvement of the above technical solution:

[0008] The above-mentioned lifting automatic adjusting balancing sling, further, is provided with support plates extending along the length direction of the support main beam on opposite sides of the support main beam, and pulleys are provided on opposite sides of the transmission frame, and the support plates on both sides are supported and placed on the pulleys on both sides in a one-to-one correspondence.

[0009] The above-mentioned lifting automatic adjusting balancing sling, further, has sealing plates installed at both ends of the supporting main beam, and the driving mechanism includes a threaded rod and a rotation driving assembly, the threaded rod can be rotatably arranged between the two sealing plates, the transmission frame is threadedly matched with the threaded rod, and the rotation driving assembly can drive the threaded rod to rotate, so as to drive the transmission frame to move along the length direction of the supporting main beam.

[0010] The above-mentioned lifting automatic adjusting balancing sling, further, a mounting beam is installed on the lower side of the supporting main beam, the mounting beam is arranged parallel to the supporting main beam, and the two hook mechanisms are both slidably installed on the mounting beam.

[0011] The above-mentioned lifting automatic adjusting balancing sling, further, has a slide groove on the mounting beam, the hook mechanism includes a support frame, a roller is rotatably mounted on the support frame, the roller is limitedly slid in the slide groove, and a hook is mounted on the lower side of the support frame.

[0012] The above-mentioned lifting automatic adjusting balancing sling, further, has a plurality of limit holes spaced apart along the length direction on the mounting beam, a mounting tube is installed on the support frame, a limit pin is slidably installed in the mounting tube, a limit block is provided on the side wall of the limit pin, the limit block is located in the mounting tube, a reset spring is sleeved on the limit pin, two ends of the reset spring are respectively abutted against the limit block and the top of the mounting tube, and the limit pin can be limited in the limit hole under the action of the reset spring.

[0013] The above-mentioned lifting automatic adjustment balancing sling, further, has the slide grooves on both sides of the upper surface and the lower surface of the mounting beam, and the four rollers are rotatably mounted on the support frame, and the four rollers are limitedly slid in the slide grooves in a one-to-one corresponding manner.

[0014] The above-mentioned lifting automatic adjusting balancing sling, further, has abutment wheels rotatably mounted on opposite sides of the sliding block, and the sliding block rolls against the side wall of the sliding groove through the abutment wheels.

[0015] The above-mentioned lifting automatic adjusting balancing sling, further, the transmission frame is installed with a shackle, and the transmission frame can be connected to the lifting equipment through the shackle.

[0016] Another aspect of the utility model provides a balanced lifting device, which comprises a lifting device and the above-mentioned automatic lifting and adjusting balancing sling, wherein the lifting device is connected to the transmission frame.

[0017] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the purpose of the utility model can be achieved.

[0018] The utility model provides an automatic adjustment balance sling for lifting and a balanced lifting device, which at least has the following beneficial effects compared with the prior art: when it is necessary to unload the bamboo pole from the transport vehicle, the transmission frame can be connected to the lifting device, the lifting device moves the automatic adjustment balance sling for lifting to the top of the transport vehicle, lowers the automatic adjustment balance sling for lifting, stops when lowered to a certain height, the rigging for tying the bamboo poles is respectively connected to the hook mechanism, when the lifting device lifts the bamboo pole, the center of gravity may deviate from the lifting line and cause the supporting main beam to tilt, when the supporting main beam tilts, the slider in the sliding groove on one side slides along the sliding groove to approach the sensor, when the slider and the sensor are close to a preset distance, the control driving mechanism drives the transmission frame to move in the corresponding direction to adjust the balance of the supporting main beam; when the supporting main beam is horizontal, the slider moves away from the sensor under the action of the elastic member, and the driving mechanism stops working. The automatic adjustment balance sling for lifting can automatically adjust the balance during lifting, so that the center of gravity of the bamboo pole coincides with the lifting center line of the sling, and the sling and the bamboo pole are ensured to be in a horizontal state.

[0019] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0021] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0022] Figure 1 A schematic diagram of the structure of the automatic-adjusting balancing sling for lifting provided by an embodiment of the utility model is shown;

[0023] Figure 2 A schematic diagram showing the structure of the supporting main beam of the automatic-adjusting balancing sling for lifting provided by an embodiment of the utility model is shown;

[0024] Figure 3 A schematic diagram showing the structure of a transmission frame of a lifting automatic adjustment balancing sling provided by an embodiment of the utility model is shown;

[0025] Figure 4 A schematic diagram showing the structure of a hook mechanism of a lifting automatic adjustment balancing sling provided by an embodiment of the utility model;

[0026] Figure 5 The schematic diagram of the structure of the installation cylinder of the automatic adjusting balancing sling for lifting provided by the embodiment of the utility model is shown.

[0027] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0028] Description of reference numerals:

[0029] 100-lifting automatic adjustment balancing sling, 110-support main beam, 111-sliding groove, 112-sensor, 113-elastic member, 114-sliding block, 115-support plate, 116-sealing plate, 117-mounting beam, 118-sliding groove, 119-limiting hole, 120-abutting wheel, 130-hook mechanism, 131-support frame, 132-roller, 133-hook, 134-mounting cylinder, 135-limiting pin, 136-limiting block, 137-reset spring, 140-driving mechanism, 141-threaded rod, 142-rotation driving assembly, 150-transmission frame, 151-pulley, 152-shackle. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] The utility model will be further described below in conjunction with the accompanying drawings.

[0036] The embodiment of the utility model provides a lifting automatic adjustment balance sling 100, which can automatically adjust the balance during lifting so that the center of gravity of the bamboo pole coincides with the lifting center line of the sling, ensuring that the sling and the bamboo pole are in a horizontal state.

[0037] See also Figure 1 and Figure 2 The lifting automatic adjustment balancing sling 100 provided by the embodiment of the utility model comprises a supporting main beam 110, on which at least two hook mechanisms 130 are installed at intervals along the length direction, and the two hook mechanisms 130 are used to cooperate with each other to lift the objects to be lifted, and a transmission frame 150 is slidably installed on the supporting main beam 110 through a driving mechanism 140, and the driving mechanism 140 can drive the transmission frame 150 to move along the length direction of the supporting main beam 110, and the transmission frame 150 can be connected to the lifting equipment. The two ends of the supporting main beam 110 are respectively provided with sliding grooves 111 extending along the length direction of the supporting main beam 110, and a sensor 112 is installed in the sliding groove 111 at the end close to the supporting main beam 110, and an elastic member 113 is installed in the sliding groove 111 at the end away from the supporting main beam 110. A slider 114 that can slide in the sliding groove 111 is installed on the elastic member 113. When the slider 114 and the sensor 112 approach to a preset distance, the driving mechanism 140 can be controlled to drive the transmission frame 150 to move to adjust the balance of the supporting main beam 110.

[0038] When the bamboo poles need to be unloaded from the transport vehicle, the transmission frame 150 can be connected to the lifting equipment, and the lifting equipment moves the lifting automatic adjusting balancing sling 100 to the top of the transport vehicle, and lowers the lifting automatic adjusting balancing sling 100, and stops when it is lowered to a certain height. The rigging for tying the bamboo poles is respectively connected to the hook mechanism 130. When the lifting equipment lifts the bamboo poles, the center of gravity may deviate from the lifting line and cause the supporting main beam 110 to tilt. When the supporting main beam 110 tilts, the slider 114 in the sliding groove 111 on one side slides along the sliding groove 111 and approaches the sensor 112. When the slider 114 and the sensor 112 are close to a preset distance, the control driving mechanism 140 drives the transmission frame 150 to move in the corresponding direction to adjust the balance of the supporting main beam 110; when the supporting main beam 110 is horizontal, the slider 114 moves away from the sensor 112 under the action of the elastic member 113, and the driving mechanism 140 stops working. The lifting automatic adjustment balancing sling 100 provided by the embodiment of the utility model can automatically adjust the balance during lifting so that the center of gravity of the bamboo pole coincides with the lifting center line of the sling, ensuring that the sling and the bamboo pole are in a horizontal state.

[0039] The lifting automatic adjustment balancing sling 100 provided in the embodiment of the utility model, further, please refer to Figure 1 , Figure 2 and Figure 3 , support plates 115 extending along the length direction of the support main beam 110 are provided on opposite sides of the support main beam 110, and pulleys 151 are provided on opposite sides of the transmission frame 150, and the support plates 115 on both sides are supported and placed on the pulleys 151 on both sides in a one-to-one correspondence. The support plates 115 on both sides are supported and placed on the pulleys 151 on both sides in a one-to-one correspondence, so that the transmission frame 150 can move stably relative to the support main beam 110, and the pulleys 151 exert an upward force on the transmission frame 150, so that the pulleys 151 can provide sufficient upward force on the transmission frame 150.

[0040] The lifting automatic adjustment balancing sling 100 provided in the embodiment of the utility model is specifically referred to in Figure 1, closing plates 116 are installed at both ends of the supporting main beam 110, the driving mechanism 140 includes a threaded rod 141 and a rotation driving assembly 142, the threaded rod 141 can be rotatably arranged between the two closing plates 116, the transmission frame 150 is threadedly matched with the threaded rod 141, and the rotation driving assembly 142 can drive the threaded rod 141 to rotate, so as to drive the transmission frame 150 to move along the length direction of the supporting main beam 110. When the slider 114 in the sliding groove 111 on one side slides along the sliding groove 111 and approaches the sensor 112, when the slider 114 and the sensor 112 are close to a preset distance, the rotation drive component 142 is controlled to drive the threaded rod 141 to rotate clockwise, so that the transmission frame 150 moves along the first direction relative to the supporting main beam 110 to balance the supporting main beam 110; when the slider 114 in the sliding groove 111 on the other side slides along the sliding groove 111 and approaches the sensor 112, when the slider 114 and the sensor 112 are close to a preset distance, the rotation drive component 142 is controlled to drive the threaded rod 141 to rotate counterclockwise, so that the transmission frame 150 moves along the second direction relative to the supporting main beam 110 to balance the supporting main beam 110.

[0041] The lifting automatic adjustment balancing sling 100 provided in the embodiment of the utility model, further, please refer to Figure 1 , a mounting beam 117 is installed on the lower side of the supporting main beam 110, and the mounting beam 117 is arranged parallel to the supporting main beam 110, and two hook mechanisms 130 are slidably installed on the mounting beam 117. Since the length of the bamboo pole is not fixed, the distance between the hook mechanisms 130 is adjusted according to the length of the bamboo pole to be lifted, so as to facilitate the lifting of bamboo poles of different lengths. Specifically, a slide groove 118 is provided on the mounting beam 117, and the hook mechanism 130 includes a support frame 131, and a roller 132 is rotatably installed on the support frame 131, and the roller 132 is limited to slide in the slide groove 118, and a hook 133 is installed on the lower side of the support frame 131. The roller 132 is limited to slide in the slide groove 118, so that the support frame 131 can move stably relative to the mounting beam 117. In this embodiment, both sides of the upper surface and the lower surface of the mounting beam 117 are provided with slide grooves 118 , and four rollers 132 are rotatably mounted on the support frame 131 , and the four rollers 132 are limitedly slid in the slide grooves 118 in a one-to-one corresponding manner.

[0042] The lifting automatic adjustment balancing sling 100 provided in the embodiment of the utility model, further, please refer to Figure 1 , Figure 4 and Figure 5A plurality of limit holes 119 are provided on the mounting beam 117 at intervals along the length direction, a mounting tube 134 is installed on the support frame 131, a limit pin 135 is slidably installed in the mounting tube 134, a limit block 136 is provided on the side wall of the limit pin 135, the limit block 136 is located in the mounting tube 134, a return spring 137 is sleeved on the limit pin 135, and the two ends of the return spring 137 are respectively abutted against the limit block 136 and the top of the mounting tube 134, and the limit pin 135 can be limited in the limit hole 119 under the action of the return spring 137. When it is necessary to move the support frame 131 on the mounting beam 117, overcome the force of the reset spring 137 to pull the limit pin 135 out of the limit hole 119, then move the support frame 131 to a suitable position on the mounting beam 117, release the limit pin 135 so that the limit pin 135 is limited in the limit hole 119 under the action of the reset spring 137, thereby fixing the position of the support frame 131 on the mounting beam 117.

[0043] The lifting automatic adjustment balancing sling 100 provided in the embodiment of the utility model, further, please refer to Figure 2 The slider 114 is rotatably provided with abutment wheels 120 on opposite sides thereof, and the slider 114 rolls against the side wall of the sliding groove 111 through the abutment wheels 120. The slider 114 rolls against the side wall of the sliding groove 111 through the abutment wheels 120, thereby reducing the friction between the slider 114 and the side wall of the sliding groove 111, thereby improving the sliding sensitivity of the slider 114 relative to the sliding groove 111. Figure 1 and Figure 3 A shackle 152 is installed on the transmission frame 150, and the transmission frame 150 can be connected to the lifting equipment through the shackle 152.

[0044] The embodiment of the utility model further provides a balanced lifting device, which includes a lifting device and a lifting automatic adjustment balancing sling 100 provided in any of the above embodiments, and the lifting device is connected to a transmission frame 150. The specific structure of the lifting automatic adjustment balancing sling 100 refers to the above embodiments, and since the lifting automatic adjustment balancing sling 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0046] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments, and other arrangements may be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in a manner different from that described in the original claims. It may also be understood that the features described in conjunction with the individual embodiments may be used in other described embodiments.

Claims

1. A lifting automatic adjustment balancing sling, characterized in that: The automatic adjusting balance sling for lifting includes a supporting main beam, at least two hook mechanisms are installed on the supporting main beam at intervals along the length direction, the two hook mechanisms are used to cooperate with each other to lift the objects to be lifted, a transmission frame is slidably installed on the supporting main beam through a driving mechanism, the driving mechanism can drive the transmission frame to move along the length direction of the supporting main beam, the transmission frame can be connected to the lifting equipment, and the two ends of the supporting main beam are respectively provided with sliding grooves extending along the length direction of the supporting main beam, a sensor is installed in the sliding groove at the end close to the supporting main beam, an elastic member is installed in the sliding groove at the end away from the supporting main beam, a slider that can slide in the sliding groove is installed on the elastic member, and when the slider and the sensor are close to a preset distance, the driving mechanism can be controlled to drive the transmission frame to move to adjust the balance of the supporting main beam.

2. The automatic balancing lifting device according to claim 1, characterized in that: The supporting main beam is provided with supporting plates extending along the length direction of the supporting main beam on opposite sides, and the transmission frame is provided with pulleys on opposite sides. The supporting plates on both sides are supported and placed on the pulleys on both sides in a one-to-one correspondence.

3. The automatic balancing lifting device according to claim 1, characterized in that: Both ends of the supporting main beam are installed with sealing plates, and the driving mechanism includes a threaded rod and a rotation driving assembly. The threaded rod can be rotatably arranged between the two sealing plates, and the transmission frame is threadedly matched with the threaded rod. The rotation driving assembly can drive the threaded rod to rotate, so as to drive the transmission frame to move along the length direction of the supporting main beam.

4. The automatic balancing lifting device according to claim 1, characterized in that: A mounting beam is installed on the lower side of the supporting main beam, the mounting beam is arranged parallel to the supporting main beam, and the two hook mechanisms are both slidably installed on the mounting beam.

5. The automatic balancing lifting device according to claim 4 is characterized in that: A slide groove is provided on the mounting beam, and the hook mechanism comprises a support frame, on which a roller is rotatably mounted, and the roller is limitedly slid in the slide groove, and a hook is mounted on the lower side of the support frame.

6. The automatic balancing lifting device according to claim 5, characterized in that: A plurality of limit holes are provided on the mounting beam at intervals along the length direction, a mounting tube is installed on the support frame, a limit pin is slidably installed in the mounting tube, a limit block is provided on the side wall of the limit pin, the limit block is located in the mounting tube, a return spring is sleeved on the limit pin, two ends of the return spring are respectively abutted against the limit block and the top of the mounting tube, and the limit pin can be limited in the limit hole under the action of the return spring.

7. The automatic balancing lifting device according to claim 5, characterized in that: The upper surface and both sides of the lower surface of the mounting beam are provided with the sliding grooves, and the four rollers are rotatably mounted on the support frame, and the four rollers are limitedly slid in the sliding grooves in a one-to-one correspondence.

8. The automatic-adjusting balancing sling for lifting according to claim 1, characterized in that: Abutment wheels are rotatably mounted on opposite sides of the sliding block, and the sliding block rolls against the side wall of the sliding groove through the abutment wheels.

9. The automatic balancing lifting device according to claim 1, characterized in that: A shackle is installed on the transmission frame, and the transmission frame can be connected to the lifting equipment through the shackle.

10. A balanced lifting device, characterized in that: The balanced lifting equipment comprises a lifting device and an automatically adjustable balancing lifting device as claimed in any one of claims 1 to 9, wherein the lifting device is connected to the transmission frame.

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